F4U Corsair by GWS

  28 Mar 05 - First flight completed.

N of launches / Time 21

1 hour 55 mins

Wingspan 35 " 90 cm
Wing Area 232 in 15 dm
Flying Weight 1 lb. 1 oz 480 g
Wing Loading 10.5 oz/ft 32.1 g/dm
Wing Cube Loading

8.3 - between "Trainer" & "Aerobatic"

Motor

Cyclon Mini 3

Propeller APC Electric 9" x 6"
Batteries 3S Kokam 1250HD Li-Po (20C cells)
Speed Controller

Castle Creations Phoenix 25 - 25A - 5 to 16 cells - BEC & Brake - Programmable cut-off

Receiver / Battery GWS Naro R-6N/H - 6ch - PPM - 35MHz - sub-micro
Servos Ailerons - 2 x Ripmax SD-150
Elevator - Hitec HS-55
Rudder - Hitec HS-55
Static motor parameters  9.0A @ 10.5V giving 6600 rpm and 95W and \ approximately 90W/lb.  Thrust_XL estimates the thrust as 496 g giving a weight ratio of slightly over 1:1. This seems correct as the model feels weightless when held pointing vertically up.
Flight performance Climbs can be maintained at 45+ or be more scale like at reduced throttle.  Level flight can be maintained at well below 1/2 throttle travel.  Loops can be completed from level flight and do not require full power to complete.

10 Sep 06 - Whilst flying it Basingstoke MAC today the F4U spun in, completely out of control.  Fortunately the model was completely unscathed and didn't actually hit the ground - it was sitting on top of the stubble in the field.  Speaking to club members, this appears to be fairly common there when using the GWS Naro R-6N/H receiver.  I think I'll replace the receiver with a longer range version before flying it again.

28 Mar 05 - Finally managed to test fly the Corsair.  After a short ground run it climbed away at 45 with plenty of power in reserve.  After throttling back to a cruise setting, the only trim change made was 1 click of up elevator.  When throttled up the model rotates into a steady climb and is extremely stable in the air. Level flight can be maintained at well below 1/2 throttle travel.  Loops can be completed from level flight and do not require full power to complete.  The radio check was not quite as far as I would have like and I experienced a little interference at one point. Due to this I cut the flight short and landed after 2 mins 20 seconds.  I will be moving the receiver further aft, away from the speed controller.

26 Feb 05 - Minor update of static motor parameters.

29 Jan 05 - Just finished and photographed the model.

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