Am Montag, 12. Oktober 1998 09:00:00 UTC+2 schrieb Paolo Cavosi:
Hi,
I own an szd-55-1 with stall warning device. I thought the instrument was
installed because of the Jar 22 (or 23) certification, but probably i am
wrong.

Anyway there is a dynamic air pressure hole just under the nose and the
instrument measure the air pressure activating a buzzer as soon as the angle
of attack approaches the stall angle. Therefore it works independently from
the air speed and the stall indication is correct also in case of turns.

As far as i know all SZD-55 are equipped with this instrument.

ciao
paolo cavosi "1P".


NAMacLean ha scritto nel messaggio
.. .

In article , (Jeffry
Stetson) writes:

I've never once have seen or heard of one
for gliders. The latest issue of SOARING claims that stall/spin is the
#1
cause of soaring deaths. It seems much of this could be stopped with a
simple instrument ...

I've recently taken delivery of a new SZD-55-1. For the factory test flight
in
Poland before shipping it was fitted with a stall warning instrument, which
was
then removed before export to the United States. It works off a small hole
just
under the nose so it is air pressure activated but I don't know whether it
just
measures airspeed (in which case it won't know whether stall speed is at 1G
or
higher as in a turn) or somehow senses angle of attack. I believe that for
flying in Poland the stall warning device is mandatory for this glider, but
I
have never heard of it being used in any other country.

Could SZD Sailplanes (Mike Salcito?) or anybody reading this is Poland tell
us
any more about this instrument?

Neil MacLean
SZD-55-1 "64R"

I own a SZD 55, too - and one with stall warning (mandatory in Germany, too). However, mine works with airspeed only. It can be adjusted to be activated at a desired airspeed, but is nor AOA. In the factory manual there are two versions of the stall warning described, both are corellating to airspeed.

Paolo, can you tell us more about your stall warning?

That'd be great!

Regards,

Michail