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Here's a handy dandy flightspeed, wing area, and wingloading calculator. It handles units in Metric as well as Imperial, a feature lacking in other flightspeed calculators which is annoying since micro modeling is worldwide and units are mentioned in several formats it's hard to keep up with converting so I have made this form. The flight speed is minimum flightspeed and the formula that calculates flightspeed is based on the article in RCmicroflight by Jef Raskin. Note the flight speed calculation assumes a coefficient of lift of about 1.