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How to size a engine for an RC kit???

Old 07-07-2011, 01:54 AM
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SnapDragon 44
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Default How to size a engine for an RC kit???

I need help on how to size a engine for a RC kit that I'm converting from gas powered to electric powered. How do I tell what kind of electric engine to put in it? Thanks!
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Old 07-07-2011, 02:14 AM
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xmech2k
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Did you check this out yet?

http://www.wattflyer.com/forums/showthread.php?t=24238
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Old 07-07-2011, 02:19 AM
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kenchiroalpha
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Hi
Welcome aboard
Pleased to meet you
Here ya go
http://www.gregcovey.com/Glow_Conversions_Made_Easy.htm
http://www.gregcovey.com/electric_conversions.htm
This has helped me to easily convert some of my older IC aircraft to e power
Take care
Yours Hank
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Old 07-07-2011, 02:51 AM
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CHELLIE
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Originally Posted by SnapDragon 44 View Post
I need help on how to size a engine for a RC kit that I'm converting from gas powered to electric powered. How do I tell what kind of electric engine to put in it? Thanks!
Hi The Easiest way to convert your gas to e power plane is to contact Jeff at Heads up RC, he is the Gas to E Power Expert Its what he lives for LOL , He has motors, esc, lipos,etc, and is very very reasonable, and shipping is only $2.00 for 1 item or for 100 items,give him a E Mail, Tell Jeff that Chellie sent you Take care and have fun, Chellie

http://www.headsuprc.com/servlet/StoreFront

http://www.headsuprc.com/servlet/Service

http://www.wattflyer.com/forums/showthread.php?t=62346

http://www.wattflyer.com/forums/showthread.php?t=56816
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Old 07-07-2011, 06:31 AM
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kyleservicetech
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Originally Posted by SnapDragon 44 View Post
I need help on how to size a engine for a RC kit that I'm converting from gas powered to electric powered. How do I tell what kind of electric engine to put in it? Thanks!
What is the wingspan and wing area of your model? And what will be the estimated weight of your model, not including the motor and battery system?

That will have a very big impact on which motor/battery system you select.

In general, anything over about 100 watts per pound of airplane weight will result in a decent flying airplane. However so many variables exist on various power setups that it's wise to check out one of those electric model computer programs to help in the design process. One I've used for several years is www.motocalc.com, free for 30 days, then $39.

You may be used to glow engines turning propellers in the 9-12,000 RPM range. Won't happen with these electric powered systems. Typical motor RPM's on these models is in the area of 5000 to perhaps 8000 RPM, swinging a propeller diameter that many equivalent horsepower glow engines simply can't handle.

I've got a 8.5 pound Hanger 9 Showtime 50 model with a Hacker A50-16S motor, 16X12 APC-E prop, 7S2P (7 Series, 2 Parallel) A123 battery pack that turns the propeller at 6700 RPM. That power plant hauls that model with authority straight up until it is out of sight. Vertical figure 8's are not a problem at all.

If your model is in the 8 pound size, or even if it's not, check out this thread for a bit more information. Hope it helps.

Thread on 70 size glow engine conversion to electric
http://www.wattflyer.com/forums/showthread.php?t=45222

As always, if you have questions, post them here in www.wattflyer.com. Just about every one of us were in your shoes at one time or another, and they will be glad to answer what ever questions you may have.
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Old 07-07-2011, 07:01 AM
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SnapDragon 44
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Thanks for the links everybody that really helps!
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