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Model Forum / Radio Controlled / Helicopters / August 2003Head Speed?
What is a decent way to adjust head speed without a tachometer? Wondering if my head speed is a bit on the steep side.  SignatureBiggie in PA sjg1958 at hotmail dot com > What is a decent way to adjust head speed without a tachometer? Wondering > if my head speed is a bit on the steep side. Unless your ears are tuned to "the right sound", it's going to be a bit difficult:-) SignatureBeav Please note my E-mail address is "beavis dot original at ntlworld dot com" (with the obvious changes) Beavisland now lives at www.beavisoriginal.co.uk Will a head overspeed cause control problems? I know an underspeed will. SignatureBiggie in PA sjg1958 at hotmail dot com > > What is a decent way to adjust head speed without a tachometer? Wondering > > if my head speed is a bit on the steep side. > > Unless your ears are tuned to "the right sound", it's going to be a bit > difficult:-) > Will a head overspeed cause control problems? > I know an underspeed will. Not control problems exactly, but the heli won't fly along the chosen line quite so well. Usually an overspeed shows itself as a tendency for the heli to lift it's nose and roll slightly to one side, and although it's not a lot, it's noticable and a pain in the airse to deal with. Better to have no changes in rotor speed at all, which is why I run governors in mine now. Fiddling with pitch and throttle curves is all well and good, but when you've got a pitch curve relationship which allows a well controlled rotor speed going UP in a ballistic climbout, it's usually lacking when your coming DOWN at speed, so that's a good enough reason to go with a gov, specially when they're cheap as chips these days. SignatureBeav Please note my E-mail address is "beavis dot original at ntlworld dot com" (with the obvious changes) Beavisland now lives at www.beavisoriginal.co.uk >> What is a decent way to adjust head speed without a tachometer? Wondering >> if my head speed is a bit on the steep side. Having read some of the responses, I think I should have committed hari kiri by now for never having had a tachometer. If you feel headspeed is a bit high, then wind the rotor blade linkages in a couple of turns to give yourself more pitch, then go fly! If headspeed is too slow, the helicopter will start to feel mushy, the engine won't 'sing' quite as much and you could lose some preciseness in the tail control. If it is too high the helicopter tends to react very quickly to your controls (uncomfortably quick in some cases), you burn fuel very quickly, and the general sound of it is usually more like a plane than a helicopter. As with most of these things, you need to experiment with your own particular helicopter. Slow the head down until it feels and/or sounds uncomfortable, then speed it up until it feels/sounds uncomfortable, then aim for a speed that is somewhere in the middle. You can do it by eye/ear with a lot of success. You may also find you don't need as much headspeed on a calm day as a windy one. Watch that you still leave yourself some negative pitch however you set the blades. |
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