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spins from coordinated flight
Can you depart and spin from coordinated flight? Specifically a coordinated
climbing turn? Several weeks ago I chimed in on an otherwise awful thread suggesting that if the ball was in the center the airplane would not spin. One of the posters ) responded that the difference in relative wind between the inside/outside wing during a climbing turn would result in an assymetrical stall and wing drop even in coordinated flight. He had several Canadian/Australian citations to back it up. He posted summaries of them originally and my apologies for re-constructing them: Full power stalls in a balanced climbing turn tend to result in the outer wing stalling first, because of the higher aoa of the outer wing, with a fairly fast wing and nose drop (particularly so if the propeller torque effect is such that it reinforces the roll away from the original direction of turn and the aircraft is a high wing configuration) and likely to result in a stall/spin situation that any pilot lacking spin recovery experience may find difficult to deal with. If the climbing turn is being made with excessive bottom rudder then the lower wing might stall first with the consequent roll into the turn flicking the aircraft over. Recovery from a stall in a climbing turn is much the same as any other stall - ease the control column forward to about the neutral position, stop any yaw, level the wings and keep the power on. http://www.auf.asn.au/groundschool/u...ml#climb_turns When the aircraft stalls in a climbing turn, the high wing is at a greater angle of attack than the low wing and therefore stalls first, which results in a rolling motion toward the high wing, creating asymmetric lift and drag. The down-going wing will stall further as a result of less lift and more drag than the up-going wing. A deeper stall, generated by aft C of G, will aggravate these asymmetries, increasing aircraft rolling and yawing moments into the down-going wing. In addition, the aft C of G reduces the distance from the C of G to the centre of pressure of the vertical fin, thus reducing directional control authority, making recovery more difficult http://www.tsb.gc.ca/en/reports/air/...p?print_view=1 In a climbing turn, the outside or upgoing wing is meeting the relative wind at a slightly higher angle of attack than the lower wing. If we pull on the column to the stalling bite, then the upgoing wing will reach it first...The upgoing wing suddenly drops and the wing falls away from the original direction of turn. http://www.casa.gov.au/fsa/2000/sep/FSA34-35.pdf The Transport Canada Guidelines on Stall Training and Spin Awareness specifically requires demonstrations in coordinated climbing turns: http://www.tc.gc.ca/civilaviation/ge...stalltrain.htm I would have thought that the hamfisted chandelles I perform would have flirted with disaster if this were the case. However while I have had to demonstrate accellerated stalls from 20 degree banks, I cannot recall having to deliberately stall the airplane from a climbing turn. My question to uunet is; can you spin from coordinated flight? Regardless the previous dialog did get me thinking: The convergence of insufficient right rudder and a slipping turn, the left turning tendencies and the assymetrical stall could gang up on our hapless pilot resulting in a quick snap and spin during a climbing right turn away from obstacles in the departure path. Regards Todd -- "Instrument flying, I had concluded, is an unnatural act, probably punishable by God." --Gordon Baxter |
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