In article ,
Eric Greenwell wrote:
Andreas Maurer wrote:
On 12 Mar 2004 12:05:42 -0800, (Mark James Boyd)
wrote:



Where's the stall warning horn? I'm still utterly baffled why there
isn't a stall warning device on each wingtip? Is this really that
much extra drag? Is it more drag than that caused by having
to make a wing design that buffets before a full stall?


There are gliders that are equipped with stall audio warnings. Most of
these stall warnings have been switched off permanently because they
were yelling all the time while thermalling.

THe difficulty is getting a true stall warning, rather than an airpeed
alert (even if it is adjusted to G loading). Other difficulties with the
type Andreas mentions is it doesn't know when the spoilers are out, the
flap position, or the bugs on the leading edge.

Well, on Cezznas and others, it's just a dorky cheap little tab
which is at the right angle to flip up and close
a circuit when the AOA is pretty close to stall. The Beech
Duchess has 2, one for not so much flaps (on one wing),
one for lotsa flaps (on the other wing).

I guess I'm not even that surprised they aren't on nost
sailplanes, I'm interested to know of the folks who've built
their own, have you guys thought of trying it? Man
I'd love to know what them wingtips are doing...
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Mark Boyd
Avenal, California, USA