The mod is at Aircraft Spruce.. and under "Vortelator" name; Kits start at $329 for homebuilt to $895 for Cessna. It claim that is so efficient in speed increase, that can save a lot of fuel!!. No mention on Cessna 337 stc, but the whole Cessna single engine fleet, so it should not be so dificult to request a stc for the skymaster.
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