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-- "Andrew Boyd" wrote in message m... wrote: So if I normally commence a loop at 100 knotts but get the entry speed wrong and start at 105 knots .... Anyone care to formulate what happens when speed ( or "G") are not constant? Your speed and G are NEVER constant during a loop. A vertical maneuver is always low and fast, then high and slow, then low and fast again, etc. You continually convert your kinetic energy at the bottom, to potential energy at the top, then back to kinetic energy on the downline. A hhead (aka stall turn) is a perfect example of this. You go straight up until you stop, then pivot, and fly down and gain airspeed again. Given a constant density altitude, additional entry speed implies additional G to make the same radius, assuming you fly at (or near) the stalling AOA which generates Clmax. Think of it this way: given that you fly at Clmax: 1) the radius of the vertical maneuver is a function of the aircraft stall speed (Vs), and 2) The G you must pull or push is a function of the entry speed. Does that make sense? It's not completely true - it will not withstand a rigorous proof, but practically speaking, it's what you really need to know to yank and bank down low. Thanks for the informative posts. I wish we had more discussion on this newsgroup about the physics of aerobatic flight. Here is an interesting article in Air Force Flying Safety regarding optimizing the pullout in an altitude-critical situation. I found it very interesting reading and perhaps relevant to this discussion. http://afsafety.af.mil/magazine/htdo...98/pullout.htm Cheers! -justin yak52 driver |
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