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  #1  
Old 04-01-2018, 06:37 PM
Dennis Harm Dennis Harm is offline
 
Join Date: Feb 2015
Location: Cadott wisconsin
Posts: 18
Default Pitot mount location

Building a 14A and am wondering where to mount the pitot tube . I have the gretz mount and donít want it to interfere with the tie down ring and rope, thanks Dennis
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  #2  
Old 04-01-2018, 08:23 PM
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czechsix czechsix is offline
 
Join Date: Mar 2006
Location: Spring Hill, KS
Posts: 293
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Quote:
Originally Posted by Dennis Harm View Post
Building a 14A and am wondering where to mount the pitot tube . I have the gretz mount and donít want it to interfere with the tie down ring and rope, thanks Dennis
I mounted mine just aft of the spar and adjacent to the next rib inboard from the tie-down location for the express reason of avoiding interference with the tiedown ropes. If you're using your own tiedown stakes you can usually locate them to avoid having the rope interfere with the pitot, but most ramps have tiedowns that are spaced to accommodate much larger aircraft, and the tiedown ropes tend to end up going way outboard from the ring on an RV.

The downside of locating the pitot inboard of the ring is that the aileron pushrod is just above the mount, so you have to use right angle fittings to attach to the pitot & AOA lines where they come up through the mount into the wing. Did that on my -8A and doing the same on my -14, but it might be a better option to move the pitot several bays outboard from the tiedown...far enough to avoid interference with the ropes, but not too close to the wingtip since accuracy is affected especially at high AOA near the tip.

Also if I had to do it over I'd consider mounting the pitot on the right wing if you're planning to put the magnetometer in the left wing location per the plans. That gets all the magnetically 'noisy' stuff (pitot heat, aileron trim, and aileron servo) in the right wing and should leave the left wing a much 'quieter' environment for the magetometer.
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Spring Hill, KS
RV-8A N2D #80583 - built/flew/sold
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  #3  
Old 04-02-2018, 04:44 AM
mturnerb mturnerb is online now
 
Join Date: Apr 2015
Location: Ponte Vedra, FL
Posts: 522
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I mounted mine one bay outboard of the access panel closest to the tie-down. (next to rib just outboard of the access panel). This allowed me to use the rib to help anchor/support the pitot mount, run the pitot/AOA tubes and wiring into the bay for access, use the access plate to mount the pitot heat controller, etc.

It's outboard of the tiedown, but according to my advisor (Vic Syracuse) this shouldn't be a problem most of the time.

This blog post and next couple after show my mounting: https://turnerb14a.blogspot.com/2018...th-update.html
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  #4  
Old 04-02-2018, 07:02 AM
KeithB KeithB is offline
 
Join Date: Mar 2014
Location: Granbury, TX
Posts: 140
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I also went 1 bay outboard of the access panel on the lt wing. Itís a little tricky getting it in and out, but you donít do that frequently. I like czechsixís suggestion of moving it to the right wing - this would have eliminated issues I had with pitot heat interfering with the magnetometer, and the wiring changes would have been minor.
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RV-14A Builder - kit #136
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  #5  
Old 04-02-2018, 12:20 PM
TimO TimO is offline
 
Join Date: Feb 2005
Location: Wisconsin
Posts: 358
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Definitely outboard, outboard of the bell crank stuff too. If you get it outboard of all of that aileron pushrod and bell crank linkage it'll be easy to install. I think on mine it's maybe 1 bay inboard from the wingtip. That way I could easily reach it with the wingtip off, and it's clear of everything. Once it's mounted you'll probably never touch it again anyway, and the airflow is nice and clean out there.
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Tim Olson - CFI
RV-10 N104CD - Flying 2/2006 - 1300+ hours http://www.MyRV10.com
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