From: "Adam Woolley" <[EMAIL PROTECTED]>
* I thought that all I'm interested in was the IAS, but how does the TAS
come into it..? To balance it all out I suppose..
Adam, IAS isn't actually a speed. It's the 'speed' equivalent of the
dynamic pressure the aircraft is experiencing. Glide angle is real distance
forward divided by real height lost. You need TAS to get real distance
forward. For that you need temperature and altitude as well as IAS.
Horizontal speed is the less error-prone one to measure so GPS runs in
opposite directions may be accurate enough in a fairly low wind sky - which
it needs to be if you're going to be sure there's no significant vertical
air movement. Probably as accurate as the tedious conversion process from
IAS to TAS with at least four error-prone variables needed to make the
conversion.
Cheers,
Graeme Cant
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