Tuesday, March 24, 2015

VSKYLABS PJSP-2/Land 'Discotheque'

VSKYLABS PJSP-2 Discotheque

Original Design Valveless Pulsejet Powered Light Sport Plane Prototype.

The PJSP-2 Discotheque is a research prototype which designed for control, stability, and ground handling investigation of lightweight, short and tailless aircraft. 


** LAND (10.42) AND SEA (10.32) VERSIONS **


General information:
Unlike the PJSP-1, The PJSP-2 is a "low-tech" aircraft, equipped with minimal on board systems, simple powerplant (no moving parts valveless pulsejet), mechanical control system and fixed landing gears.

The purpose of this project is to check plausible configurations, performance and handling qualities of a lightweight and tailless aircraft configuration.

Test flights in X-Plane made with different wingspans, landing gears configuration, vertical stabilizers configuration and weights.

Final wing area, vertical stabilizers configuration and position, and landing gears layout were proven as the most comfortable to handle.

General flying tips:

The PJSP-2 is very agile. It's large swept wing and it's large twin vertical stabilizers makes it stable and controllable in almost any situation. Being tailless and "short" makes it a bit sensitive in pitch control, so put it in mind especially when taking off or landing.


Full power,
Rotate at 60 to 70 knots,
above 100 knots reduce throttle to 90%


Slowdown to a 100 knots,
Final at 80 to 90 knots.
Flare gently since this plane is a floater,
Touchdown at 60 knots, on the stall.

PulseJet engine:

X-Plane doesn't simulate pulsejet engines. The PulseJet engines of the PJSP-2 are rocket engines, configured to match it's predicted thrust and fuel consumption.
PulseJet engine operation envelope is limited to low - mid subsonic speeds and altitude (internal to ambient pressure ratio issues to maintain it's resonance).

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