The lead guy in our airshow team, the West Michigan Aerobats, has flown a flying lawnmower for a number of years. I don't think it was from a kit, though. From what I've seen, it looks a handful to fly (never tried it myself). Needs a good strong engine to get off the ground.

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FlyingThingZ was briefly in operation at least in 2015; I managed to get a flying doghouse kit from them. I'd heard that someone else was buying the business. Hope it happens (or happened) - they had some unique 'thingz'!