Jon S. Berndt wrote: > But, I'm also wondering if there is a way to obtain the same effect with a > three-dimensional table. Can someone give a detailed describption of a snap > roll? >
My understanding of a snap roll is that at some speed (probably well above traditional "stall" speed) you command a large nose up elevator deflection -- if you have enough elevator authority you can quickly force the wing to a high alpha so that the wing stalls (at a much higher than normal speed.) What happens next is very similar to a spin: one wing stalls before the other leading to a rapid roll. But in this case you have so much forward momentum that the result looks more like a traditional aileron roll. I can do this in many of my R/C planes. Just pull back the elevator to full deflection and the plane rolls almost instantly. Let go of the elevator and the plane stops rolling and recovers. From the ground it looks *very* similar to a more traditional aileron roll. I have an aerobatic sea plane with the engine mounted on a pylon above the wing. There's one move that's fun and freaky to fly it through. First I accelerate to full speed and pull the aircraft into a vertical climb, then I induce a snap roll as I'm going straight up by pulling the elevator back to maximum deflection. The result is that I'm in a snap roll/spin but heading straight *UP*. If I do this at full throttle and then feed in some extreme aileron/rudder deflection, the airplane will continue to spin upwards until it runs out of momentum and then continue tumbling very strangely in mid air before it begins to drop and the maneuver transitions into a more traditional spin. It's very freaky to watch because the engine is on a pylon above the wing so you have a strange off axis thrust line that makes the plane tumble more strangely. http://www.flightgear.org/~curt/Models/Current/Mariner40/ I should point out that I'm an average R/C pilot at best so there are a *lot* of guys that can do a lot fancier and wilder stuff than I know how to do. Curt. -- Curtis Olson http://www.flightgear.org/~curt HumanFIRST Program http://www.humanfirst.umn.edu/ FlightGear Project http://www.flightgear.org Unique text: 2f585eeea02e2c79d7b1d8c4963bae2d _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
