"Hilton" wrote in message
nk.net...
Terry wrote:
the best glide speed of a warrior is quoted as 73 kts. but best glide
should
be at best lift /drag ratio...

It is.


which I recall is at about 4 degree angle of attack.

Who told you this? CFI? POH? Seems awful low to me; I've never seen an
AOA quote for Vbg for a GA aircraft.




The 4 degrees comes from my theory books ( trevor Thom) and I understand it
is pretty much the same for all light aircraft. which is why the wing is
usually set at this angle when the aircraft is level ( the riggers angle I
believe they call it) But since we dont have an angle of attack meter the
number is pretty much academic. the principle is that the best glide speed
is at a constant angle of attack and if the weight changes the speed to
achieve that angle of attack must change. I just wanted to understand how
much it changes.




But this must be a function of weight.

The airspeed is, not the AOA.

yes I agree, I didnt write this well but the change in airpseed is what I am
after, since we dont know tha aoa


So my questions are what weight is the 73 kts based on?

Best lift over drag as you suggest.


My flying school actually rounds it off to 75kts, regardless of weight.

Stupid. Fly 73, not 75 - if you can't fly 73, you need practise. There
are
numerous rules of thumb, to get it accurately, scale by sqrt(weight) /
sqrt(gross) - ensure you use CAS, not IAS.

Im certainly doing the practice and good pt about using CAS


Hope this helps,

It does, thanks
Terry