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Model Forum / Radio Controlled / Helicopters / October 2003Open reply to Beav
Beav, re re-phasing my Sceadu 50...worked a treat thanks. Putting the top swash balls half a ball clockwise of the lower balls has cleaned the pitch command of any rolling. Secondly, using 555mm blades rather than 560 / 600 ones with my OS 46 hs also improved things. I increased all throws like you saiad and now have good aerobatic control in all axis - I have added -30% expo on roll and pitch. It still rols slower to the left then right, but I am experimenting with assymetric expo. I have uncovered a tendancy to diverge to the right in roll, so maybe a bit time setting up the roll linkages is needed. The tail is also quite weak, so I am getting 80mm blades to see if they do the trick. Anyway, she's a little star now and I am having immense fun - thanks Beav for the advice during this ongoing learining process. David > Beav, re re-phasing my Sceadu 50...worked a treat thanks. Impossible. I'm a fossil and I know f.ck all about heli's, so you're imagining it. Putting the top > swash balls half a ball clockwise of the lower balls has cleaned the pitch > command of any rolling. Good. (I "suspected" it would, but you DO understand it was only a guess don't you? :-) > Secondly, using 555mm blades rather than 560 / 600 ones with my OS 46 hs > also improved things. Keep the 600's though for the time when (if) you ever fit a 50. With the 555's you'll have real problems keeping the head speed under control. > I increased all throws like you saiad and now have good aerobatic control in > all axis - I have added -30% expo on roll and pitch. At one time I didn't use Expo, but nowadays I do. It serves to slightly soften the intitial stick movement, but still allows for full deflection for extreme manoeuvring. > It still rols slower to the left then right, but I am experimenting with > assymetric expo. If you're using full roll control to roll, it's not asymmetric expo you should be looking at, it's either asymmetric ATV or even using a slight off-set on the roll servo output arm that favours the left roll. > I have uncovered a tendancy to diverge to the right in roll, so maybe a bit > time setting up the roll linkages is needed. Confused in Bolton asks "which way do you WANT it to diverge during a roll? :-) Or are you experiencing a right TAIL rotor divergence? > > The tail is also quite weak, so I am getting 80mm blades to see if they do > the trick. What gyro/gain setting/limit settings/ATV values are you using? > Anyway, she's a little star now and I am having immense fun - thanks Beav > for the advice during this ongoing learining process. Start thanking me and people mught get the wrong idea and think I might be able to help THEM, and they'd be MUCH better off seeking American help:)  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 > Confused in Bolton asks "which way do you WANT it to diverge during a roll? > :-) Or are you experiencing a right TAIL rotor divergence? Sorry, I meant that in straight and level forward flight the machine tries to roll right. > What gyro/gain setting/limit settings/ATV values are you using? Gain (CSM400) 5% (normal)/ 90% (HH) But the gyro mis way off being sorted. When I hit HH it very gently, but quite positiviely, turn left. A full 360 to the left would take about a minute, so its slow. Buggered if I can stop it yet though. I keep experimenting with push rod length (by sliding the servo up and down the tail boom) ATV aileron 140 / 110 David >> Confused in Bolton asks "which way do you WANT it to diverge during >> a roll? :-) Or are you experiencing a right TAIL rotor divergence? [quoted text clipped - 5 lines] > > Gain (CSM400) 5% (normal)/ 90% (HH) FM you must have a pretty smooth setup if you can have 90% HH gain and no tail wag. Most people can't go above 65%-ish AFAIK. > > Gain (CSM400) 5% (normal)/ 90% (HH) > > FM you must have a pretty smooth setup if you can have 90% HH gain and no > tail wag. Most people can't go above 65%-ish AFAIK. Carl, I DO hve tail wag! Very slight, but present. Removing that is next on the list!! I am having trouble getting the gyro sorted at all, mainly because of the different trim between the HH and Normal modes. We'll get there!! David > > > Gain (CSM400) 5% (normal)/ 90% (HH) > > [quoted text clipped - 4 lines] > > I DO hve tail wag! Very slight, but present. You can stop that with either of two things. A touch less gain or a touch less blade. If you're using NHP tails, sand a couple of millimetres off 'em and try again. Removing that is next on the > list!! I am having trouble getting the gyro sorted at all, mainly because > of the different trim between the HH and Normal modes. We'll get there!! See my previous Dave. 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 > >> Confused in Bolton asks "which way do you WANT it to diverge during > >> a roll? :-) Or are you experiencing a right TAIL rotor divergence? [quoted text clipped - 8 lines] > FM you must have a pretty smooth setup if you can have 90% HH gain and no > tail wag. Most people can't go above 65%-ish AFAIK. The idea is to get as close to 100% as possible Carl, which normally means experimenting with blade length and chord. Seems like Dave hit on a pretty good blade already. No point having a gain setting that reaches 100% and only using 65 of 'em. 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 > Secondly, using 555mm blades rather than 560 / 600 ones with my OS 46 hs > also improved things. Keep the 600's though for the time when (if) you ever fit a 50. With the 555's you'll have real problems keeping the head speed under control.>>>>>>>>>> I have problems keeping the headspeed under control with my 600 V blades, with an OS 50 and pipe setup. > > Secondly, using 555mm blades rather than 560 / 600 ones with my OS 46 hs > > also improved things. [quoted text clipped - 4 lines] > I have problems keeping the headspeed under control with my 600 V blades, with > an OS 50 and pipe setup. Yeah, most people do Doug. The 50's are more powerful than the 60's of 10 years ago and even THEY were hauling 64cm blades around without much bother, AND dragging a 60 sized heli along for the ride too. 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 |
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