HexJet Propulsion Hub

This open-source DPV delivers ~1.5 m/s speeds in an 8 lb package using dual T500 thrusters and a folded aluminum frame that costs under $100.

• Frame...

• Venturi-assisted design: Inner nozzle thrust creates suction in the tunnel between nozzles, pulling extra freestream fluid into the outer channel to...

Seacraft's shaftless magnetic motor operates directly in water, removing unreliable seals and transmissions for enhanced reliability.

• Post-swirl...

Toroidal propeller designs reduce tip vortices to lower noise and cavitation in water.

• Blue Robotics sees promise but flags patent licensing,...

Newer personal underwater scooters like the SUBLUE VAPOR Series are adopting enclosed pump-jet propulsion over the guarded propellers found in traditional designs. This marks a clear engineering evolution for compact DPVs.

A hobbyist seeks a Fusion 360 design for an underwater scooter shell built around the Maytech 13 kW water jet kit, emphasizing practical mounting,...

The M2 jet drive delivers high-performance propulsion via water jet, advancing boats forward unlike traditional propeller systems.

• Radially outgassing propeller routes pressurized gas through blades for direct rotation, creating a compact integrated system.
• Replaces electric...

• Oblique inflow significantly amplifies RDT vibration and radiated noise levels
• Journal bearing excitation transfers rotor forces and cannot be...

• Owner needs 48V solid-state brushed controller to replace fried mechanical speed board on lead-acid battery setup
• Community suggests reed-switch...

• Stress reduction at source: Dual ANPC inverters in inverse sync cut neutral-point voltage fluctuations 90% and capacitor current stress 43% without...

The X-TEAM 4155 delivers true IP68 waterproofing via dual-lip seals and potted windings, eliminating external housings for simpler thruster builds.

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Purpose-built underwater thrusters using brushless DC motors deliver critical reliability for ROVs and diver units through pressure-tolerant...

• Cavitating water jets from horn-like nozzles achieve higher peak pressures via bubble collapse than non-cavitating jets, enabling efficient ice...

The U2 Underwater Thruster is evaluated for practicality on kayaks and small inflatable boats, addressing whether adding an electric unit justifies the upgrade over standard propulsion for personal watercraft users.

US Navy's ADS prototype eliminates decompression needs while protecting against extreme pressure.

• Life support upgrades include enhanced ducting,...

Chinese prototype uses boron-fueled underwater ramjet that operates at supersonic speeds in air before water entry, relying solely on forward velocity...

Compact Waterjet System Engineering

• 🔥 SEABOB SE63 Performance Board: The SEABOB SE63 uses a 35 kg titanium/magnesium/carbon fiber construction...

The SEABOB SE63 delivers 162 TP propulsive power through an electric drive, with Normal and Sport modes balancing underwater control against...

Recent foil hydrodynamics research reveals two trends with direct relevance for compact water-jet and foil-based systems in personal marine...