There's a QBasic compiler to download there as well. One you've got
that you can see all the equations in the program.
I estimated thrust from prop data I obtained from one of the
manufacturers - you're close enough with prop efficiency.
Approx drag deduced from a rough drag polar analysis of published info
for max level speed and climb. All the data is in the program for
several aircraft types.
Have you got MS FlightSiM? It works pretty well and should give you
what you want too. We've set it up at our flying school - if it gets
much better I might give up real flying.
You can contact me direct via www.ozaeros.com

"Dave" wrote in message ...
Thanks Dave - I've downloaded it. How do you estimate thrust and drag?
It's many years since I wrote any Basic, what do I use to run it?

Dave S