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Old 09-28-2019, 05:13 PM
  #78  
quorneng
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Join Date: Jul 2008
Location: Cheshire, UK
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aaindthu
Most definitely keep building & posting!
It is worth remembering that long wing span gliders do not respond to rudder only commands particularly fast, there is simply too much inertia, particularly if you have an electric motor on the end of a long nose!
Even when the rudder has made the glider yaw your relatively slim fuselage has limited side area so the glider will tend to skid sideways rather than turn. The yawing motion and wing dihedral will make the glider bank but the relative heavy long span wings will only do so slowly.
You can see that much of your current design has conspired to make the glider slow to respond to rudder commands. I can assure you that full size high performance gliders don't turn well on a rudder only input either!

Ailerons are a much better solution if you intend to keep 'long' wings as even quite small ailerons placed out towards the wing tip will provide a positive bank action. With a slim fuselage 'bank' is a primary requirement to initiate a turn.
However using ailerons is not all 'sweetness and light' as particularly on long wings they can cause a yaw in the opposite way that you want to turn. This effect get more and more pronounced the more aileron you apply, however it is only a transient effect as once you have set the required bank and centred the ailerons the natural correcting effect of the fin will straighten the yaw and the glider will continue to turn normally. Remember also if you are turning with any sort of bank angle you will have to use some opposite aileron to get the wings back level again to end the turn.
So 'aileron only' turns are much more positive than 'rudder only' but their very effectiveness and secondary effects can cause problems (a crash!) if used excessively when flying low and slow - typically the final turn before coming into land in windy conditions!

In your case removing the weight of the rudder servo in the tail is probably wise to reduce the length of the nose but do use a generous fin to provide good natural yaw correction.
It would also pay to move the battery as close to the motor as possible to also reduce the nose length. In fact keep construction of the whole rear end as light as possible so it can be as long as possible even if it that means it becomes a bit 'delicate'. The better a plane flies the better are the landings.

I look forward to seeing how it turns out.



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