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 Posted: Tue Aug 08, 2006 8:18 am Post subject: Europa-List Digest: 22 Msgs - 08/07/06 |
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In a message dated 8/8/2006 12:00:09 A.M. Pacific Standard Time,0 europa-list(at)matronics.com writes:
Time:0 05:28:17 AM PST US
From: "nigel charles"0 <nwcmc(at)tiscali.co.uk>
Subject: RE: Stalls and0 spins
--> Europa-List message posted by: "nigel charles"0 <nwcmc(at)tiscali.co.uk>
It is important to realise with all stall0 warning systems whether they
are giving you warnings above a nominated0 speed or whether they are
giving you a warning that you are approaching a0 critical AOA.
For example 5kts warning above a critical AOA is better0 than 15kts
warning above a speed which is the wings level one 'g' stall0 speed. If
you bank 45deg in level flight the stall speed increases by about0 40 per
cent so if your wings level stall speed was 40kts at 45deg bank0 it
becomes about 56kts. Thus in this case a speed warning of 15kts0 before
the stall becomes no warning at all whereas a conventional stall0 warner
or AOA system will still provide the 5kt warning
Nigel0 Charles
[/quote]
Nigel,
Excellent comments, This is exactly why I produce an AOA0 system, an AOA is correct under ALL conditions, it will warn you of the AOA, in0 our instrument an audio announcement will advise when about 5% under the minimum0 approach speed. Stall warning devices are like closing the door after0the0 cows are out. To late with to little. An AOA will give proper0 warning when a trend is apparent, warning 5 or so below the min approach speed,0 then the stall warning 5 above the stall. In the US the stall0 warning certification has one stipulation ~~ be at least 5 Kts above0 stall. I've flown some aircraft where the stall warning is coming on at 200 above the stall, the owners totally ignore it, then get into another aircraft0 and wham~~ enough said.
Elbie
EM Aviation
www.riteangle.com
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