20-09-2013, 03:45 PM
(19-09-2013, 10:42 PM)Steven Wrote: Spoilerons - is a little bit of that a positive method of aiding in the decent of a large(ish, it's all relative) model when the wing structure pretty much rules out adding flaps?
What's the detractors and any undesirable side effects of using a spoileron function?
It will depends on how your ailerons are set up. If the ailerons are pretty much full length of the wing it should work OK, If the ailerons are out towards the tips like a T28 it should also work OK. This is like adding "wash out" but if they are in near the root and you raise them it can be like adding "wash in" and that's not good.
Wash out = lower angle of attack at the tips = not likely to tip stall
Wash in = higher angle of attack at the tips = likely to tip stall
Deploying spoilerons will change the camber of the wing and make it less efficient and that will make the model more dragy and it will loose height and wash off speed quickly.
Because it will change the angle of attack of the wing you will probably have to compensate with a change of elevator trim. The tricky bit is finding out how much, once you do that and mix it in to the elevator then it should work properly. Another thing you will probably find is that, with spoilerons deployed the speed range of the model gets quite a bit narrower. So you will have to fly it slow with spoilerons deployed or it will zoom.
What I usually find happens is I accidently launch with spoilerons deployed and because I'm going fast it zooms then I add a heap of down trim and wonder why it's still flying weird. Then I realise I've been flying with spoilerons deployed and I need to re-trim.
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