The stall 'horn' in the Katana DA20-C1 is nothing more
than a hole in the leading edge that at the right angle
'whistles'. Quite effective I might add too! Ready
to get the drill out for your leading edges;')


Or use the string AOA idea. I'd like to see this work.
I'm
not so keen on having something else the pilot has
to
LOOK at (vs. hearing). But who knows, and it's a fun
experiment...
--

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Mark Boyd
Avenal, California, USA