10.5x4.5 apc prop can be ordered from Tower. Easy to get in the past. I've used that prop with Tower 40 engines on all kinds of planes. Busters, Flite Streaks, Magician, Vector 40, Tanager, Galaxy, Oriental, Prowler, RD1. Engines were tuned with Venturi, head gaskets and fuel. Planes weighed mid twenty ounces to high forty ounces. Oh yes. Also powered some Twisters of mine.
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