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Twin Boom 700mm Bumble Plane

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Old 03-09-2013, 06:05 PM
  #1
nickatredbox
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Default Twin Boom 700mm Bumble Plane

New Baby Twin Boom 700mm Bumble Plane

New Baby Twin Boom 700mm Bumble Plane



Foam Board, hot glue and tape
Span 700 mm
Length 730 mm
Flight weight 385 Grams
The wing is a 200 mm chord with a 10 mm under camber shown above. It has a singleaileronand elevator.

Wing Area: 14dm² 1.5ft²
Wing loading: 28.57 g/dm² 9.37 oz/ft²



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Old 03-11-2013, 06:15 AM
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Villa
 
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Default RE: Twin Boom 700mm Bumble Plane

How does it fly?
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Old 03-11-2013, 01:05 PM
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Default RE: Twin Boom 700mm Bumble Plane



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'swhere 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 fromhttp://www.foamflyer.infohas shoter tail spars. Or perhaps a bigger tail and elevator is the way to go, not sure yet will do a bit moreresearchsee whats on the www
Found this design onhttp://www.foamflyer.infolooks like my stabilizer may be too small at 30 mm this one is 50 mm but its a bigger plane with an 880 mm span.

The tail to on mine is 2 dm² ratio of the wing area is 12 / 2 = 6

On the So.X below 4.4 dm²ratio 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?


http://kiwitricopter.blogspot.co.nz/...ne-maiden.html
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Old 03-11-2013, 01:47 PM
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Default RE: Twin Boom 700mm Bumble Plane

http://kiwitricopter.blogspot.co.nz/...ne-maiden.html
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Old 03-12-2013, 07:20 AM
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Default RE: Twin Boom 700mm Bumble Plane

Hi nickatredbox
I have a similar plane. Instead of aluminum booms, I used hollow arrow shafts made from carbon fiber. I managed to purchase some used arrows from a hunting supply store. I aslo used two arrows as wing spars.
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