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Old Dec 21, 2015, 08:47 AM
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A push/pull twin with really big flaps!

Included as a "scratch built foamy" as it is nearly all 3mm sheet Depron but the wing is built in more or less the conventional spar/ribs/skin way.
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Being a twin allows the use of counter rotating props to eliminate torque an important consideration on a very slow flying plane and the push pull configuration keeps the battery, ESC and motors close together.
The flaps extend over 60% of its 40" (1016 mm) span and occupy no less than 45% of the wing chord. In addition the flaps have two sections and travel to a maximum of 85 degrees.
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Both flap sections are bottom hinged and driven from a single 5g servo on each side.
Two section flap test (0 min 8 sec)

Flown bank and yank the ailerons and elevator use 3,7g servos.
The motors are 2840kV Emax 2805 driving 3 blade 5x3 props. An novel feature is its very small hub allows a "spinner behind the prop" configuration which is also made of Depron.
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The battery is a 2200mAh 2s LiPo.
It weighs 12.5 oz (355 g) ready to fly - which it does quite well.
Plenty of power and with full flaps deployed it lands in a very short distance!
PushPull STOL flight and landing (1 min 54 sec)


Really just an experiment it has nevertheless survived for 3 years and is still going.
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Old Dec 21, 2015, 10:17 AM
basicguy is offline
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Dream it...Build it...Fly it!
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United States, MO, Macon County
Joined Dec 2014
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Very Clever, unique and a nice flier.

I have always liked the Cessna 336-337. Have one plane with twin tandem motors, a micro bat, the front motor had a mishap and the replacement motor turned the opposite way, so both motors turn the same direction, it does torque roll now.
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