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Proper selection and design of the propeller is one of the keys to airplane performance.

Columnist Dan Checkoway appreciates the flexibility of owning a homebuilt rather than a certified aircraft. On a recent condition inspection of his RV-7, he detected small cracks in the front spar of the horizontal stabilizer. A week later he was working on replacing it, without any intervention from the FAA.

In the days of the Wright brothers, the Flyer would have been impossible had the boys not endeavored to develop their own powerplant. While the Experimental/Amateur-Built movement has been carried aloft by versions of certified aircraft engines, the alternative engine movement has provided viable options for builders. By Marc Cook.

Aeroelasticity—structure with a twist.