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Model Forum / Radio Controlled / Helicopters / June 2008T-Rex 450xl head speed
any idea what head speed for normal hovering and circuits I should be aiming at ? I have just brought my first tacho  SignatureKevin R Reply address works > any idea what head speed for normal hovering and circuits I should be > aiming at ? I have just brought my first tacho A minimum 1800rpm I'd say, but 2000 would be even better. SignatureBeav VN 750 Zed 1000 OMF# 19 >> any idea what head speed for normal hovering and circuits I should be >> aiming at ? I have just brought my first tacho > >A minimum 1800rpm I'd say, but 2000 would be even better. WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very sluggish and I'd be amazed if the tail held with the pitch needed to get it airborse at that RPM. >>> any idea what head speed for normal hovering and circuits I should be >>> aiming at ? I have just brought my first tacho [quoted text clipped - 3 lines] > sluggish and I'd be amazed if the tail held with the pitch needed to > get it airborse at that RPM. well I am running around 2100 if I hold the helicopter and measure, I will need to find a way to strap the tacho to get a proper in the hover reading and you are right it is sluggish but controllable SignatureKevin R Reply address works >> WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very >> sluggish and I'd be amazed if the tail held with the pitch needed to >> get it airborse at that RPM. >well I am running around 2100 if I hold the helicopter and measure, I >will need to find a way to strap the tacho to get a proper in the hover >reading and you are right it is sluggish but controllable IMO never a good idea to strap a heli down and run it up... Get a buddy to tach while you hover. >>> WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very >>> sluggish and I'd be amazed if the tail held with the pitch needed to [quoted text clipped - 5 lines] > IMO never a good idea to strap a heli down and run it up... Get a > buddy to tach while you hover. none of my buddies will get anywhere near me in the hover :-) I would not try the same trick with a 30 powered bird SignatureKevin R Reply address works >>>> WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very >>>> sluggish and I'd be amazed if the tail held with the pitch needed to [quoted text clipped - 8 lines] > none of my buddies will get anywhere near me in the hover :-) I would not > try the same trick with a 30 powered bird I've seen models that were strapped down to a table go into some significant harmonics with "not good" results! :-o You may be getting away with it with a 450 size bird but I have to agree with Kevin on this one, you're asking for it! ;-) As for the tach, the versions that Miniature Aircraft sells work very well and you don't need to be that close to the model to use them. The only downside is, they're not cheap, but they are very good! FWIW! :-) Fly Safe, Steve R. >>>>> WAY too slow for a 450 bird Beav. It'll fly, but it'll be very very >>>>> sluggish and I'd be amazed if the tail held with the pitch needed to [quoted text clipped - 11 lines] > I've seen models that were strapped down to a table go into some > significant harmonics with "not good" results! :-o I've got a heli stand so I can stand under the heli while it's revving its bollocks off. A nice YS 90 powered Futura revved to the max with every degree of pitch used from -12 to +12 and everything in between makes a wonderful droning noise y'know. VERY nice!. It's good to be able to fart about with those mixture screws while the heli's trying like f.ck to fly away, coz then you know the engine is NEVER going to bog down when it's flying. Trouble is, when the sh.t hits the fan (and it has) there isn't a whole lot left of the heli and that's if you can find the parts that escape:-) SignatureBeav VN 750 Zed 1000 OMF# 19 >I've got a heli stand so I can stand under the heli while it's revving its >bollocks off. A nice YS 90 powered Futura revved to the max with every >degree of pitch used from -12 to +12 and everything in between makes a >wonderful droning noise y'know. VERY nice!. Nothing like the annoying droning noise that SWMBO makes when she sees the hobby shop receipts I'd guess. :) >It's good to be able to fart about with those mixture screws while the >heli's trying like f.ck to fly away, coz then you know the engine is NEVER >going to bog down when it's flying. > >Trouble is, when the sh.t hits the fan (and it has) there isn't a whole lot >left of