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Model Forum / Radio Controlled / Air Models / November 2006Great Lakes special
I built a 1/6th great lakes special a number of years ago, from a plan from Model world (I think it is a Gordon Whitehead design). It has always been a bit of a handful, with a fast flying speed due to its weight. Recently it has developed a strange behaviour which occurs when I loop it. when it gets to the top of the loop it proceeds to roll out left, unless I compensate with right aileron. This happens most of the time, but seems worse some days rather than others, and full power tends to get rid of the problem. I have checked the elevator as it is a split one with a join, but this seems fine. Can anybody offer an explanation PS This is what the Great Lakes looks like, but this is not mine http://www.beaulieugarage.co.uk/stock/lakes/index.html Sounds like it is stalling at the top of the loop? Other than that, have you checked to ensure all flight and control surfaces are full intact and have no untoward slop? Chris > I built a 1/6th great lakes special a number of years ago, from a plan from > Model world (I think it is a Gordon Whitehead design). [quoted text clipped - 15 lines] > PS This is what the Great Lakes looks like, but this is not mine > http://www.beaulieugarage.co.uk/stock/lakes/index.html Sounds like it is stalling at the top of the loop? Other than that, have you checked to ensure all flight and control surfaces are full intact and have no untoward slop? Chris All surfaces feel OK, but stalling at the top seems correct. I have added 30 grams of lead onto the interplane strutt on the right hand side, so that when it does stall, it might fall a bit strighter, and not as dramitcally to the left. Any way I will try it like that tomorrow all being well. Paul > All surfaces feel OK, but stalling at the top seems correct. I have added > 30 grams of lead onto the interplane strutt on the right hand side, so > that when it does stall, it might fall a bit strighter, and not as > dramitcally to the left. The problem with that is that although it might make any stall at the top of a loop straight it'll be a swine every time you pull any G, like at the bottom of the loop. Assuming that the thing was laterally balanced properly before you added the weight, that 30g will multiply up quite rapidly and as it's on an interplane strut and quite well out to the side of the CofG you'll soon get fed up with having to give it a fist full of opposite aileron avery time you manoeuver. Best bet is to check for a warp having crept into either the wing or the aileron and/or (but mostly and!) polish up the flying a bit so that you don't stall at the top of the loop. Steve > All surfaces feel OK, but stalling at the top seems correct. I have added > 30 grams of lead onto the interplane strutt on the right hand side, so > that when it does stall, it might fall a bit strighter, and not as > dramitcally to the left. The problem with that is that although it might make any stall at the top of a loop straight it'll be a swine every time you pull any G, like at the bottom of the loop. Assuming that the thing was laterally balanced properly before you added the weight, that 30g will multiply up quite rapidly and as it's on an interplane strut and quite well out to the side of the CofG you'll soon get fed up with having to give it a fist full of opposite aileron avery time you manoeuver. Best bet is to check for a warp having crept into either the wing or the aileron and/or (but mostly and!) polish up the flying a bit so that you don't stall at the top of the loop. Steve With the weight added the model is a lot better to fly. All aspects have now improved and the landing speed is down to a more acceptable speed. I can still not see any warps in any of the surfaces, but with a slow speed "over the top" and no added right aeileron I still get a left roll to correct way up, which looks perfectly natural to anybody watching, but of course feels very un natural to me as I am not telling it to do it. The model is of a size which I do not have to strip it down to transport, so may dismantle and investigate further. I am of course a perfect flyer so no brushing up required ;-) Paul >I built a 1/6th great lakes special a number of years ago, from a plan from >Model world (I think it is a Gordon Whitehead design). [quoted text clipped - 15 lines] > PS This is what the Great Lakes looks like, but this is not mine > http://www.beaulieugarage.co.uk/stock/lakes/index.html I wonder if one of the wings (or even both) have warped a little so that when the airspeed drops it tip-stalls?  SignatureDave (Sgt. Pepper) Epsom, England Nikon D2X / D2Hs / D2H / D100 / Coolpix 5700 My photo galleries at http://www.pbase.com/davecq "I will not tolerate intolerance ... Doh!!" >I built a 1/6th great lakes special a number of years ago, from a plan from >Model world (I think it is a Gordon Whitehead design). [quoted text clipped - 15 lines] > PS This is what the Great Lakes looks like, but this is not mine > http://www.beaulieugarage.co.uk/stock/lakes/index.html I wonder if one of the wings (or even both) have warped a little so that when the airspeed drops it tip-stalls? SignatureDave (Sgt. Pepper) Epsom, England Nikon D2X / D2Hs / D2H / D100 / Coolpix 5700 My photo galleries at http://www.pbase.com/davecq "I will not tolerate intolerance ... Doh!!" The wings are of very strong construction (a bit overly so I think), and they do appear true still. I have added 30gms of lead to the right wing so that when it stalls it might not fall left as badly. I am hoping to try it tomorrow. Paul You have answered your'e own question. The models requires high throttle to pull through the top of the loop due to high wing loading. As it slows down one wing is dropping due to a stall. Keep the air speed up during manouvers. > I built a 1/6th great lakes special a number of years ago, from a plan from > Model world (I think it is a Gordon Whitehead design). [quoted text clipped - 15 lines] > PS This is what the Great Lakes looks like, but this is not mine > http://www.beaulieugarage.co.uk/stock/lakes/index.html ---------------------------------------------------------------------------- ---- I am using the free version of SPAMfighter for private users. It has removed 29992 spam emails to date. Paying users do not have this message in their emails. Try SPAMfighter for free now! |
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