Revised Bumble Plane
Revised nose section Depron covered with tape 40 Grams, Half the weight of the foam board
New larger tail 35 Grams, 60 Grams for the foam board one
Wings are 105 Grams
Take off weight 322 Grams with Rhino 610 3C
New dimensions Span 680 mm length 680 mm
It looks more in proportion now
The spars are 5 mm square carbon I think it needs to be a bit stiffer tortionally
New Baby Twin Boom 700mm Bumble Plane
New Baby Twin Boom 700mm Bumble Plane
Maiden Flight Here
With any luck will give it a flight in Akaroa tomorrow
Maiden Flight Here
With any luck will give it a flight in Akaroa tomorrow
Foam Board, hot glue and tape
Span 700 mm
Length 730 mm
Length 730 mm
Flight weight 385 Grams
C20 1550kv motor
6X4 APC prop delivers 385 Grams of thrust @ 9.7 Amps
Turnigy nano-tech 460mah 3S 25~40C Lipo Pack 45 Grams
2 X 2.5 gram servos
Hobbyking SS Series 8-10A ESC
The tape weighs 15 Grams and add so much durability in a crash
6X4 APC prop delivers 385 Grams of thrust @ 9.7 Amps
Turnigy nano-tech 460mah 3S 25~40C Lipo Pack 45 Grams
2 X 2.5 gram servos
Hobbyking SS Series 8-10A ESC
The tape weighs 15 Grams and add so much durability in a crash
The wing is a 200 mm chord with a 10 mm under camber shown above. It has a single aileron and elevator.
Wing Area: 14 dm² 1.5 ft²
Wing loading: 28.57 g/dm² 9.37 oz/ft²
Wing Area: 14 dm² 1.5 ft²
Wing loading: 28.57 g/dm² 9.37 oz/ft²
Flew Ok not great elevator Authority, roll was Ok the aluminum spars were too fragile it got bent on the back of the car before I flew it. Sadly no video today but it was three 1 minute flights before I killed a servo
I also used the bad method launching and the razor sharp APC prop gave me a nice cut on the back of my hand. Blood letting aside it flew Ok with a 3 cell Rhino 360 mAh. Ran at half throttle plenty of lift at low speed, that's where the elevator is quite slow, perhaps the tail should be shorter, closer to the prop which would make the pitch rate faster, but reduce the mechanical advantage, the design from http://www.foamflyer.info has shoter tail spars. Or perhaps a bigger tail and elevator is the way to go, not sure yet will do a bit more research see whats on the www
The tail to on mine is 2 dm² ratio of the wing area is 12 / 2 = 6
On the So.X below 4.4 dm² ratio of the wing area is 15.4 / 4.4 = 3.5
So her tail is too small, half as small as So.X shown below. Umm?
To address the problem here is the plane with a larger tail
The tail below is 3.5 dm² ratio of the wing area is 12 / 3.5 = 3.11
Also I will have a single tail fin I think
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