It is important to realise with all stall warning systems whether they
are giving you warnings above a nominated speed or whether they are
giving you a warning that you are approaching a critical AOA.
For example 5kts warning above a critical AOA is better than 15kts
warning above a speed which is the wings level one 'g' stall speed. If
you bank 45deg in level flight the stall speed increases by about 40 per
cent so if your wings level stall speed was 40kts at 45deg bank it
becomes about 56kts. Thus in this case a speed warning of 15kts before
the stall becomes no warning at all whereas a conventional stall warner
or AOA system will still provide the 5kt warning
Nigel Charles
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