Thanks for your input. I have now removed all units in the sheet and still no answer. My definitions seems alright - but I get not result when doing the Wmin=
Very odd.
Another thing I need the area in dm^2 not in m^2 How would I go about that?
What do you mean by "no result?" Mathcad is unlike Matlab, so you have to specifically ask for an answer, e.g.:
Weight:1/2*airdensity*v^2*CL*A
Weight=
When you hit return on the second equation, Mathcad should display Weight=90000 or whatever.
dm is a non-standard unit in Mathcad, so at the top of the sheet, define dm:0.1m
then you can use dm as any other regular unit. Be careful not to redefine built-in units, as that can have disastrous effects on other dependent units in your calculations.