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Old 03-12-2006, 01:59 PM
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Default RE: asp 1.08 prop size

A buddy and I have Magnum 1.08s and for a scale plane the best we have found is an APC 16-6 or 15-8.

The Magnum and the ASP, as I recall, are the same engine. They tend to be torquer engines as opposed to high rpm engines. The instructions that came with mine mentioned a 13-8 or 14-8, but from flight tests, those didn't give any better performance than a .91. When we started going to big props and lugging the engine down, it came to life. For your large cowl on the GeeBee, I'd say a 16-6.