to put it another way the aircraft stalls at same AoA at MTOW and at empty
weight. The stall AOA is independent of weight. The stall airspeed will be
different ...
So you set the AOA indicator - and "forget" the airspeed
Am I understanding this right?
Will
Wings closed - fuselage next
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Colin John
Howard Richardson
Subject: Europa-List: Angle of Attack
<cjh.richardson@virgin.net>
Hi Fergus, and others.
A wing will stall at the same angle of attack (AoA) at any weight, provided
the wing configuration (i.e. flap setting etc) is the same.
This is why an AoA gauge is so useful for carrier-borne aircraft who
probably have an approach speed nearer the stall than other aircraft. In the
F4 Phantom we used to approach at approx. 1.18 times the stall speed ( as
opposed to 1.3 Vs) and we used the AoA to give the correct margin above the
stall.
If you use the same AoA on the approach, you will have a higher approach
speed at a higher weight and vice versa. You therefore do not have to
calculate your weight to give a correct speed, you fly the correct AoA on
the approach,as stipulated in the Flight Manual.
This will give you a higher approach speed at heavy weights and a slower
speed at lighter weights.
regards to all
John Richardson
Tri-gear G-BXGG (not built by me), 912S.
|