Seabob (Germany):

Flagship F5 Pro, top speed 10km/h (5.4 knots), 60-minute battery life, weighs 30kg, uses brushless motor + dual-jet technology, supports deep diving to 40 meters, suitable for advanced players;

Added pressure-sensitive control, automatically adjusts thrust to adapt to water flow.

Dive Xtras (USA):

Cuda 3.0 features lightweight design, only 25kg, extended battery life to 90 minutes (7 knots), modular battery compartment supports hot-swapping, compatible with O2 monitoring interfaces, designed for technical diving, low maintenance cost.

Sublue (China):

WhiteShark Mix 2025 version, with smart APP, supports remote speed control (0-6.5 knots), 80-minute battery life, built-in LED fill light, max depth 30 meters, suitable for families or beginners, supports Type-C fast charging.

TUSA (Japan):

Jetpack Hybrid, focuses on safety, uses Lithium Iron Phosphate battery, 120-minute battery life (5.5 knots), weighs 22kg, anti-leakage design, compatible with all TUSA masks/snorkels, suitable for recreational diving.

YAMAHA (Japan):

Marine Scooter XU, relies on engine technology, top speed 7.5 knots, 70-minute battery life, weighs 32kg, dual propellers for anti-turbulence, max depth 60 meters, commonly used by professional dive teams, wide after-sales network coverage.

Seabob

Seabob is a German professional underwater propeller brand, with a 37% user penetration rate in professional diving scenarios, serving over 50,000 divers, covering tasks such as 40-60 meter deep dives and 8km/h high-speed tracking.

Brushless motor efficiency is 30% higher than traditional brushed models, underwater operating noise is below 50 decibels;

Modular lithium battery has a single block capacity of 1.8kWh, 90-minute battery life (economy mode), passed IP68 waterproof certification and BMS (Battery Management System).

Power and Battery Life

Battery Stability

A single Seabob battery pack consists of 250 18650 cells in series, capacity 7.2V/250Ah, which converts to the common unit of 1.8kWh——enough to run an F7s in economy mode (5km/h) for 90 minutes in 20°C water temperature and gentle currents (1 knot).

But in actual diving, speed, depth, and water temperature will all affect power consumption:

Usage Scenario	Power Consumption (per 10 minutes)	Remaining Battery (based on 90-minute endurance)
Economy Mode (5km/h)	8%	90% used in 90 minutes
High-Speed Mode (8km/h)	18%	162% used in 90 minutes (exceeds battery life)
40m Deep Dive (anti-pressure)	12%	108% used in 90 minutes

The Battery Management System (BMS) can monitor individual cell voltage every 0.1 seconds. When a cell's voltage is below 3.6V (over-discharge threshold) or above 4.2V (over-charge threshold), it immediately cuts off power to that cell and alarms.

Lab cycle tests show that this system allows the battery to retain 85% capacity after 500 full charge/discharge cycles (industry average is about 70%).

Actual Diving

A cameraman from a marine documentary team shared:

When filming schools of coral fish, he often uses economy mode (5km/h) to follow them, and a single battery can support 2 hours of filming;

When encountering shots that require rapid movement (like tracking sea turtles), switching to high-speed mode (8km/h) consumes 60% of the battery in 30 minutes, with the remaining power still sufficient to return to the surface.

In 15°C seawater, lithium battery activity decreases, and battery life will be shortened by 15%-20%.

Seabob optimized the battery's insulation layer for this, using aerogel material to wrap the cells. Tests show that in a 10°C environment, the battery life is only 10% less than at 20°C (dropping from 90 minutes to 81 minutes), which is much more stable than competitors without insulation (which shorten by 30%).

Although the brushless motor avoids carbon brush maintenance, the diver's manual recommends checking the propeller for marine life attachment (like barnacles) every 50 hours. After cleaning, power output can be restored to 95%;

Replace the O-ring seal every 200 hours (cost about 20 USD) to prevent seawater from seeping into the motor cavity and causing a short circuit.

Some users have recorded that an F7s, strictly maintained according to the schedule, showed only a 2% decrease in motor efficiency after 3 years of use.

Matching Needs

“Customized” Propellers?

Seabob's R&D team conducted a user needs survey:

Among 2000 divers, 65% mentioned "existing equipment is either too heavy or not powerful enough"; 30% hoped "one machine could cover multiple scenarios."

Needs Breakdown:

• Recreational Diving (60%): Concerned with weight (＜20kg), simple operation, storage capacity;
• Professional Diving (30%): Value depth (＞50 meters), power (＞7km/h), equipment expandability;
• Commercial Use (10%): Need compatibility with camera equipment, long battery life (＞90 minutes).

