Thanks for the feedback so far. I realize that when you post on prune, you have to be prepared for all comments, so no problem with a bit of urine extraction. As observed, this is not the first machine that I have built. MK 1 Bug hovered on tethers but had insuffient tail rotor authority. It was powered by a 500cc Rotax. MK 2 Bug was a development from MK1 this time powered by a K series BMW unit. the carbon composite boom and belt drive system on this machine proved to be unreliable. MK3 as you see in the picture, is almost ready for a ground run. When I raised the question of testing such a machine indoors, the man from the CAA could not give a positive answer. I was therefore interested in Pruners comments. Regarding the effects of turbulence when operating a rotor system indoors. I have conducted a series of tests using a fifth scale rotor test rig in an enclosed enviroment , and feel confident that the feedback rate of rotor induced turbulence given that a seven to one ratio of rotor span to barn space is observed, even I as a NON RATED LEARNER can handle . Should Buggy not post on Prune again you will know I got my sums wrong. ppheli this machines got a bigger kick
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