Date: 30 Mar 99 01:53:45 From: email@example.com (GDLPILOT) Organization: AOL http://www.aol.com References: 1
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Good question - and rather unusual since it is normally given as a single value. However, I would guess that since the ability to maintain good lateral control is the determining factor, and since the amount of lateral 'force' available is a fuction of airspeed, the condition is most critical at low airspeeds since aileron effect will be less at low speeds. It is probably a case that since the minimum operating airspeeds increase with aircraft weight - consequently, the amount of aileron effect at the minimum speed is greater, at a greater weight. Therefore, the maximum allowable imbalance increases. Another way to look at it, is that the imbalance is really a function of airspeed since that determines aileron effectiveness. The higher the speed, the more imbalance you can handle. If you get very low airspeeds - such as you would have at light weight conditions - you reach have reduced aileron authority and cannot support as high an imbalance.