Technology

The carbon fiber Jet-Lev Flyer JF 250 employs a powerful 4-stroke engine, a 250 HP and water nozzle reaction force to achieve stable, controlled flight. Flight controls are very simple light and intuitive.

The propulsion engine, fuel and related systems remain on a separate vessel tethered behind the jetpack.

Water is the ideal jet propulsion medium as its high density can carry vast amounts of power at much lower velocities, and generate nozzle reaction forces much more effectively, than gases.

Safety:
Extensive research and test results helped develop safety features and "best practice" operating procedures. Although falling from height or at speed is inherently risky, from our experience falling from our jetpack is rare. Keep in mind that platform diving from 10 meters has been widely practiced for over a century with excellent safety records. Central to our safety design is using water as a safety net and enforcing low flight ceilings by restricting hose length. The jetpack's 5-point quick-release harness, protective back rest and head support, safety saddle and inherent floatation are some of the many safety features.

Inherent stability and effortless control:
Even though the jetpack can generate upwards of 500 lbf (2.250 N) of thrust for lift and propulsion, the flight controls are isolated from that thrust and only take a few ounces of effort to adjust.

Flexible supply hose/tether:

A flexible water supply hose delivers power to the jetpack with pressurized water. It also serves as the tether, enforces a flight ceiling, discourages the pilot from flying over land, acts as a stabilizer, dampens vibrations, and maintains forward heading stability of the jetpack in flight.

  • Jetpack dimensions, with adjustable seat and adjustable control arms: 100cm x 100cm
  • Jetpack dry weight (approx.): 16 kg
  • Maximum Thrust: 2.250 N
  • Thrust-to-weight ratio at take off 85 kg pilot: 2.5 : 1
  • Boat length: 3,20 m
  • Boat beam: 1,20 m
  • Boat height with hatches closed: 75 cm
  • Boat weight dry: 280 kg
  • Engine: 4-stroke cycle marine engine
  • Engine HP (approx.): 250 HP at 6.800 RPM JF 250 model
  • Engine cooling system: Closed loop cooling with stainless steel internal heat exchanger
  • Hose dimensions: 10 m L x 10 cm diameter
  • Flight ceiling (measured at feet level): 8.5 m
  • Measured top speed with a 100 kg pilot : 47 km/h
  • Fuel capacity: 57 L
  • Duration at open throttle up to 2 hours
  • Duration at cruising speed up to 3 hours
  • Simple, intuitive flight controls: Fly-by-wire digital throttle control; nozzles angles determine allocation of thrust between lift and propulsion (forward, neutral or reverse); differential nozzle deflection generates yaw moments; and weight shifting from side-to-side generates roll moments.