Xref: utzoo sci.electronics:4468 rec.models.rc:1128
Path: utzoo!attcan!uunet!seismo!sundc!pitstop!sun!decwrl!labrea!rutgers!tut.cis.ohio-state.edu!unmvax!ncar!noao!asuvax!nud!sunburn!dover!waters
From: waters@dover.uucp (Mike Waters)
Newsgroups: sci.electronics,rec.models.rc
Subject: Re: Airspeed sensing
Keywords: airspeed, R/C models
Message-ID: <592@dover.uucp>
Date: 10 Dec 88 06:24:27 GMT
References: <848@earvax.UUCP> <2810@kitty.UUCP> <3508@tekig4.TEK.COM>
Reply-To: waters@dover.UUCP (Mike Waters)
Distribution: na
Organization: Motorola CAD Mesa, AZ {dover}
Lines: 29

For the sake of (more) argument, the speed which intersts you (me?)
the most is surely the stall speed. Especially during landing.

How about two small flaps on the top/bottom of a wing which are
held in place by the normal airflow, but deflect in the turbulance
present in a stall. THere are several similar systems in use in
full size aircraft I believe, but haven't located details.

Another possibility is the integrated pressure sensors using IC
technology to sense the difference between top pressure and
bottom pressure might work. 

Why differential? So it wont sound when the plane is sitting on the ground!

As for a stall signal, a loud audio tone (sonalert ?) would do nicely
for landings.

Another possibility is to put a low power AM transmitter on board, 1 
transistor operating in the AM broadcast band. THe FM band is close
enough to R/C freqs. to be a little chancy. A fancier system would be
one of the cheaper wireless mic.s sold as toys, some of them are in
the AM broadcast band.

Any other ideas?
-- 
Mike Waters    (for your EDIFication)   *
Motorola CAD Group                      *    Witty remark goes *HERE*
Mesa, AZ   ...!sun!sunburn!dover!waters *
          OR   moto@cad.Berkley.EDU     *