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#9
April 15th 05, 10:14 PM
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One of aviation's Rules of Thumb...
an approximate best approach speed is found halfway between the top and bottom of the white arc. Cockpit Colin wrote: Something that's always worked for me ... Take Vso (bottom of white arc) - reduce it by 5% for every 10% under MAUW then multiply it by ... 1.3 for over the fence speed 1.4 for Base 1.5 for downwind Works for all aircraft I've flown (although I add a bit in C172 - Vso (adjusted) can be as low as 28 knots - so at 28 * 1.3 (approx 37) it still hasn't stalled, but controls are getting pretty mushy (any people who bring them over the fence at 65 to 70 wonder why they float!) 
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