| Subject: | RE: Europa-List: Pneumatic Installation |
|---|---|
| From: | Karl Heindl <kheindl@msn.com> |
| Date: | Sun, 27 Jul 2008 15:16:24 |
I can honestly say that I have never missed not having an AOA. It might be useful in a high performance aircraft with tricky flight characteristics or a jetfighter with HUD. In the Europa it is a gimmick. When I am close to t he ground I don't want to be distracted by checking a bunch of instruments. I go much by the control feel and the sound of the airplane. The Europa au dible stall warner works very nicely=2C and gives a little beep before touc hdown. In a turn the wings have different angles of attack=2C so how is an AOA ind icator going to help you=2C when the probe happens to be on the low wing ? In my glider wings I have installed a stall warner in each wing=2C with dif ferent piezo sounders. When soaring=2C it is quite common to do tight turns at low speeds. Just my opinion. Karl <html><div></div>> Date: Sun=2C 27 Jul 2008 21:03:40 +1200> From: ke ithhickling@clear.net.nz> Subject: Re: Europa-List: Pneumatic Installation> Hickling <keithhickling@clear.net.nz>> > "Now=2C to refine the question fro m a flight safety point of view: Is it safer > to rely on this AoA indicati on and alarm or avoid being on the edge of the > envelope by a good margin in the first place? "> > Jos=2C> As Ron pointed out=2C the AOA is the only thing that will tell you how far you > are from the edge of the envelope. U nder normal weight=2C density altitude=2C no > bank=2C 1g=2C you have a goo d idea of this from airspeed=2C but as Ron pointed out > with high weight =2C low density altitude=2C high bank angle and maybe leveling > out from a steep descent (so high g)=2C the critical angle of attack (ie > incipient stall) will be reached at a very much higher airspeed. AOA allows > you to track how close you are to the stall under all these conditions=2C so > tha t you can maintain a good margin of safety. A stall warner only tells you > when you get too close to the stall. And in theory at least AOA can provid e > other information about airspeed for best L/D ratio (best glide angle) under > these varying conditions as well.> > Keith Hickling=2C> New Zealand -======================== =========> > > |
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