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----- Original Message ----- From: "Ernest Christley" <echristley@nc.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, August 22, 2007 8:44 AM
Subject: [FlyRotary] Re: Tap 'em holes was [FlyRotary] Throttle Body Nut Ideas
Ed Anderson wrote:
Scott, I think the best answer is to simply tap those bolt holes for the thread size of your bolts. This does a number of things.
1. There is nothing to fall off inside the plenum, no nuts, no bolts or no nut plates
2. Its a few fractions of an ounce lighter
3. You never have to worry about getting onto the back side of the plate (looks like you intend to weld it to the plenum tube.
4. Two of your nuts are pretty close to the wall of your plenum if that bright circle is indeed where it will be placed - can't tell for sure but could be interference with the wall of plenum.
5. You never have to worry about it again.
Ed
I've been told by a machinist that tapped holes in aluminum are weak. Any truth to that?
Well, yes, seeing as how aluminum is weaker that steel, I think that statement makes sense. If it were a thin piece of aluminum I might be concerned, but it looks at least 3/8" perhaps 1/2" thick. Tapped holes to hold on a light throttle body with those size bolts will have no problem what soever.
Ed
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