Friday, March 20, 2015


Ducted-Fan Powered Sport Plane Prototype.
A concept ultralight "cold jet" airplane.

You can read about the general characteristics and inspiration of the VSKYLABS DFSP-39
In the PDF document link below, from the: 24th International Congress of the Aeronautical Sceinces.

VSKYLABS DFSP-39 specifications:
The DFSP-39 is a little different from the lightweight L-39 research described in the document link above. It is a single seat plane, slightly bigger and powerful.

Type: Single seat lightweight Ducted Fan powered sport aircraft.
Powerplant: One 210hp reciprocating engine which drives 14 blades fan unit.
Wingspan: 20.6 feet
Length: 22 feet
Height: 11.5 feet
Weight: empty - 1000 lbs, full - 1300 lbs
Flight ceiling: not available yet - project and plane under development. 
Internal fuel: 220 lbs
SFC: not available yet - project and plane under development.
Range of operation: not available yet - project and plane under development.
Cruise speed: 95 knots
Maximum speed: 220 knots
Stall speed: 60 knots

Flying tips for the DFSP-39 on X-Plane:
In general:
The DFSP-39 is small and light plane. Controls are sensitive but it's behavior is docile and very predictable. It looks like a fast and aerobatic Jet, but it isn't. It is an ultralight plane that's flying "on it's wings". The DFSP-39 is under powered. Mild vertical aerobatic maneuvers can be achieved by flying the plane above 150 knots.

Speed management: 
Acceleration is slow. You will notice this fact upon take off, and whenever trying to reach it's fast-cruise speed (above 100 knots).
Do not forget - it is an ultralight plane, so give it some slack...

Take off and landing: 
Take off is straight forward: Apply full power, nose up at 70 knots, lift off at 80 knots.
Landing the plane is really fun since it has a stable and slightly high sink-rate / steep glide-slope when on idle and at 80 knots, which can be managed easily with good engine response and effective controls.
Reduce to idle after crossing the runway threshold, touchdown below 70 knots.

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