Cayago and F7/F7s

Seabob's current main product line has only two series, yet they precisely cover 90% of diving scenarios:

1. Cayago Series

• Weight and Portability: 18kg empty weight, 2-3kg lighter than similar recreational propellers (e.g., Sublue WhiteShark Mix weighs 21kg). The body is 1.1 meters long, can fit in a car trunk or dive center locker. User feedback: "Easy to carry to the beach by one person."
• Depth and Speed: Maximum dive depth of 40 meters (meeting 90% of recreational diving needs, the average depth of global popular dive sites like the Great Barrier Reef is 30 meters), maximum speed of 5km/h (about 2.7 knots), suitable for slow-paced sightseeing.
• Additional Features: Comes with a waterproof storage bag (10L capacity), can hold a GoPro, dive computer; non-slip pad design at the bottom makes it less likely to slide when resting in coral reef areas.

2. F7/F7s Series

• Depth and Pressure Resistance: F7s maximum depth 60 meters (covering cave diving, wreck exploration, etc.), shell uses an aerospace-grade aluminum alloy frame, no deformation observed in lab tests simulating 60-meter water pressure.
• Power and Control: Peak power 1.2kW, high-speed mode 8km/h (about 4.3 knots), can counter 2-3 knot currents (like in parts of the Red Sea). Cave divers report "it's 30% more stable when turning in narrow passages than the models I used before."
• Expandability: Standard 1200-lumen LED light (1500 lumens illumination at 5 meters underwater, meeting filming needs), side-mounted camera bracket compatible with mainstream devices like GoPro 11/Insta360 X3. A marine documentary team used the F7s to film coral spawning, operating underwater continuously for 3 hours with no equipment failure.

How Users Choose?

• People who choose Cayago say: "I go shallow sea snorkeling every week, bringing a GoPro to film small fish. The Cayago is light, the storage bag fits the camera perfectly, and the 60-minute battery life is enough for 3 sessions. No need to buy a more expensive one."
• People who choose F7s say: "I'm a cave diving instructor, I need to take students down to 50 meters and also film instructional videos. The F7s's stabilization system and camera mount are essential. It's more expensive, but gives peace of mind."

The Cayago series is positioned for shallow sea sightseeing, weighs 18kg, max depth 40 meters, speed 5km/h, with annual sales exceeding 3000 units;

The F7/F7s series targets professional diving, the F7s weighs 22kg, max depth 60 meters, speed 8km/h, suitable for cave exploration, underwater photography.

User surveys show that 82% of recreational divers choose Cayago, and 75% of professional users choose F7s.

Real Reviews

What Divers on Forums Say

Scubaboard, as the world's largest diving community, had over 21,000 discussions about Seabob in 2024:

Frequent Praise Points (Mention rate > 40%):

• Power Response: "Plenty of thrust, almost zero delay when tracking fast-swimming dolphins, much smoother than the JetAviator I used before";
• Solid Battery Life: "In economy mode, the 90-minute battery life is enough for me to do two 40-meter coral reef dives without recharging in between";
• Durability: "Used it for 3 years, the motor hasn't degraded, and after cleaning the propeller, the power is restored to 95%."

Main Points of Contention (Mention rate < 15%):

• Weight: "The 22kg F7s needs help to carry to the pier, not as portable as Sublue";
• Price: "The F7s is about 10,000 USD, which is 2000-3000 USD more expensive than competitors in the same class."

Long-term user feedback indicates that motor efficiency drops by only 2% after 3 years of use, and the repair rate is 15% lower than the industry average.

Test Data

Two authoritative diving media outlets conducted a horizontal comparison test:

Test Item	Seabob F7s	Competitor JetAviator Pro	Result Difference
40m deep dive posture stability	Posture deviation ＜5°	Deviation 8°	Seabob 37% more stable against currents
Low-temperature environment battery life	78 minutes runtime in 10°C seawater	70 minutes	Seabob has 11% more low-temp runtime
Equipment expansion compatibility	Supports 3 types of camera mounts	Only supports 2 types	Seabob adapts to more filming needs

Professional review agency Diver Magazine rated it 4.7/5, highlighting its stabilization system (posture deviation < 5° in cave diving)

Several divers who have used it for over 3 years shared their real experiences:

• Mark, Cave Diving Instructor (5 years of use): "I take students into 50-meter caves 30 times a year, and the F7s's dynamic stabilization system has never made me panic. The only maintenance is changing the O-ring every 200 hours, which is low cost."
• Sarah, Marine Photographer (4 years of use): "The F7s's LED light is bright enough underwater, I don't need extra lighting when filming coral spawning. The battery is still at 82% of its original capacity after 4 years."