the heli and that's if you can find the parts that escape:-) Do you stand under the thing in an EOD suit whilst you fiddle??? >none of my buddies will get anywhere near me in the hover :-) I would >not try the same trick with a 30 powered bird Get a MA SkyTach and they can be 100' away and still tach for you. >> none of my buddies will get anywhere near me in the hover :-) I would >> not try the same trick with a 30 powered bird > > Get a MA SkyTach and they can be 100' away and still tach for you. thats a novel idea not sure you could tach when doing 3d though SignatureKevin R Reply address works >>> none of my buddies will get anywhere near me in the hover :-) I would >>> not try the same trick with a 30 powered bird >> >> Get a MA SkyTach and they can be 100' away and still tach for you. >> > thats a novel idea not sure you could tach when doing 3d though Believe it or not, yes you can. If the model has a half way decent setup, and the rpms aren't shifting all over the place, you should be able to get a pretty close reading. We've done it many times! >>>> none of my buddies will get anywhere near me in the hover :-) I >>>> would not try the same trick with a 30 powered bird [quoted text clipped - 6 lines] > setup, and the rpms aren't shifting all over the place, you should be > able to get a pretty close reading. We've done it many times! I have seen some flying were I cant even keep up with the naked eye, let alone look through a view finder SignatureKevin R Reply address works >>>>> none of my buddies will get anywhere near me in the hover :-) I would >>>>> not try the same trick with a 30 powered bird [quoted text clipped - 9 lines] > I have seen some flying were I cant even keep up with the naked eye, let > alone look through a view finder Yeah, well, I was referring to the kind of 3D flying us "mortal" types are likely to do! :-) I've successfully tached a friend of mine through kaos', tick-tocks, stationary flips, and other such nonsense. It was no big deal. As for the guys you're referring to? I just watch the show from a "descreet" distance! ;-) Fly Safe, Steve R. >>>>>> none of my buddies will get anywhere near me in the hover :-) I >>>>>> would not try the same trick with a 30 powered bird [quoted text clipped - 18 lines] > Fly Safe, > Steve R. I know that sort of flying takes skill, but pretty its not IMHO it just looks totally out of control , I like the more graceful moves SignatureKevin R Reply address works >>>>>>> none of my buddies will get anywhere near me in the hover :-) I >>>>>>> would not try the same trick with a 30 powered bird [quoted text clipped - 21 lines] > I know that sort of flying takes skill, but pretty its not IMHO it just > looks totally out of control , I like the more graceful moves Couldn't agree with you more! :-D >>>>>> none of my buddies will get anywhere near me in the hover :-) I would >>>>>> not try the same trick with a 30 powered bird [quoted text clipped - 15 lines] > big deal. As for the guys you're referring to? I just watch the show from > a "descreet" distance! ;-) I don't even bother watching that type of flying anymore Steve. SignatureBeav VN 750 Zed 1000 OMF# 19 >>> none of my buddies will get anywhere near me in the hover :-) I would >>> not try the same trick with a 30 powered bird >> >> Get a MA SkyTach and they can be 100' away and still tach for you. >> >thats a novel idea not sure you could tach when doing 3d though Sure you can.. If the knucklehead on the tach can keep up with the heli through the viewfinder and can manipulate the shutter speed at the same time. Easy? Not particularly.. Easiest would be something like an Eagletree with a brushless RPM sensor. >any idea what head speed for normal hovering and circuits I should be >aiming at ? I have just brought my first tacho 2800+ The TR is a bit soft so lack or RPM on the big fan translates to lack of RPM on the little one... I run all my 450s at 3000 on the head. You can run woodies, but make sure they're balanced VERY well and replace if if they have any contact with anything but air.. Thankfully, I crash often enough I don't have to worry about a set failing due to fatigue. :) >>any idea what head speed for normal hovering and circuits I should be >>aiming at ? I have just brought my first tacho [quoted text clipped - 8 lines] > contact with anything but air.. Thankfully, I crash often enough I > don't have to worry about a set failing due to fatigue. :) Try this :-) http://www.modelavionics.com/skytach.asp |
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