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Jun 25, 2009, 01:06 AM
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X-31 EDF Park Jet


This is an EDF model of NASAís X-31 Enhanced Fighter Maneuverability Demonstrator, which flew in the early 1990ís. The X-31 had a thrust vectoring system that provided greatly improved post-stall and high alpha maneuvers. This model also features a thrust vectoring system, though I used vanes instead of paddles in the exhaust flow since they work better at model scale and are easier to build and set up. The X-31 park jet features simple foam construction similar to my other pusher prop park jets, and is very quick to build. In flight this model is very quick on the controls, but generally handles well and is fun to fly.

Specs:
Wing area: 144 sq in
Span: 20.5Ē
Weight RTF: 13.5 oz
Wing loading: 14 oz/ft2
Motor: Hyperion Y22S 5000 kV
Fan: Wemotec Microfan
Battery: Thunder Power 11.1V 1320 or 2100 mAh Pro-lite Lipo
Current draw: 20.0 amps static
Power input: 200 watts
Power loading: 240 watts/lb
Electronics: Hitec Electron 6 Rx, Phoenix 25 ESC, 5 GWS Pico servos
Flight controls: Elevons, canard, rudder, pitch control vane, yaw control vane (5 servos total)

This model was designed for the Wemo Microfan (50mm diameter), but I've also attached plans below that are scaled up 145% to fit the Wemo Minifan (68mm diameter).

The first flights of this model revealed a minor tip stalling problem at high alpha, and since high alpha is what this model is all about I designed a modified wing to try to improve the situation. The new wing did indeed improve high alpha, but the improvement was small (there is still some tip stalling). But I think the new wing looks better, too, so I left it on (even though it is not scale). For those that want to try it, I've included plans for the alternate wing below.

Useful links:

Build thread: https://www.rcgroups.com/forums/showthread.php?t=509363

Construction guide: http://www.parkjets.com/X-31_Construction_Guide.pdf

Flight video:
X-31 EDF Flight Demo (3 min 3 sec)
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