Their common feedback: "In 5 years, it's only been sent for repair once, and that was because the propeller hit a rock."

Dive Xtras

Dive Xtras' product Seawing Nova uses a HydroBrushless motor (92% efficiency, 40-45dB underwater noise), with flexible arms fixed to the BCD side, and the thruster head is adjustable from 0° to 30°. Beginners can master balance in 30 minutes.

The Jetpack series weighs 8.5kg (including battery), has 25kgf of thrust, and supports reverse travel.

The battery uses a "Swap & Go" system, a single 560Wh battery lasts 2-3 hours, and can be replaced within 5 minutes.

User feedback: No failures during 5 hours of continuous work at a 60-meter depth. Photographers say the brushless motor reduces biological disturbance.

Performance Breakthroughs

Motor

Dive Xtras' HydroBrushless motor has a 7 percentage point increase in efficiency compared to the industry-standard brushed motors—meaning with the same 560Wh battery, the Seawing Nova can travel an extra 1.2 kilometers (at 25kgf thrust).

When operating underwater, the noise level is stable at 40-45dB (equivalent to a diver's breathing sound up close), which is over 25dB lower than traditional motors.

In 2024, a coral research team in the Florida Keys used it to track schools of surgeonfish and found the fish's avoidance reaction to the device was reduced by 60%.

Battery

To address the diver's biggest headache of "not enough battery," Dive Xtras made two designs:

• High-capacity single battery: 560Wh lithium battery, supporting the Seawing Nova to run continuously for 2.5 hours at 25kgf thrust, enough to dive from the surface to 60 meters deep and return (a round trip of about 1.8 kilometers).
• Swap & Go Quick-Change System: The battery is fixed via a quick-release interface on the back. Users can swap in a spare battery within 5 minutes without surfacing. The commercial diving company OceanTech tested this: with old equipment, they could only inspect 5 km of 100-meter deep seabed pipelines per day; after switching to Dive Xtras, they can inspect an additional 2 km per day, a 40% increase in efficiency.

Structure

Dive Xtras' design philosophy is "reduce the diver's extra movements," which is specific to its two main models:

• Seawing Nova: Fixed to the BCD side with flexible arms, no need to hold it. The thruster head can be tilted 0°-30°—tilt it up to ascend, pull it back to descend. Beginners practicing can achieve a stable hover at 10 meters deep within 30 minutes, without having to "clutch the machine to adjust balance" as before.
• Jetpack Series: Designed for freediving, total weight 8.5kg (including battery), 30% lighter than similar products. Thrust up to 25kgf, supports reverse travel and 360° rotation—freediving photographers use it to film clownfish in coral, allowing precise hovering within 5cm, 3 times more stable than previous equipment.

In statistics from the international diving forum Scubaboard, Dive Xtras users' "equipment reliability rating" reached 4.8/5 (out of 5):

• Technical diver @DeepDive_EU: During a 60-meter deep dive in Norway in 2024, the equipment worked continuously for 5 hours without failure, with 18% battery remaining.
• Marine conservation organization Oceana: Used Seawing Nova for coral reef monitoring. Over one year, equipment failures were 80% less than before—"No need to stop midway to fix the machine, we can complete the full area scan."

Dive Xtras' performance breakthrough lies in the HydroBrushless motor's 92% efficiency (industry average 85%), underwater noise 40-45dB (traditional brushed motor 70dB);

Swap & Go battery, single 560Wh, 2-3 hours runtime, 5-minute quick-change;

Seawing Nova flexible arm fixation + adjustable thruster head, beginners master balance in 30 minutes.

User Feedback

Technical Divers

Mikael, a technical diver from Trondheim, Norway, has been using Dive Xtras' Tech Pro model since 2022, making over 50 dives a year, with his deepest reaching 100 meters.

"I've used other brands before, and the motor would easily overheat and shut down below 60 meters," he posted on a forum. "The Tech Pro's temperature control system allowed me to work continuously for 5 hours in the cold waters of the Norwegian fjords, and the battery temperature never exceeded 45°C.

"In 2024, he and his team mapped a 19th-century iron-hulled shipwreck, and the equipment didn't fail once."

Another technical diver, Sarah, who frequently visits the Bahamas, uses the Seawing Nova for cave diving:

"The flexible arm fixation is very stable. When the current hits, I don't need to grab the machine with my hands, freeing them up to adjust my BCD buoyancy. Last time I was filming coral in a 30-meter deep blue hole, the camera didn't shake, and the usable shot rate was 20% higher than before."

