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Drawing on experience; by cartoonist Robrucha.

Seemingly two peas in a pod are the GlaStar and its factory-built derivative, the OMF Symphony. We flew both of these wonderful two-seat aircraft to get a handle on what either FAR Part 23 certification or the freedom of homebuilding means to those facing such a delectable decision. By Ed Wischmeyer

Patrick Panzera explains some specific formulas he uses to see if an engine' claimed numbers pass muster.

If you're going to get a welder for aircraft work, it should be a TIG machine.