Airplane Calc

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.