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Model Forum / Radio Controlled / Helicopters / November 2005Piccolo wobble!
Hello folks, My Piccolo seems to have developed a slow wobble around the mast a few seconds after it lifts off. This gets worse and worse until you are forced to land. I recently upgraded from the fixed pitch to the collective version and this is when the wobble first appeared. I have tried a second set of blades and the result is the same, any ideas what it may be? Thanks, Harry > Hello folks, > [quoted text clipped - 7 lines] > > Harry Bent main shaft or flybar shaft? Strip them both down and roll them each on a flat piece of glass to hear if they make the tell tale snick snick sound. My flybar shaft was bent from new but a gentle bit of pressure straightened it out. Chris > Hello folks, > [quoted text clipped - 3 lines] > version and this is when the wobble first appeared. I have tried a second > set of blades and the result is the same, any ideas what it may be? Rotor speed is too slow. You've gone from a fixed pitch Piccolo with a very slow rotor, to a collective pitch, but I'm betting your head (your mind head that is) is fixed on the original rotor speed, but with less area, the collective pitch blades require a higher rotor speed. There is another possible cause, although it's unlikely, but.... check it anyway. The flybar/flybar carrier. If that's been somehow twisted so the angle between the flybar and the main blades isn't 90 degrees, this can cause the wobbles, but as I say, I think it's unlikely.  SignatureBeav Reply to "beavis dot original at ntlworld dot com" (with the obvious changes) OMF#19 Thanks Beav, I have set the head speed at 1650rpm but I have not had the head apart to check the mast or flybar yet. I got this figure from the manual, do you think this is correct or should it be faster than this? H > > Hello folks, > > [quoted text clipped - 13 lines] > angle between the flybar and the main blades isn't 90 degrees, this can > cause the wobbles, but as I say, I think it's unlikely. > Thanks Beav, > > I have set the head speed at 1650rpm but I have not had the head apart to > check the mast or flybar yet. I got this figure from the manual, do you > think this is correct or should it be faster than this? It sounds pretty good Harry, but have you checked it's actually DOING those revs? 1650 shouldn't have it wobbling. SignatureBeav Reply to "beavis dot original at ntlworld dot com" (with the obvious changes) OMF#19 Yep, I set it up with a tacho and 1650 was the average reading. Will take the head apart tonight to check for any nastiest. H > It sounds pretty good Harry, but have you checked it's actually DOING > those revs? 1650 shouldn't have it wobbling. |
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