Pietenpol-List: Mods to Model A engine mount....

matronics · Post by **matronics** » Mon Aug 22, 2005 9:19 pm

Original Posted By:
My fuse is 1" wider than plans and I have a Model A mount that is built to plans....sowhen I bolt on the 3/4" tubing braces, the holes that the ash sits onare spaced 1" too far apart.I considered adding a 1/2" piece of ash to each side of each of the bearers (tomove them toward each other 1/2" each tomake up the 1") but that adds a bit ofa moment arm.....probably not an issue but I would rather keep the engine asclose to the center line of the tubing holes as possible.I can notch the tubing per the attached picture and weld the gap shut. The bendworks out to approximately 3 degrees, which means I'll notch out a .04" gap(not much more than the width of my saw blade) and then weld that back together.(My preference is to do NO cutting and welding......)Since I only need a 3 degree bend over a 19" distance (for a change in the holelocation of 1/2" on each side of the engine mount) I'm considering heating thetubing up and bending it in 1/2". Maybe heating up a 12" length (rather thana short distance) would not compromise the strength of the tubing......wouldthat work?I'm obviously going to run this by my EAA Tech Counselor but these solutions seemmore than adequate....but I sure would like a sanity check from anyone whocares to help me out here.Suggestions? Notch/weld or heat/bend?I welcome all input!Thanks! Jim in Plano________________________________________________________________________________

matronics · Post by **matronics** » Mon Aug 22, 2005 10:20 pm

Original Posted By: Jim Markle
I like the heat and bend option.Greg ----- Original Message -----

matronics · Post by **matronics** » Tue Aug 23, 2005 3:06 am

Original Posted By: Clif Dawson

matronics · Post by **matronics** » Tue Aug 23, 2005 9:24 pm

Original Posted By: "Phillips, Jack"
Thanks Clif!Bending near the bolt bracket sounds like the ticket!Am I sure it's 3=B0?Well, a 1" rise on a triangle with a base (or slope) of 19" works out to about3 degrees.....so...hey wait.....oops....it should have been a 1/2" rise (duh,I suppose there's no reason to make up the ENTIRE 1" difference on one side!!!).....uhhh,a 1/2" rise across 19" is actually 1.51 degrees...so yeah, about 2degrees.....even better!I'm gonna heat and bend......I saw somewhere that you can take a tubing bend out by heating one side of thetubing to make it draw the tubing in a particular direction. I'm gonna try that.I'm feeling a LOT better about this now...thanks again.(I LOVE this process!!!)Jim in Plano.....looking forward to having some pockata-pockata sounds in my drivewayin a few weeks....________________________________________________________________________________Subject: RE: Pietenpol-List: A-65 Oil PressureDate: Wed, 24 Aug 2005 07:17:28 -0400

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