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Pulsed Turbine Transvector Jet

Pulsed Turbine Transvector Jet Engine

The Pulsed Turbine Transvector Jet Propulsion concept is a recently developed adaptation to the Pulsed Turbine Rotor Engine. The pulsed turbine jet engine concept has simultaneous-independent, gyro-digitally controlled multiple jet engines. The transvector jet principle allows the pulsed turbine jet engines to more smoothly transition from vertical to horizontal flight.

With the overall design having the unusual twist of using laser-activated steam boosters for final approach cushioning on vertical landings.

These innovative designs are the boost engine manufacturers need to address problems as low fuel efficiency, reliability and parts count we see in modern piston powered vehicles. Being experimental in nature we dedicated this section of the site to such engine designs while not making any judgments on viability of the these sometimes very creative creations.

This page discusses the Jetcar and its propulsion system, the Pulsed Turbine Transvector Jet.


The VTOL JetCar is a new personal jet-powered aircraft concept. It will perform a function that currently no other aircraft can accomplish. When incorporated as standard safety procedure, this new aircraft will execute: 'the first ever automated vertical-flight turning-into-the-wind maneuvers', during the most crucial stages of flight: takeoffs and landings. A great application of the transvertor jet engine. More can be found at this link: VTOL JetCar.

This is a perfect example of a 'flying vehicle', you may want to read more on that subject in our article on Flying Cars Design, Visionary or not, click here.

Engine Principle

The Pulsed Turbine Engine is a newly designed, compressor-driven, with heat exchanger, "fuel injected" turbine engine. For its anticipated power output, it is a compact design with fewer moving parts and an expectedly quieter operational performance than that of a similar class reciprocating engine. Click here for a large image of the pulsed turbine transvector jet engine.

In the class of small turbine engines, it should yield greater fuel efficiency then conventional turbine engines because it utilizes fuel injectors and delayed heated compressed air that is allowed to increase in density before entering into multiple rotating combustion chambers to generate substantial power output.

VTOL application

Pulsed Turbine Transvector Jet

The transvector jet principle with optional water spray/steam thrust booster was envisioned to ensure ample thrust to vertically launch a VTOL jet propelled vehicle and speed up its transition to horizontal flight. This innovative idea could expedite the vehicle’s transition to horizontal flight from a vertical launch and consume less conventional fuel in the process.

Applying the same principle introduced by the Pulsed Turbine VTOL Gyro-Stabilized Jet Propulsion Platform, four identical Pulsed Turbine Jet Engines are linked physically by a central thrust vectoring transmission drive and also linked electronically by a central gyro-controlled computer.

During hovered flight each Pulsed Turbine Jet engine utilizes its own continuously monitored and calibrated electronic feedback network to alter the pulse-width or duration of fuel injection to maintain a specific thrust output which would be approximately equal for all four engines.

This feedback network maintains this default thrust output setting until an electronic gyro input signal is received to temporarily allow a new or variable setting. Once the gyro input signal is discontinued the feedback network returns to its original default setting. This concept establishes independent engine control for a multi-jet engine gyro-stabilized VTOL platform.


Output thrust is first initiated by substantial exhaust generated by dual tandem four-chambered ultra-high speed rotary Pulsed Turbine Rotor Engines. This exhaust is channeled separately from each Pulsed Turbine Rotor engine to a reheat or afterburner stage where additional fuel is added to the hot exhaust and reignited if necessary. These separate channels of reheated exhaust are then channeled together to create jet thrust propulsion.

Pulsed Turbine Transvector Jet

Altering fuel injection in the Pulsed Turbine Rotors has an intrinsic effect on the pressure buildup throughout the exhaust channels. This pressure and resulting thrust can be varied precisely by activating one, two, three or more, up to all eight gyro-controlled fuel injectors.

Jet stage

The secondary transvector jet stage draws additional ambient air via suction resulting from the jet thrust exiting from the Pulsed Turbine Jet Engine into the secondary stage. The steam booster or water injection into the transvector jet is an optional function. Its intended use is to provide additional temporary thrust that is channeled through thrust-vectoring nozzles to hasten the jet powered vehicle’s transition from lift-off to normal horizontal flight just beyond the aircraft’s rated stall speed.

Automatic water injection shutoff would occur when the aircraft reaches a specified airspeed. Under normal conditions the time elapsed for this function is anticipated to be less than 30 seconds.


Steam boosters can also be used as final approach cushioning for vertical landings and automatically activated by a LASER altimeter at approximately five feet prior to aircraft touchdown. Landing gear contact switches could be employed to shutdown the steam boosters’ water injection system.

Text reprinted with permission.

More information

Tech brief June 2010: The VTOL Pulsed Turbine Transvector Jet Concept

Written by EAI.

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