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Old 02-17-2014, 10:27 PM   #2
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Location: Lacey WA, 1 mile E of Mushroom Corner
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I am wondering the same thing, as I have 4 - 450+ watt motors, that I may build a B-17 with.

In my nitro days if you put 2 .30 engines on a twin, it would act and preform like it had a .90 motor on it.

People explained it by relating it to the swept area of the propellers. They said the area of props on the 2 - .30 engines, was more equal to the area of a single prop on a .90 (roughly)

I know a couple of twins I built back then, startled the heck out of my when they took off.

I don't as yet know of a calculator for multis.

Dave R, KI7MTA Proud PGR rider.
When you have flying skills like mine,
You become a master at repair.
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