Will my first scratch built electric Fly. - RC Groups
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Feb 21, 2004, 06:48 PM
Foam Junkie

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.
Last edited by BGR; May 28, 2014 at 05:38 PM.
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Feb 21, 2004, 09:44 PM
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phonics-monkey's Avatar
Cool plane!
Feb 22, 2004, 12:55 AM
Registered User
Dr Kiwi's Avatar
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
Feb 22, 2004, 02:10 AM
Foam Junkie
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.
Feb 22, 2004, 07:22 AM
Rehab is for quitters
LuckyArmpit's Avatar
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.

Feb 22, 2004, 08:03 PM
Registered User
Dr Kiwi's Avatar
I hate those elongate threaded shafts - collet type adapters on Dremel-shortened shafts are so much better and more versatile!

Cheers, Phil