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Model Forum / Radio Controlled / Air Models / May 2005Flair Extra spare needed
Long shot but worth a try ! Son managed to lose the aileron from the left wing of his Extra 300 140 today and it landed somewhere in the middle of a field full of crops. Extensive search (4 hours!) didn't manage to find it. Anyone know where I might get one from? Either side would do as it's just the colour that's different. Flair Direct only seem to sell the entire wing and that's a bit much for just an aileron! Alternatively would it be safe to make/carve one out of solid balsa as I have the other one to get the sizes etc? And he managed to land the plane fine with just one aileron! TIA cheers, Len > Long shot but worth a try ! Son managed to lose the aileron from the > left wing of his Extra 300 140 today and it landed somewhere in the [quoted text clipped - 11 lines] > cheers, > Len Get the "David" plane out and go to work ....the summer might not last long.In the 4 hours you looked for it you could have made one!!!!!! Have fun. Especially on that size/speed model be careful that the aileron is constructed in a similar way to the original. If you make, for example, a solid aileron and the original is built up, you might get flutter problems (a model breaker) if there's a significant mass difference from the original design. What can happen is that a deflection due to air pressure can go a little further due to the extra mass of the aileron, deflecting back, again due to air pressure, which goes a little further, again due to the mass etc. etc. until it breaks either the hinges, structure, linkage or servo gears. Best case scenario is losing an aileron and worst case the whole model. > Long shot but worth a try ! Son managed to lose the aileron from the > left wing of his Extra 300 140 today and it landed somewhere in the [quoted text clipped - 11 lines] > cheers, > Len >Especially on that size/speed model be careful that the aileron is >constructed in a similar way to the original. If you make, for example, a [quoted text clipped - 21 lines] >> cheers, >> Len I am going to make the replacement exactly the same size as the original. Not sure what the original was made of but how much difference in mass (I'm assuming weight?) before I get the problems you mention (flutter?) I have examined the remaining aileron and I'm pretty certain that it isn't made up as there are no visible former lines and it feels solid over the entire surface. Quite possible however that it could be veneer covered foam - how much difference would that make if I make the replacement from solid balsa? What if I was to replace both with solid balsa, making them both the same mass? cheers, Len > On Mon, 30 May 2005 19:07:14 +0000 (UTC), "Martin" > I am going to make the replacement exactly the same size as the [quoted text clipped - 9 lines] > cheers, > Len Might be best to do it that way Len, It doesn't take long to make a pair up and at least you can be assured of correct balance etc between the pair then.  SignatureRegards........Mark (BlueWaveStudios) www.scale-models.co.uk (Moderator) Len, Weight is basically the same as mass at 1g (gravity) - mass gets a little more relevent when g loading is increased or decreased. It's not so much a case of getting both the same weight (although you should be safe if it comes out the same as the original and the model will fly aerobatics much better if the whole thing is balanced laterally). In all probability you'll be OK so long as there's no excessive play anywhere in the linkages and no excessive gaps between the trailing edge and the aileron. It's just that the Extra 140 is a large and fast model and the bigger and faster they get, there's more chance of flutter due to imbalance. In the full size world, all control surfaces are mass balanced with counter-balance weights - sometimes visible from outside the wings on some light aircraft and sometimes in the leading edges of the control surfaces with hinge points set back into the surface on its C of G. So long as the new aileron is fairly close in weight to the old one you'll probably be OK but I'd be careful at high speed until you've established that it doesn't flutter. Once heard, you'll always recognise the sound so test it carefully and shut the throttle immediately you hear any "machine gun" noise and ease out of any dive you're in to slow down as soon as possible. If you do experience flutter, land as soon as possible and check the hinges, linkages and servos carefully before flying again. Martin > >Especially on that size/speed model be careful that the aileron is > >constructed in a similar way to the original. If you make, for example, a [quoted text clipped - 34 lines] > cheers, > Len >Long shot but worth a try ! Son managed to lose the aileron from the >left wing of his Extra 300 140 today and it landed somewhere in the [quoted text clipped - 11 lines] >cheers, > Len Thanks for all the advice. Contacted the 'new' Flair today and under normal circumstances they could have sent me a replacement but the factory is empty apparently and I would have to wait between 4-6 weeks for it! Have decided to take the remaining one off to put stronger hinges on and then use that to make sure the replacement one is exactly the same weight to avoid any problems. Should have it ready for the weekend with luck so I'll post the results of the next flight! cheers, Len |
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