teamgrumman(at)YAHOO.COM
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 Posted: Sat Oct 30, 2010 10:40 am Post subject: Engine trust angle |
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I got a Tiger in the other day and it's spinner was not centered on the cowling/nosebowl. The engine was installed by Bill Scott.
The shims/spacers used were:
Upper Left: 0
Upper Right: 2
Lower Left: 0
Lower Right: 0
The alignment showed I needed at least one added to the lower right. Not the easiest one to change, mind you. I removed the cowling, got a cherry-picker (no, not a Mexican), and lifted the engine enough to get a shim in. We'll see when the cowling goes back on.
That got me to thinking. Just how do you 'set' the engine "Thrust Angle?"
One of the Grumman guys, a well known racer, told me he sets his engine to a "ZERO" thrust angle. Now, I know that's total bullshit because there is a thrust angle built into the engine mount, so I asked, "Just how do you set the engine at a zero thrust angle?" His replay was, "just like the factory sets it." So, just how does the factory set the thrust angle . . . after the engine mount is built?
Many of you may remember me asking about the shims on your engines and the distance to the back of the spinner. I didn't get a lot of replies, I mean, who wants to go out and look at their engine mounts and measure the distance to the prop, right? Still, each one of the Jaguar cowlings has required a different set of spacers/shims on the engine mounts to get the engine to line up with the cowling.
Who says the cowling is right???? That's the BIG question. The plane from which I made the tooling, that's who. During the modeling of the basic cowling form, I used an O360 block with a crank and one shim at each engine mount. I knew I needed at least one shim on the bottom mounts, so, hey, why not one on each?
When I installed that cowling on my plane, I needed two on the upper left and upper right. One on each bottom.
The spare airplane used 2 thick plus one thin spacer on the right and two thick on the left.
So, which one is right????????
How is the thrust angle set after the engine mount and engine are installed on the plane?????
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