Underwater Photographers

Liam, a freediving photographer at the Great Barrier Reef in Australia, switched to the Dive Xtras Seawing Nova in 2023.

He compared his filming data from two years:

After switching to Dive Xtras, the effective filming time for schools of surgeonfish increased from 12 minutes to 25 minutes per dive.

Mia, another American photographer who often shoots macro, uses the Jetpack series for close-up shots:

"The 25kgf thrust is stable enough. Hovering 5cm above the coral, the camera doesn't shake with the machine. With my old equipment, I had to constantly make micro-adjustments. Now I can focus on composition, and my rejection rate has dropped by 35%."

Commercial Dive Teams

OceanTech, a marine engineering company in Florida, USA, responsible for subsea pipeline inspection, purchased 10 Dive Xtras Jetpacks in 2024.

"With the old equipment, we could inspect 5 km of pipeline per day. After switching to the Jetpack, we can check an additional 2 km."

Project manager Dave shared at an industry conference, "The quick-change battery saves time. We don't have to surface to change batteries every time, allowing us to work an extra 1.5 hours a day."

They conducted a failure statistic:

The old model averaged 12 failures per year (mostly motor carbon brush wear), while the Jetpack has only broken down once in 10 months, and that was due to a loose connector caused by user error.

"Maintenance costs are down by 40%, which is equivalent to saving 8000 USD per year."

Tom, a dive instructor in Vancouver, Canada, often uses the Dive Xtras Jetpack for teaching beginners.

"The students don't need to learn how to hold the machine; just clip on the flexible arm," he said. "It used to take half an hour to teach balance; now I can get a beginner to hover stably in 10 minutes."

Sublue

Sublue's WhiteShark Mix supports magnetic quick-release batteries, allowing a one-handed battery swap in 3 seconds, solving the problem of frequent charging in shallow seas;

The one-touch start function reduces the learning time for beginners from 45 minutes to 15 minutes (2023 Dive Gear field test).

The flagship Pro 3 is equipped with the "Bluefin" battery. After 2 hours of 60-meter deep diving, the temperature rise is only 3.2°C (industry average 8-10°C), with a 90-minute battery life in economy mode.

The 2025 model comes with the "Sublue Dive" APP, displaying depth and water temperature in real-time, and can link with a GoPro to automatically maintain a 1.5-meter lateral distance for follow-cam shots.

Technical Advantages

Power

The model is equipped with a self-developed "Dolphin X" brushless motor, with a measured operating noise of ≤55 decibels (close to ambient ocean noise).

In terms of power output, the 500W version has a maximum thrust of 28kg, speed 2.5m/s (about 9km/h), meeting needs from shallow sea cruising to medium-depth diving.

The motor head can be replaced separately, making maintenance costs 40% lower than integrated models (2024 third-party maintenance cost survey data).

 Battery Life

Sublue collaborated with leading international cell manufacturers to develop the "Bluefin" battery pack, using 18650 cylindrical cells, paired with a double-layer thermal insulation film + smart BMS (Battery Management System).

• After 2 hours of continuous operation (60m depth), 38% battery remains;
• In low-temperature (-2°C) environments, capacity retention rate is 92% (industry average 85%);
• Supports "plug-and-play" swapping, a single battery provides 90 minutes of runtime in economy mode, solving the hassle of mid-dive charging.

Auxiliary Systems

The 2025 model comes standard with the "Sublue Dive" APP (compatible with iOS 15+, Android 12+), turning data into part of the operation:

• Real-time monitoring: Depth, remaining battery, water temperature are displayed synchronously on the phone screen, no need to look down at the gauge;
• Mode customization: Eco mode reduces thrust by 20%, suitable for long-term coral observation; Sport mode increases response speed, suitable for rapid movement;
• Follow-cam linkage: Pairs with GoPro Hero 12 and newer models. The propeller uses sensors to maintain a 1.5-meter lateral distance, automatically following the diver—87% of professional divers reported that this feature improved underwater filming efficiency (2024 Dive Community user survey).

Sublue's "Dolphin X" motor's bionic blades reduce noise to 55 decibels, 500W version provides 28kg of thrust;

"Bluefin" battery uses custom 18650 cells, temperature rise after 2 hours at 60m depth is 3.2°C (industry average 8-10°C);

2025 model APP supports GoPro linkage, automatically maintaining a 1.5-meter follow-cam distance.

User-Centric Design

WhiteShark Mix

Sublue's WhiteShark Mix weighs only 4.2 kilograms (including battery), not much heavier than a 2-liter bottle of soda.

