colin watson Posted July 10, 2010 Share Posted July 10, 2010 I AM EXPERIENCING EXTREME WING FLUTTER THIS ISN'T CAUSED BY OVER POWERING I HAVE NO SLOP BETWEEN AILERONS AND SEVOS ALSO SEALED BETWEEN WING AND AILERON Quote Link to comment Share on other sites More sharing options...
Ultymate Posted July 10, 2010 Share Posted July 10, 2010 What servos are you using? P.S. turn your caps lock off capitals are the equivalent of shouting in computer speak Quote Link to comment Share on other sites More sharing options...
colin watson Posted July 10, 2010 Author Share Posted July 10, 2010 i have used tower pro 995's Quote Link to comment Share on other sites More sharing options...
Ultymate Posted July 10, 2010 Share Posted July 10, 2010 I've just checked they're rated at 10Kilo but they don't say at what voltage, the servos being tolerant of 4.8 --7.2V. Is there any sign of slop in the servo gear trains and are you using good quality horns and linkage? Quote Link to comment Share on other sites More sharing options...
colin watson Posted July 10, 2010 Author Share Posted July 10, 2010 its not the sevos or linkages i am running 6v the movement is at the wing mounting i can rock the wings easily about 1" in all directions Quote Link to comment Share on other sites More sharing options...
Ultymate Posted July 11, 2010 Share Posted July 11, 2010 OK how are the wings mounted then, is it single piece wing or two piece, if two piece how are they joined and secured in place on the fuselage? Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted July 11, 2010 Share Posted July 11, 2010 One solution- Mass balancers about 2/3 of the way from the wing root on the ailerons . Probably about the same place as the servo connections are .A club member years ago had a very high speed ic pusher prop delta that the problem was only cured this way . You could hear it at times on a flypast -Quite frightening! Not sure of your a/c size but I think someone else will be able to suggest weight /dimns /overhang etc . A lump of "church roof " on piano wire about 1/2 oz at about 1" from the hinge line probably -facing forward by 1" might be a good starting point .Using piano wire enables you to move the lead/solder blob if not quite right first time .As I say ,I'm sure there's someone out there that knows more about it . Hope this helps ( I believe the full size has these fitted as do most RedBull air race participants) Myron Quote Link to comment Share on other sites More sharing options...
colin watson Posted July 11, 2010 Author Share Posted July 11, 2010 the wings are 2 peice on a carbon tube then a plastic bolt to hold them in place Quote Link to comment Share on other sites More sharing options...
colin watson Posted July 11, 2010 Author Share Posted July 11, 2010 photo shows gap at wing mount with gentle rock of wing this the aircraft in question the wing mounting Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted July 11, 2010 Share Posted July 11, 2010 Colin Well if you have a gap. Fill it ! Quote Link to comment Share on other sites More sharing options...
colin watson Posted July 11, 2010 Author Share Posted July 11, 2010 ha ha nice idea this is the flex in the mounting it ends up being about 1" at the wing tips alternateley i could use polyfiller Myron Quote Link to comment Share on other sites More sharing options...
Alan Posted July 12, 2010 Share Posted July 12, 2010 hi Colin I have been looking to get this plane for a while from YT international apart from your recent problem with it. What do you think of the palne and what engine did you put in it and did you have any problems with the build. Alan Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted July 12, 2010 Share Posted July 12, 2010 Is there up and down play as well? That would indicate the wing joiner being too loose a fit but a single bolt fitting per side doesn't really seem to be an adequate fixing - particularly on a largish model - seems a recipe for allowing movement which will promote wear in the fittings. I wonder if the incidence pegs are intended to be shimmed? Have you discussed the problem with YT? Quote Link to comment Share on other sites More sharing options...
colin watson Posted July 13, 2010 Author Share Posted July 13, 2010 i am in contact with yt i contacted them last week still awaiting a solution.i had to again contact today to answer alans question i fitted a os110fsa though it will be re engined if the flutter is sorted out. if you buy one depending on what engine you use beware it is tail heavy i should of used one tail servo i have added 1.5 kg to the front and it is still tail heavy i will now build a lead mounting plate to be added to engine box to bring the weight further fwd. i will re engine with either a 26cc petrol for its weight or a os120as for its power . my personal thoughts are a design fault it should of been fitted with two wing tubes and two retaining bolts or a more substantial wing tube and two retaining bolts the fuzz wing mounts require beefing up to remove the flex Quote Link to comment Share on other sites More sharing options...
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