best glide speed of a warrior

Vx and Vy get a little more complicate with altitude change.
Vx increases with altitude, Vy decreases with altitude.

Robert M. Gary wrote:
BTW: There is a formula to get Vy, Vx, and Vso (and probably best
glide) for each weight. I don't have it in front of me right now. That
formula is on the Flight Engineer FAA written exam.

-Robert, CFI

George wrote:
d&tm wrote:

Wont the best glide speed also keep you in the air the longest? if not
what
speed will?

No, best glide doesn't do that. The best loiter speed is a bit lower than
that
for the best angle of climb. It's usually not published, but you can
determine
it pretty well by empirical experimentation.

Vms really has nothing to do with Vx. Vms minimizes power-off power loss,
Vx maximizes power-on excess thrust.

Vms is easy to calculate. It's just 76% of Vbg (make sure you do
IAS-CAS-*0.76-IAS; i.e. multiple CAS, not IAS).

Hilton

Robert M. Gary wrote:
BTW: There is a formula to get Vy, Vx, and Vso (and probably best
glide) for each weight. I don't have it in front of me right now. That
formula is on the Flight Engineer FAA written exam.

Vs is easy, but modifying Vx and Vy for weight would be a very complex
equation if done correctly since it would have to compensate for propellor
efficiency, engine efficiency, etc as the airspeed changes.

Hilton

On Tue, 14 Dec 2004 at 06:50:15 in message
, d&tm
wrote:

Wont the best glide speed also keep you in the air the longest? if not what
speed will?

Nope. Minimum sink rate is close to maximum lift AoA.
Strictly, for simple math, it is at max (CL^(3/2))/CD.

Best glide angle is at Maximum CL/CD which is usually at a lower AoA
than minimum sink.
--
David CL Francis

In article , David CL Francis wrote:

On Tue, 14 Dec 2004 at 06:50:15 in message
, d&tm
wrote:

Wont the best glide speed also keep you in the air the longest? if not what
speed will?

Nope. Minimum sink rate is close to maximum lift AoA.
Strictly, for simple math, it is at max (CL^(3/2))/CD.

If you had a way to measure TAS instead of CAS, it would be
at almost exactly 2/3 of best glide speed for any reasonable
aircraft. This is only academically interesting, since airspeed
indicators are notoriously inaccurate at the low end of their
range. It's significantly slower, though. If you really want to
know what it is, you can determine it (roughly) by experiment.
You won't get an exact number without shutting down the
engine, but I don't recommend that.

Mike Beede

On Fri, 17 Dec 2004 09:15:40 -0600, Mike Beede wrote:

In article , David CL Francis wrote:

On Tue, 14 Dec 2004 at 06:50:15 in message
, d&tm
wrote:

Wont the best glide speed also keep you in the air the longest? if not what
speed will?

Nope. Minimum sink rate is close to maximum lift AoA.
Strictly, for simple math, it is at max (CL^(3/2))/CD.

If you had a way to measure TAS instead of CAS, it would be
at almost exactly 2/3 of best glide speed for any reasonable
aircraft. This is only academically interesting, since airspeed
indicators are notoriously inaccurate at the low end of their
range. It's significantly slower, though. If you really want to
know what it is, you can determine it (roughly) by experiment.
You won't get an exact number without shutting down the
engine, but I don't recommend that.

Mike Beede

Actually, its much closer to 3/4 Vbg (not 2/3) 76% to be more precise.
This is also very close to stall AOA in most light GA aircraft, so you will
amoost certainly have the stall warning blaring at you if you try and fly at
Vmin-sink.