The operation is designed to be "foolproof": just press a button to turn it on, no need to remember any "mode switching keys";

In 2024, they tested it with 50 beginners who had never used a propeller before. 92% of them learned the basic operations within 15 minutes, three times faster than the industry average of 45 minutes.

The battery is attached to the bottom of the body magnetically. You can pull it off with one hand and push it back into the slot, the whole process takes less than 3 seconds.

One battery lasts 60 minutes in economy mode, enough for a beginner to play for two or three rounds at the beach.

The price is also friendly, under 4000 (RMB/unit not specified), 15%-20% cheaper than competing products in its class.

WhiteShark Pro 3

The WhiteShark Pro 3 can dive to a maximum of 100 meters, which is deep enough for most dive sites.

The battery life is upgraded to 90 minutes in economy mode. The most practical feature is the "equipment expansion" function:

There are reserved holes for a dedicated GoPro mount on the body, no need to buy extra adapters, just tighten a screw to secure it;

There are also LED light slots on the side. Install two fill lights, and the colors in the photos will be more accurate.

Its motor is an enhanced 500W version. In high-speed mode, it can reach 2.5 meters per second (about 9 km/h), allowing it to maintain direction even in strong currents.

Seabow S1

The Seabow S1 uses a carbon fiber body, bringing the weight down to 3.1 kilograms.

Thanks to its streamlined design, it has 18% less drag than ordinary propellers at the same speed, making it more effortless to glide.

In 2024, 20 freediving instructors tested it, and 81% said, "After using the S1, the physical exertion for descending to 30 meters was significantly less than before."

One instructor shared:

"When I used to train students in breath-hold diving, I always worried they wouldn't have enough stamina. Now with the S1, students can focus more on their breathing training and progress faster."

It has a maximum depth of 60 meters, enough for most freediving scenarios, and its price is slightly lower than the Pro 3, making it a "word-of-mouth favorite" in the freediving community.

92% of beginners believe the one-touch start + magnetic battery swap lowers the learning curve; 87% of advanced divers recognize the deep-diving stability of the WhiteShark Pro 3; 81% of freedivers mentioned the Seabow S1's breathing synchronization feature saves stamina.

TUSA

TUSA's main model, Power Jet Pro, weighs 4.1kg (including battery), has a thrust of 22kgf, a top speed of 6.5km/h, and its 48V lithium battery provides 90 minutes of runtime——in a 30m deep dive test, power decay was only 8% (industry average 15%).

In terms of operation, the Pro version supports “Depth Adaptive Mode”:

A built-in pressure sensor monitors water pressure every 5 seconds, automatically adjusting motor power to prevent power loss at high pressure.

The Lite version is only 3.2kg, with a quick-release buckle for 30-second BCD mounting, 3-speed adjustment (1.2/1.8/2.4m/s), suitable for snorkeling.

User Field Test:

Used in Tubbataha Reefs, Philippines, the anti-tangle propeller design reduced debris interference by 80%, and after the low battery (15%) alarm, it could still run for 12 minutes to return.

"Durability" and "Stability"

Material Corrosion Resistance

TUSA's propeller shells use a custom ABS + nylon composite material—30% harder than ordinary plastic, 20% lighter than metal—while components (motor interfaces, sealing rings) are made of anodized aluminum alloy or titanium alloy.

To verify corrosion resistance, TUSA conducted rigorous tests:

Samples were immersed in a 3.5% sodium chloride solution (simulating tropical seawater) for 500 hours. The results showed a surface corrosion rate of <0.1%—which is 3 times stricter than the common industry standard of 0.3%.

The titanium alloy sealing rings are more "pressure-resistant":

They can withstand 60 bar of pressure (equivalent to diving to 600 meters), so even if left in the sea for long periods, they won't leak or allow water into the motor due to pressure or corrosion.

Fluid Dynamics

TUSA didn't go for a radical appearance. Instead, they placed the motor at the rear and adjusted the curvature of the shroud, controlling underwater propulsion vibrations to within ±0.5° (competitors average ±1.2°).

For example, in the Sac Actun cave system in Mexico (25m depth, passage width < 1m), the Pro version's low center of gravity design allows for turns with almost no contact with the rock walls, avoiding the risk of scratching the equipment or getting stuck.

One diver provided feedback:

"With my previous brand, I'd lag for a moment just to make a turn, afraid of hitting the wall. With TUSA, I don't. It's stable enough to free up my hands to film."

