---------------------------------------------------------- RV9-List Digest Archive --- Total Messages Posted Sun 10/10/04: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:24 PM - Re: Dynon Pitot Tube vs. Gretz mount (Bill Repucci) ________________________________ Message 1 _____________________________________ Time: 06:24:56 PM PST US From: "Bill Repucci" Subject: RE: RV9-List: Dynon Pitot Tube vs. Gretz mount --> RV9-List message posted by: "Bill Repucci" 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" (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 == direct advertising on the Matronics Forums. == == ==