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To try and keep on point here, LS-6, LS-10, LS-3, PIK 20 D, Ventus C,
ASW-17 come to mind as having full span flaperons. The entire trailing edge moves the same amount when moved as flap or aileron. ASW-20, PIK 20B, Zuni, SGS 1-35, HP Series, 301 Libelle, Diamants, Ventus A/B, Kestrel, etc do NOT have full span flaperons. They have flaps and ailerons, and varying degrees of interconnection between the two. Only plane I know of that had a full span flap that was used at large deflections (greater than 30 degrees) was the HP-17. Notice, it did not have full span flaperons. It had spoilers for roll control. And I understand the contestants had a great time watching Schreder take off with it, as he went from tip to tip, side to side on the runway until he finally got the plane into the air. This was likely due to the fact that you could only reduce the lift a bit on the high wing and add drag to it to try and pick up the down wing. Full span, large deflection flaperons will likely provide very poor roll control at any deflection beyond about 30-45 degrees, as the flap will be likely be stalled, and the main thing you will get is differential drag or a yawing moment when you moved the stick to try and roll the plane. Oh, and I don't consider the Ventus A/B, Mini Nimbus, or Mosquito to have drag flaps. They have cruise flaps and trailing edge air brakes. Drag flaps have you looking out the top of the canopy at where you are going to land when you put them full on. You are still looking out the front of the canopy at where you are going to land with trailing edge air brakes. The ASW-20 was the first to get the ailerons back up as the flaps went on down, getting the plane into what a previous poster said is called "crow mode" in the model world. I think the biggest thing it does is makes it so the ailerons won't stall once you are on the ground in two point, tail low attitude. I don't think it was done for added drag or improved in flight handling. You already get ENORMOUS geometric twist when your inboard flap is down 50 degrees and your ailerons are still down 8. However, these flapped ships like to have the ailerons up when sitting two point on the ground in order to have aileron authority, and Schleicher got this (among so many other things) right by putting them back up so you can leave the flaps all the way down after you land. That way, your left hand doesn't have to keep jumping around in the cockpit grabbing different handles. Set the flaps, use the dive brakes and land. No more needed hand changes. Steve Leonard |
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