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Old Feb 21, 2004, 05:48 PM
BGR
Foam Junkie
United States, CA, Oceanside
Joined Dec 2003
1,656 Posts
Will my first scratch built electric Fly.

I am building my first scratch built electric. It is a high wing decathlon type aircraft made from blucor fan fold. Since I am just starting in electrics I need some opinions on what to expect from the following setup.

Span 43"
Cord 6.8"
undercamber wing with 2.5 inch dihedral.
GWS EPS 300C 4.3 to 1 gearbox
GWS 9X4.7 slow flier prop.
7 Cell Kan 1050 battey pack.
GWS IPS300 speed controller.
Fixed gear tail dragger.
Rudder and Elevator control
Futaba PCM 512 5 channel receiver (its old but small)
2 Bluebird BMS-371 servos

Motor calc sais that this setup will fly very sedately but I have my doubts because of the estimated 9 oz/sqft wing loading.

I would like some opinions please.
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Last edited by BGR; May 28, 2014 at 04:38 PM.
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Old Feb 21, 2004, 08:44 PM
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phonics-monkey's Avatar
Joined Sep 2003
118 Posts
Cool plane!
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Old Feb 21, 2004, 11:55 PM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
27,199 Posts
Try a bigger prop (10x4.7? or 10x6 HD) in Motocalc - I think that might be better, unless the amp draw is too high.

Cheers, Phil
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Old Feb 22, 2004, 01:10 AM
BGR
Foam Junkie
United States, CA, Oceanside
Joined Dec 2003
1,656 Posts
Thanks Phil, yea I was looking at a bigger prop but it puts the amps at max for the ESC. However I tried a 9x6 and motor calc liked it even better than the 9x4.7.

Only issue with a 9x6 is that I cant find one with the right size hole, will need to use an adapter.
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Old Feb 22, 2004, 06:22 AM
Rehab is for quitters
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West Middlesex, PA, US
Joined Jun 2001
4,853 Posts
1st thing if you haven't done it yet is to spar up the wing. Make sure its rigid or it will buckle in the air due to the weight.

Dave...
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Old Feb 22, 2004, 07:03 PM
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Dr Kiwi's Avatar
Chattanooga, Tennessee, United States
Joined May 2003
27,199 Posts
I hate those elongate threaded shafts - collet type adapters on Dremel-shortened shafts are so much better and more versatile!

Cheers, Phil
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