Is there a drag rake guru out there?

Have you seen:
http://www.glidingmagazine.com/Featu...cle.asp?id=199

Bob

"Bob Salvo" wrote in message
...
An analog meter does a nice job of smoothing the information in mild
turbulence. Additional smoothing may be needed with a digital system. If
a
pitot that is used to sample the airspeed at the other port of the
pressure
gauge has the same hose size and length as the hose coming from the rake,
the pressure gauge output should be smoother. You might consider using a
Kiel tube for the pitot and mounting it on you drag probe. I hope to hear
more about your tests.

Bob

"nimbusgb" wrote in message
ups.com...
I have a differential pressure gauge built around a Honeywell DUXL01D.
Measuring 0 - 1" H20 which is the same range that I've seen used on the
old 80's repogle systems and in Dick Johnsons tests.

At the moment, during testing I'll be using an analog meter, my
amplifier outputs a signal between .6 and 4 volts. Ultimately it'll go
into an A/D converter on a digital system I have.

Ian

Yup, been doing a LOT of reading lately!

Ian

Pretty much.

2 * 10 pitots each over a 33mm span with a 'missing' tube a the
midpoint. Gives the rake a 75mm span. The plenum chambers are seperate
on each side of the wing and averaged by a tube running down the rear
edge of the chamber.

Ian

Do you intend to use it to find the optimum flap position?

Bob

"nimbusgb" wrote in message
oups.com...
Pretty much.

2 * 10 pitots each over a 33mm span with a 'missing' tube a the
midpoint. Gives the rake a 75mm span. The plenum chambers are seperate
on each side of the wing and averaged by a tube running down the rear
edge of the chamber.

Ian

Yes, thats the general idea.

Ian