Originally Posted by Dennis Harm
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.