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Old Feb 18, 2014, 09:49 AM
tommy tough nuts
fepsphan's Avatar
Joined Jul 2013
88 Posts
Help!
Motor size

I built a dollar tree foam plane and it weighs about 997 grams. What is a good size motor and esc? Im trying a 650kv and 50a esc. Im kinda new to the motor sizes and pull. Faster v slower and stronger. This is my 3rd scratch build. She flew really nice. I landed it fine, but rolled into a snow/ice bank and now the motor has lost power. I tried different batteris, my main battery for it is a 14.8 2200 mah. Any ideas?
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Old Feb 18, 2014, 11:02 AM
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United States, MI, Warren
Joined Aug 2011
642 Posts
Hi Fepsphan,The motor should be able to get wet,did you take the prop off and put it on backwards?

Usually approx 10% of plane weight is a good place to start for motor weight.Kv will depend on the type of plane it's for and size of prop you want to spin.

Maybe blow the motor out with compressed air while turning over by hand,I've had sand and gravel get in there and make it feel chunky.Hope this helps,maybe someone else will have ideas.
http://www.motocalc.com/motocalc.htm

Try this site also.
http://adamone.rchomepage.com/calc_motor.htm
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Last edited by maurice076; Feb 18, 2014 at 11:10 AM.
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Old Feb 18, 2014, 11:33 AM
tommy tough nuts
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Joined Jul 2013
88 Posts
it did the same hours later. something isnt right
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Old Feb 18, 2014, 04:31 PM
tommy tough nuts
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Joined Jul 2013
88 Posts
Quote:
Originally Posted by maurice076 View Post
Hi Fepsphan,The motor should be able to get wet,did you take the prop off and put it on backwards?

Usually approx 10% of plane weight is a good place to start for motor weight.Kv will depend on the type of plane it's for and size of prop you want to spin.

Maybe blow the motor out with compressed air while turning over by hand,I've had sand and gravel get in there and make it feel chunky.Hope this helps,maybe someone else will have ideas.
http://www.motocalc.com/motocalc.htm

Try this site also.
http://adamone.rchomepage.com/calc_motor.htm
thanks, they helped i think. ill fly tomorrow am and respond
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