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Apr 30, 2007, 04:21 AM
aerobuddy
Discussion

EagleTree Systems Pitot Tube ?


Hello,

Has anyone used pitot tube available with Eagle tree system http://www.eagletreesystems.com/Plane/plane.html ?

Is it good for medium sized models, like one with wing span 1.44m (<5ft)?
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Apr 30, 2007, 06:16 AM
Lift is cheap - Drag sucks
Tom Harper's Avatar
Works great for me. I use 6" brass tube through the leading edge of the wing and a static reference flush with the fuselage. I've use it on two models about the same size as you mention.

Tom
Apr 30, 2007, 07:18 AM
aerobuddy
Mr. Harper
Can u please share a picture of the assembly ?
Apr 30, 2007, 07:54 AM
Old fart. VAAATSP
d_wheel's Avatar
Quote:
Originally Posted by ashvani
Hello,

Has anyone used pitot tube available with Eagle tree system http://www.eagletreesystems.com/Plane/plane.html ?

Is it good for medium sized models, like one with wing span 1.44m (<5ft)?

I first tested mine on an EasyStar . Used a 3" piece of plastic tubing for the pitot and left the static vent open inside the feselage. Worked great.

Later;

D.W.
Apr 30, 2007, 11:33 AM
Lift is cheap - Drag sucks
Tom Harper's Avatar
Ashvani,

Not much to see, but here it is.
Apr 30, 2007, 01:17 PM
aerobuddy
thanks!
Apr 30, 2007, 01:20 PM
Registered User
This tip will cost $10. :-) But it is *really* easy to ding up your pitot tube when handling your wing. Even if you know it's there and are careful ... speaking from experience here. :-)

We use carbon fiber tubes because it's so easy to bend your metal tubes ... even when you are trying to be careful.
Apr 30, 2007, 01:23 PM
aerobuddy
are they (carbon fiber ones) available for purchase .. ??
Apr 30, 2007, 01:54 PM
Lift is cheap - Drag sucks
Tom Harper's Avatar
Olson is right! I've ripped the thing off twice in five flights.
Apr 30, 2007, 02:14 PM
aerobuddy
then i better use carbon fiber one.. thanks for the advice in time.. . i was just going to place the order for the EagleTree one.

Where can I get the carbon fiber one ??
Apr 30, 2007, 02:21 PM
Registered User
I see lots of carbon fiber tubes in my local hobby shop ...
Apr 30, 2007, 11:25 PM
aerobuddy
Quote:
Originally Posted by clolson
I see lots of carbon fiber tubes in my local hobby shop ...
but then don't u need to calibrate it ??
May 01, 2007, 08:59 AM
Registered User
I don't have a lot of experience with pitot tubes. I've been told that in full scale airframes there is somewhat of an art involved with selecting the optimal location for the pitot tube. In our uav airframe, we extended the tube about 6" forward of the leading edge of the wing and far enough out that it wouldn't be affected by the prop wash. The resulting numbers from our sensor (Xbow MNAV) seemed very plausible. A coworker with much more UAV experience than I have indicated that the length of the pitot tube does not have an affect on the sensed pressure. I'm sure you would want to validate your own results in your own application.
May 03, 2007, 11:17 PM
Registered User
with the Xbow, you really don't have an option with the static pressure, since there isn't a connetor for the on the sensor. I just realized that the cooling scoop I put in the window may not be that great of an idea.


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