Wednesday, March 25, 2015


Original Design of a high performance light Jet aircraft Prototype
The SPARK is a research prototype which designed for control and stability investigation of lightweight high performance aircraft.
(no drop-tanks version)


Project overview:
The VSKYLABS SPARK is a high performance light Jet aircraft, built around a turbo-fan engine such as the The Pratt & Whitney Canada PW600 (series of a family of very small turbofan engines developed by Pratt & Whitney Canada for use in very light jets.
Designed with scalability in mind, the engines can produce between 900 lbf (4,000 N) and 3,000 lbf (13,000 N) of take-off thrust).

The challenge of this project was to design the smallest and lightest, yet plausible, high performance aircraft, with a wide flight envelope and good stability characteristics.

How to fly the SPARK:
The SPARK is equipped with two external fuel tanks, for extending it's range of operation, but also degrades it's agility and it's overall performance. If you wish to fly the SPARK without the external fuel tanks, deselect them in the "weight and balance" window under "aircraft" tag in the simulation.

The spark is equipped with leading edge SLATS, which are fully automatic. They allow the SPARK to fly better in high Angle of Attack and at low air speeds by reducing the stall speed.

This feature is fictional and not plausible for the current configuration since the Afterburner uses high amount of fuel for it's operation. Using this feature in a very small and light aircraft will suck out all of it's fuel in a few minutes. The SPARK afterburner feature is for FUN, but the total given thrust of the engine with the afterburner equals this kind of engine
(such as the 2,500 lbf (11,000 N) thrust PW625F demonstrator which doesn't uses afterburner).

Take off:
Pitch trim up a bit.
Release Brakes.
Advance throttle to maximum.
This is a small and powerful aircraft. Runway correction slowly and gently.
Takeoff speed without the external fuel tanks: 80 knots.
Takeoff speed with the external fuel tanks: 100 knots.

No stability issues with or without the external tanks, beside being a bit sluggish when fully loaded.

No airbrakes or flaps, just retard the throttle and let it slow down.
Final between 3 to 5 degrees (use SHIFT + "w" for HUD view).
Airspeed 110 during final (add 10 knots when with the external fuel tanks).
After crossing the threshold, retard to idle, flare until touchdown.
Since the SPARK is a delta wing aircraft, stalls are usually not involving a drop down of the nose.
Expect high Angle of Attack buffeting and extended sink rate when stalling.
You can use the CHEVRON for optimal Angle of attack (will turn on when landing gears are down and locked).

Fuel consumption, Climbing performance and maneuvering:
This data is still under research, the SPARK will be fine-tuned on future updates to come.

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