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

"Dave Pilkington" wrote in message
om...
Dave,
I have a simple Qbasic program to do just that - it can be downloaded
from:
http://groups.yahoo.com/group/ozaeros/files/Technical/
You'll need to register with that Yahoo group to get access.

Regards,
Dave Pilkington

"Dave" wrote in message
...
I've been teaching aerobatics for years but last weekend (after a
session of
stall turns) a student said he was surprised at how long we were
vertical.
Afterwards it occurred to me that it would be fun/interesting to look at
the
sums, later I realised that I didn't know how to DO all the sums!!