Accident Prevention

TUSA installed two "safety net" systems:

• Low Battery Protection: When the battery is below 15%, it doesn't just suddenly die—it first reduces speed to 1.2m/s, then issues a beep alarm. Tests show there are still 12 minutes of runtime from the alarm to complete shutdown. For example, when diving in Palau, the alarm went off at 12% battery. Following the prompt to return, I made it back to the boat, no need to panic and find a shortcut.
• Propeller Anti-Tangle: The blade spacing is 1.5 times wider than the blade width of standard models. Even if it gets tangled in seaweed or fishing nets, you can dislodge it by lightly pushing the blades after powering off.

One user tried it at the Great Barrier Reef. The propeller got tangled in half a meter of seaweed, but they cleared it in two tries without dismantling the propeller or delaying the rest of the dive.

Professional and Recreational

Technical Diving

The Power Jet Pro weighs 4.1kg (including battery), 0.3kg lighter than competitors in its class. In the Sac Actun cave system in Mexico (25m depth, 1.2m passage width), divers need to turn frequently. Being 0.3kg lighter means less arm strain and more flexible operation.

The Pro version's depth-adaptive mode has a built-in pressure sensor that measures water pressure every 5 seconds, automatically adjusting motor power.

Tests show that at a 35-meter depth, power output is only 8% lower than at the surface (industry average drop is 15%).

The shell is made of a custom ABS + nylon composite material, 30% harder than ordinary engineering plastics.

An instructor with 12 years of experience said:

"I've been cave diving with the Pro version for 3 years, the shell hasn't gotten a single scratch, and not one screw has come loose."

The 90-minute battery life is sufficient to complete a medium-length cave exploration (which usually takes 60-75 minutes).

Snorkeling Beginners

The Lite version's 3.2kg weight (including battery) adds almost no extra load when clipped to a BCD.

The quick-release buckle allows for mounting in 30 seconds, and the 3-speed adjustment (1.2/1.8/2.4m/s) is very practical:

Use the 2nd gear to keep distance from fish schools, switch to 1st gear for macro shots of coral, and switch to 1.2m/s to drift slowly when tired.

Feedback from a snorkeler at the Great Barrier Reef, Australia:

"This was my first time using a propeller, and choosing the Lite version was the right decision. I was afraid I wouldn't be able to learn, but the instructor taught me for 5 minutes, and I could control the speed myself. The 3-speed adjustment is very smooth; it doesn't suddenly dash forward and scare the fish."

It uses a 36V lithium battery with a 60-minute runtime—snorkeling sessions are typically 20-30 minutes, so one charge can last two or three times.

Two Adaptations

Differences between the Pro and Lite versions:

Need Point	Power Jet Pro	Power Jet Lite
Operational Complexity	Requires adapting to depth-adaptive mode	Quick-release + 3-speed adjustment, 5 minutes to learn
Environmental Adaptability	30m+ deep diving, narrow spaces (caves/wrecks)	5-30m shallow sea, open water sightseeing
Maintenance Cost	Annual maintenance ~500 (RMB) (replace seals)	Annual maintenance ~200 (RMB) (rinse propeller)
User Profile	Technical divers, long-distance explorers	Snorkeling beginners, family diving groups

In the Similan Islands, Thailand, technical diver Mark completed a 45-meter wreck exploration with the Pro version:

"I set the depth adaptation before descending. When I reached 30 meters, I clearly felt the motor power adjust; the thrust didn't weaken. On the return, the battery was at 18%. The alarm was quiet, I didn't panic, and slowly swam back to the boat as prompted."

User Field Tests

Professional Divers

Carlos, a cave diving instructor in Mexico, has used the Power Jet Pro for 3 years, averaging 80 dives per year. His feedback is straightforward:

"The shell has never rusted, and the screws have never loosened. When turning in the Sac Actun cave (25m depth, narrow passages), the low center of gravity design has never scraped the rock wall. The depth-adaptive mode at 35 meters only loses 8% power—my previous brand would drop 15%, forcing me to constantly readjust my posture."

Mike, another wreck explorer who often visits Palau, added:

"The Pro's Bluetooth connection to my dive computer is very practical; I can see the battery level and depth on the screen. Last time I dived to 40 meters, the alarm went off at 15% battery. It took me 12 minutes to return as prompted, surfacing safely. In three years, I've only replaced the seal ring once, which cost 300 (RMB), cheaper than I expected."

Recreational Divers

Lila, a snorkeler at the Great Barrier Reef, Australia, used a propeller for the first time:

"The instructor taught me for 5 minutes, and I learned how to use the 3-speed adjustment—2nd gear for fish schools, 1st gear for coral photos, and 1.2m/s to drift slowly when tired. It only weighs 3.2kg, I barely felt it on my BCD."

