There are lots of variations on this but here is my cheap and dirty no fuselage fastener required tail tiedown ring fairing. I cut out a cylinder of 3/8" wood with a diameter forming a snug fit in the tiedown ring. I made the fairing out of 0.016 2024T3 with a spacer keel at the bottom & rear joint. Drilled staggered holes on the left and right side. Installed with two short wood screws and dimple washers and taped the fairing to fuselage joint. I saw a small increase in speed on the order of 0.15 kt.
Bob Axsom
Bob Axsom
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