Adam Lomax Posted December 12, 2009 Share Posted December 12, 2009 hi i had the second maiden flight of my excelsior (if thats possible), and it went successfully. But we had one problem wich was when we got it into trim. It went fine for a few minutes, but then it would change and need re trimming and after another few minuets it would change again. i am assuming this is somhing to do with the radio, and not the airframe. im using a futaba ff9 and a r149dp reciever. i dont think its because the servos arn't centring properly because we tested that and it is fine. and it is only affects the ailerons. any help is appreciated Adam Lomax Quote Link to comment Share on other sites More sharing options...
Dusty Posted December 12, 2009 Share Posted December 12, 2009 What was the air like? Quote Link to comment Share on other sites More sharing options...
kc Posted December 12, 2009 Share Posted December 12, 2009 Could check the wing bolts or bands are secure and the torque rods are tight in the aileron balsa. Then swap aileron servo for rudder servo and see if the problem changes to rudder. What is the history of the radio gear? Battery? Quote Link to comment Share on other sites More sharing options...
jez Posted December 12, 2009 Share Posted December 12, 2009 hi adam , i have had a simlar fault on a miss glued hinge on a ripmax spitfire and at the time you couldnt see any problem , took some finding , even changed servo too before re setting hinge , had got a bit of cyno in the bendy bit !!!! regards jez Quote Link to comment Share on other sites More sharing options...
ken anderson. Posted December 12, 2009 Share Posted December 12, 2009 hello adam-if your convinced it is for sure losing it's trim i would try a different rx-if that doesn't cure it i would change the aileron servo's...i assume that the wing is fastened down ok?...as a last resort-check there is no slop in the control's(maybe make that first).. ken anderson.............. Quote Link to comment Share on other sites More sharing options...
kc Posted December 12, 2009 Share Posted December 12, 2009 Could also check that the ailerons are not catching at the ends. If it is a torque rod setup with the servo projecting instde the fuselage check that nothing fouls the servo arm or pushrods under any conditions. Quote Link to comment Share on other sites More sharing options...
Adam Lomax Posted December 12, 2009 Author Share Posted December 12, 2009 thanks for all of the input guys just had a look at the ailerons one of them does rub at the end (supprised i hadnt noticed before) so im going to fix that however the servos have 10kg of torque and there is only a very small amount of slop (you have to really look) so i doubt that may be the cause we will have to see!Edited By Adam Lomax on 12/12/2009 20:20:03 Quote Link to comment Share on other sites More sharing options...
Dusty Posted December 12, 2009 Share Posted December 12, 2009 What control rods/horns you using? On my big Yak I changed them so the rods where shorter, ball ends on both ends, used Ali servo horns and I they take some force (7kg servo @ 4.8v) to get them to buzz as before with the standard supplied hardware! If your aileron is rubbing the wing might have warped since you built the model, maybe consider temprature changes and how you store you goodies? Quote Link to comment Share on other sites More sharing options...
colin watson Posted December 12, 2009 Share Posted December 12, 2009 hi adam i came across the same thing last week and found flutter in one elevator after investigation i found it was my 3mm metal clevis jumping threads on the 3mm threaded rod cyno stopped it although i now have no mechanical adjustment Quote Link to comment Share on other sites More sharing options...
Adam Lomax Posted December 12, 2009 Author Share Posted December 12, 2009 that could be something, i am using 3mm metal cleveses and 3mm threded rod. and the ailerons are the only surface im using them on. i am using fairly substantial plastic horns just realised i wasted my 100th post (only joking)Edited By Adam Lomax on 12/12/2009 21:41:11 Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted January 5, 2010 Share Posted January 5, 2010 Are you sure that they are both 3mm......we get both clevises & threaded rod with US sized threaded on 'em & if you mix a 3mm & a US thread they seem to work but give up under duress!!!Edited By Steve Hargreaves on 05/01/2010 12:28:43 Quote Link to comment Share on other sites More sharing options...
Former Member Posted January 5, 2010 Share Posted January 5, 2010 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
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