Sarah, a family diver in Florida, USA, uses the Lite version with her child:

"My 12-year-old child can install the machine and adjust the speed all by himself, and he didn't complain about being tired the whole time. The battery lasts 60 minutes. We usually dive for 20 minutes at a time, so one charge lasts us three times."

A Reddit user survey showed that 85% of Lite version users cited "simple operation" as the main reason for their choice, and 72% mentioned that "easy maintenance" increased their frequency of use.

Three-Year Usage

TUSA's durability stands the test of time:

• Failure Frequency: The Power Jet Pro has a 3-year cumulative failure rate of <5% (industry average is ~12%). Issues are mainly minor propeller wear (replacement cost < 200 RMB); the Lite version's 3-year failure rate is near 0, with only a few users reporting seal aging (replaced for free).
• Performance Retention: After 3 years of use, the Pro version's power decay at 30m depth is still controlled within 10% (new machine standard is 8%); the Lite version's battery life only decreased by 5% (from 60 minutes to 57 minutes).
• Maintenance Cost: Professional users spend about 500 (RMB) annually on maintenance (replacing seals, rinsing the motor); recreational users spend about 200 (RMB) annually (rinsing the propeller, checking the battery).

On international diving forums like Scubaboard and Reddit/r/scuba, over 200 users have shared their real experiences with TUSA propellers:

Power Jet Pro 3-year failure rate <5%, Lite version user satisfaction 92%;

Cave divers mention only 8% power decay at 30m depth, snorkelers praise the 3-speed adjustment as "learned in 5 minutes";

Low maintenance cost, average parts replacement time at domestic dive centers is 4 hours.

YAMAHA

YAMAHA's F-12 recreational model weighs 7.8kg (industry average 9.5kg), folds down to just 0.2m³, and can be carried in a backpack;

Equipped with a custom brushless motor, speed control is precise to ±1%, with 0-2.5 knots variable speed. Beginners can start and stop with a single-handed grip.

The X-20 professional model has dual motors in parallel, maximum speed 5 knots (about 9.2km/h), and can still maintain a stable 3-knot thrust with a 10kg payload;

The body is covered with aerospace aluminum + nano-ceramic coating. It has been field-tested at 60m depth (30m is sufficient for recreational diving), and components showed zero rust after 500 hours of salt spray testing.

The battery uses an electric motorcycle BMS system, with a 92% battery life retention rate in low-temperature environments (competitor average 85%).

Precise Adaptation

Motor Technology

The brushless DC motor in YAMAHA's underwater propellers is prototyped from components of motorcycles and marine engines:

• Speed Control: Land engines need to cope with complex road conditions (like rapid acceleration on a motorcycle), requiring fast speed response but low fluctuation. Ported to underwater use, the team tightened the speed fluctuation range from ±2% (land) to ±1%. At low speed (0.5 knots), the propeller's thrust variation is less than 0.1kgf, preventing divers from losing balance due to sudden acceleration.
• Torque Output: Marine engines often need to tow heavy objects (like lifeboats), so their low-speed torque is already stronger than ordinary motors. YAMAHA further optimized the magnetic circuit design, making the underwater motor's torque output deviation less than 2% in the 0-2.5 knot range (industry average 5%), resulting in a smoother start in shallow water.

Waterproofing and Anti-Corrosion

YAMAHA adopted the sealing standards of its marine engines:

• Body Structure: Uses an aerospace-grade aluminum alloy frame (1.5 times the strength of ordinary aluminum alloy), covered with a nano-ceramic coating. Third-party tests show that after 500 hours of immersion in 3.5% salinity seawater at a 60m depth (simulating extreme diving scenarios), the electronic control modules and interfaces showed no traces of rust (industry average tolerance is 40m depth, 300 hours).
• Seal Selection: The O-rings use fluoro-rubber material, the same type used in the underwater transmission systems of yacht engines. The temperature resistance ranges from -2°C to 40°C (covering the water temperature of most global dive sites), and aging tests show a compression deformation rate of <5% after 5000 hours (ordinary rubber rings are about 15%).

Underwater Optimization of BMS

YAMAHA adapted its BMS (Battery Management System) from electric motorcycles:

Function Module	Land (E-Motorcycle) Need	Underwater (Propeller) Adjustment	Actual Effect
Temperature Monitoring	Prevent high-temp overcharge (alarm above 45°C)	Added low-temp compensation (boost discharge efficiency at 5°C)	92% runtime retention in -5°C (competitor 85%)
Battery Estimation	Learns based on riding habits	Added depth compensation algorithm (power drains faster deeper)	Runtime error <3% at 30m depth (vs. ~8% w/o)
Fault Protection	Over-current/short-circuit power cutoff	Added water immersion auto-cutoff (stops supply if water detected)	Avoids short-circuit risk from shell breach

YAMAHA precisely migrated 58 years of land engine technology to its underwater propellers:

The custom brushless motor, born from marine engines, has a speed control accuracy of ±1% (industry ±3%-5%);

The body uses aerospace-grade aluminum + nano-ceramic coating, with zero component rust after 500 hours of salt spray testing;

The battery system borrows from electric motorcycle BMS, achieving 92% runtime retention at low temperatures (5°C) (competitor 85%).

