teamgrumman(at)yahoo.com
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 Posted: Sun Mar 31, 2013 11:18 am Post subject: AA1B Jaguar cowling mockup |
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The really interesting thing about the Cheetah engine mount is that it is VERY difficult to put shims between the engine and the shock mount. The shape of the shocks and the way they sit throws off the alignment A LOT if a shim is added. Adding shims makes installing the bolts impossible.
I initially tried installing the mockup engine with one shim on each. I couldn't get the bolts in. After messing with it for an hour or more, I gave up for the day.
The next day, I removed all of the shims and started over. When I installed the Jag cowling with no shims, I was surprised how close the cowling fit with the stock Cheetah mount and no shims. Pic 3018s
I took another pic before I added the shim. If you look closely, you can see the engine is just slightly up and to the right. That's how a stock, unadjusted, Cheetah cowling would fit. Pic 3019s
Instead of removing the upper right bolt to install a shim, I cut a slot in a thin shim, loosened the bolt, and installed the shim. With the thin shim in the upper right, the engine is exactly centered on the cowling.
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Bob, if you and Dave are installing the cowling, I'd recommend starting with the engine roughly .3 to .6 degrees down; measured on the left side or right side, I don't know. It seems like the angle is not symmetric side-to-side. Start with one shim in each location. Adjust it from there.
Note: On the cowling I'm currently installing, it looks like the left side of the spinner bulkhead is about .050 to .060 inches closer to the cowling than the right side. I plan to block sand that side until it's the same as the right.
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