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Kit Stuff

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2021 Propeller Buyer’s Guide

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Which Propeller?

Aero ‘lectrics

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Columnist Jim Weir has completed his solar-powered battery charger, and it works! It may not be the fastest charger, but it is certainly up to the task of keeping a battery topped off, even in winter.

Wind Tunnel

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Stall flutter is the result of the elastic axis of a wings surface being aft of the aerodynamic center, resulting in instability. A vicious cycle of lift, twist, stall and lift may ensue.