Two Models

F-12

The F-12 weighs 7.8 kilograms (including battery), and its folded volume is only 0.2 cubic meters, fitting perfectly into the side pocket of a 20-liter backpack.

It uses a single custom brushless motor with an output power of 120 watts.

At a slow cruise of 0.5 knots, the thrust is stable at 0.3kgf (kilogram-force), 15% higher than the industry average.

The battery life is more practical:

A 72-watt-hour lithium battery provides 90 minutes of runtime at a constant 2.5 knots.

Field test data is more specific:

In 25°C water temperature at a 20-meter depth, after 30 minutes of continuous filming of coral reefs, the remaining battery could still support another 40 minutes of cruising.

The tail shroud mimics the fin curvature of a mackerel. Fluid dynamics lab tests showed it reduces water turbulence by 40% compared to traditional propellers.

Pro Diver X-20

The F-12's 12.5-kilogram weight (including battery) looks heavy, but its dual-motor parallel design allows it to maintain a stable 3-knot propulsion even when carrying a 10-kilogram payload (like a dive computer and spare lights).

It has a 2-inch LED screen on top, displaying three pieces of information in real-time:

Current depth (error < 2%), body tilt angle (error < 2°), and remaining battery percentage.

For example:

When a technical diver descends to 40 meters, the screen will display "Depth 40m, Angle -5°"—the negative sign indicates a slight head-down tilt, possibly checking if their fins are hitting the bottom. At this point, they can adjust their body posture to avoid losing balance and hitting rocks.

The body frame uses aerospace-grade aluminum, with a tensile strength of 500 MPa (ordinary aluminum alloy is ~300 MPa), equivalent to withstanding 500 kilograms of pulling force.

The outer nano-ceramic coating underwent a simulated fishing net abrasion test:

Using a 2mm diameter nylon rope, rubbed at 5 m/s 50 times, the coating did not peel, and the underlying metal was unscratched.

The battery protection is also enhanced: IP68 waterproof rating, it can still supply power normally after 30 minutes of immersion at a 50-meter depth.

In the first half of 2025, the F-12 ranked third in family diving equipment sales (18% market share), while the X-20 ranked second in professional diving equipment (22% market share).

User Reviews

Stability

In 200 valid questionnaires from Scubaboard in Q1 2025, 73% of users explicitly stated, "The equipment has never experienced a power interruption during a dive."

• Long Dives in Cold Water: A diver from Trondheim, Norway, reported using it continuously for 4 hours (conventional promotion is 3 hours) in 5°C water at 28m depth. The propeller speed remained stable at 2.2 knots, with no sudden battery drop or motor stuttering due to the cold.
• Operation in Coral Reefs: A diver in Anilao, Philippines, mentioned, "With my old brand propeller, scraping the shell while squeezing through coral gaps would trigger a short circuit; YAMAHA's nano-coating is scratch-resistant, and the power never cut out."

Third-party lab simulations also corroborate this:

After 500 hours of continuous operation at 30m depth and 3.5% salinity, the motor output power decay was only 1.2% (industry standard allows ≤3%).

After-Sales Service

A 2024 user interview from Diveboard showed:

• Service Center Coverage: 82% of users stated "there is an authorized service center within 50 km of my dive site," far exceeding the industry average of 55%.
• Parts Supply Speed: 91% of users confirmed "receiving parts within 48 hours of reporting a fault."

Weight and Price

A small amount of negative feedback also exists, focused on:

• X-20 Weight: 12.5 kg (including battery) was considered "a bit cumbersome after mounting gear" by some technical divers, but 90% of users accepted "compromising for durability."
• Price: The F-12 is priced at 899 USD (industry average 750 USD). Users felt "the higher price is for the low failure rate, making it more cost-effective in the long run."

2024-2025 global diving community surveys show YAMAHA underwater propeller user satisfaction at 89% (Scubaboard data). Over 70% of users mentioned 4 hours of failure-free operation in 30m deep cold water, 82% praised the 48-hour parts response from service centers in 120 countries, and 75% approved of the 55-decibel low noise that doesn't disturb fish.