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Direct vs. geared drive-one of aviations great debates.

Have you checked your fuel system for leaks lately? Turns out there's a good reason to periodically conduct a thorough investigation. Incipient leaks may go undetected. Worse, when the O-ring on the fuel-selector valve goes bad, it could allow air into the system, which means your engine could misbehave at a most inconvenient time. Often, this malady is difficult to diagnose and the assumption is that the fuel selector is OK when it is not.

Marc Cook spends a few days helping perform the annual on a friends RV-7A, and finds it much easier than doing his own.

What's the difference between the FAAs SLSA (Special Light Sport Aircraft) and ELSA (Experimental Light Sport Aircraft) designation? DAR Mel Asberry clears it up.