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70" Revolver Engine Question

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70" Revolver Engine Question

Old 04-21-2010, 09:50 AM
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tes21966
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Default 70" Revolver Engine Question

I recently purchased a GP 70" Revolver. I was a little surprised at the recommended engine sizes. Up to a 75 Two Stroke and 91 Four Stroke. These sizes seem very conservative based on the size of the plane (70" SPORT Plane). I am planning to use a four stroke engine and I was curious to see how many have actually built the plane with a glow engine and what size engines were used?
Old 04-21-2010, 10:56 AM
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dignlivn
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Default RE: 70






If it was me, I would think about a 20cc Saito (Gas).
or 120 size 4 stroke.


JMO,

Bob

Old 04-21-2010, 11:38 AM
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tes21966
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Default RE: 70

Thanks.

I was thinking along the way of a 115 or 125 Saito myself.
Old 04-21-2010, 06:45 PM
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wjcalhoun
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Default RE: 70

There is a great thread in the ARF section that discusses engine selection, among many other aspects of setting up this aircraft.

There may be a consensus on .90 - 1.20 2 strokes

Check out the thread


http://www.rcuniverse.com/forum/m_9143970/tm.htm



Old 04-21-2010, 07:45 PM
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ChuckW
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Default RE: 70

I put an OS 1.10 4-stroke in mine. Outstanding power and seemingly endless vertical. I can't imagine needing any more than that. The GP video uses an OS .91 4-stroke and I'm sure that is plenty.
Old 04-22-2010, 08:21 PM
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airraptor
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Default RE: 70

I have the OS120 AX on the smaller one so I say go with the 120AX on the bigger one too.

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