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Old 10-16-2006, 01:52 PM
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ezurk1
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Join Date: Apr 2006
Location: West Haven, UT
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Default Suggested Engine Size for Bi-plane

I have a Goldberg Ultimate Bi that has never been flown and it has a Super Tiger Gs-90 2-stroke installed. I have just "acquired" a new Magnum XL-91 4 stroke. I don't want to guess at which engine would be more appropriate for this plane, but my goal is to have better climbing power than speed. The Super Tiger instructions say to run a 13x8 prop. The Magnum recommends up to a 14x8. Any suggestions on which engine to use? Or should I forget both engines and step up to a 1.20 4-stroke.