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1. 06:24 PM - Re: Dynon Pitot Tube vs. Gretz mount (Bill Repucci)
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| Subject: | Dynon Pitot Tube vs. Gretz mount |
--> RV9-List message posted by: "Bill Repucci" <bill@repucci.com>
I have now spoken to both Warren Gretz and the good people at Dynon
about the Pitot tube issue. The following is what I have learned.
Yes, the holes are close but you don't "match drill" the pitot tube to
the same hole size as the Gretz mount. You drill and tap four holes for
a #6 machine screw. This should give you enough edge clearance. The
screws should then be secured with loc-tight. (sp?) Apparently the air
load on the pitot tube, even at 200 mph, isn't that significant
according to Dynon.
The other option is to order the unfinished mount from Warren Gretz,
shorten it, and drill the holes as you see fit, then have the mount
chromed.
I'm going to try and drill the holes as Dynon suggests (next weekend)
and will let everyone know how it goes.
Bill
RV-9
SN: 90737
Wings
-----Original Message-----
From: owner-rv9-list-server@matronics.com
[mailto:owner-rv9-list-server@matronics.com] On Behalf Of Bill Repucci
Subject: RV9-List: Dynon Pitot Tube vs. Gretz mount
--> RV9-List message posted by: "Bill Repucci" <bill@repucci.com>
(The following is not intended to point a finger at either Warren Gretz
or the people at Dynon, it is simply a request for information from the
RV builder community.)
Last weekend was spent cutting the left wing skin and fitting the Gretz
pitot tube mast, which is supposed to hold the Dynon pitot tube I bought
for my future EFIS system.
After cutting the wing skin, drilling holes in the ribs for the AOA
line, etc. I test fit the mast and all looked good until I slid the
pitot tube down the mast and found the pre-drilled holes in the mast
that are to hold the pitot tube in place wouldn't leave any room for
proper edge distance .
I'm currently talking to both Dynon and Warren Gretz about a solution.
BTW, both the Gretz mount and the Dynon unit seem to be top quality
items and I do expect there will be an easy resolution. (I smudged the
chrome pitot tube bracket so the flash wouldn't wash it out. The chrome
finish on the mast appears to be top notch.)
You can see a picture of what I'm talking about here:
http://www.repucci.com/bill/images/dynon%20and%20gretz.jpg
If any of you has a factory built pitot tube laying around, could you
measure the shoulder depth and send me a note? The Dynon unit is
supposed to be identical to what Cessna uses.
Thanks for your help.
Bill
SN: 90737
Finishing up the wings and waiting for the next big box.
www.repucci.com/bill/baf.html
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