Yes, i know L=W in level flight. Therefore given the weight i could calculate Cl.
But say I was doing a calculation to figure out what velocity i would need to be at in order to take off where L is slightly greater than W, say 110% of W. Obviously I know Rho, and also assume i know A, and W, and hence i also know L. I am left with two unknowns in the equation, v and Cl, since I am calculating v, surely i need a value of Cl right?
Regards
neorich2002