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Old Mar 20, 2004, 10:37 AM
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edkoz's Avatar
Rochester, MI
Joined Apr 2003
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What does 40 size, 60 size refer to ??

Can somebody explain to me what a 40 size, 60 size airplane means.

Ed
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Old Mar 20, 2004, 10:50 AM
Professional idiot
Hampshire, UK
Joined Jun 2002
3,119 Posts
It refers to the size of a glow engine in cubic inchs. 40 is actually .40 (7.5cc) and 60 is .60 (10cc)

It's a good way of classifying the required power for a plane. Glow engines tend to be quite close to each other in power (roughly speaking)

Electrics don't fall into such categories as gearing/no of winds/cell counts can make a really huge amount of difference.

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Dave
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Old Mar 20, 2004, 04:37 PM
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edkoz's Avatar
Rochester, MI
Joined Apr 2003
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Dave:

Thanks for the reply. That's what I thought it was but wasn't quite sure.

Ed
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Old Apr 03, 2014, 03:46 PM
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.40 to foamy

What would an equivalent foamy be?
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Old Apr 04, 2014, 10:28 AM
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United States, OH, Canal Winchester
Joined Feb 2007
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I found back when I was trying to understand the sizes that E-Flite is the best place to understand them since their brushless motors are still designated by .10,.15,.25..ect size. So a Power25 E-flite motor is equivalent to a .25 Glow. You can check their planes and see like the Beast 60e is a .60 size model needing at least a 60size brushless motor. You can compare the specs with other motors from different vendors to find a motor that isn't sized that way.
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