Andy Blackburn writes:

There are two main challenges with using flight logs only:

1) There is no good source for IAS, so you have to try to estimate
it from GPS ground speed.

2) Typical soaring flights don't involve adequately calm vertical
airmass movement and probably not constant enough airspeed to trust
even long glides of many tens of miles.

You really need a different logger, that records raw GPS carrier phase,
plus static, pitot and temp. And Alpha vane would also be a big help.
Also you would want to run at 10 sample/sec or possible more.

If you go to this much trouble, you may as well ues 3 sets of GPS and
can then extract full position, attitude, and velocities as well.

--
Paul Repacholi 1 Crescent Rd.,
+61 (08) 9257-1001 Kalamunda.
West Australia 6076
comp.os.vms,- The Older, Grumpier Slashdot
Raw, Cooked or Well-done, it's all half baked.
EPIC, The Architecture of the future, always has been, always will be.