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![]() "Stealth Pilot" wrote in message ... On Mon, 22 Sep 2008 14:10:50 GMT, Robert Moore wrote: Stealth Pilot wrote Sideslips are a very useful tool because they allow you to substantially increase the drag, which makes you descent like a plumbers toolbag, but doesnt change the forward speed. so you have no increased risk of stalling as you wash off the height. What you have described is the "forward slip". Although control usage is the same in both, a "side slip" is used to correct for a crosswind, and a "forward slip" is used to descend more rapidly on final without having the airspeed increase. If one is not landing, I suppose that it would just be a "slip". Airliners normally do not use either because of the increased discomfort caused the passengers....both being uncoordinated flight. Amine wrote: PS: I have read about many cases of jetliners that had to make emergency descents at abnormally high speeds, but the AC143 seems the only one to have used the sideslip. AC 143 was constrained by "touchdown speed" runway length. An "emergency descent" has no such constraint and therefore is able to use the aircraft's maximum certificated speed for the descent...far in excess of what would be possible in an approach/landing situation. In an engine failure situation, keep it as high as possible for as long as possible to insure that the field can be reached, and then slip as much as required to lose the excess altitude without gaining airspeed. Bob Moore Flight Instructor ASE-IA ATP B-707 B-727 PanAm (retired) in my country the manouver I describe is always called a side slip. side slips are used as I indicate to dirty up the aircraft aerodynamically. they can be used to counter a crosswind but the crabbed approach is preferred because it doesnt change the approach profile. it is a side slip. youalls mileage may vary :-) Stealth Pilot The slips are named for their flight path in relation to a point on the ground. The forward slip, when used in relation to a runway, creates a direct forward path to the end of the runway. This is accomplished by lowering a wing and opposite rudder at the same time. The nose of the aircraft is to the left or right of the runway heading but the flight path is directly forward toward the runway. The primary use of this slip is to lose altitude without increasing airspeed and also to allow a view of the runway if the front windshield is obstructed with ice or oil. The side slip, when used in relation to a runway, creates a sideways flight path . This is accomplished by lowering a wing and using rudder to keep the nose of the aircraft pointed straight down the runway. In a no-wind situation the aircraft will move sideways left or right of the runway centerline depending on which wing is lowered. The primary use of this slip is to counteract side drift in a crosswind landing and allow the aircraft to touchdown parallel to the runway centerline. -- *H. Allen Smith* WACO - We are all here, because we are not all there. |
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