Discover
Joined: 26 Feb 2007
Posts: 429
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 Posted: Sun Oct 31, 2010 4:38 pm Post subject: Engine "THRUST" angle |
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Gary said:
Not sure how Ned's cowling got so much down angle. Unless the plane I used as a mock up was wrong.
Since I didn't have Ned's plane to do the initial fitting (he wanted it done in a week),
Ned answers:
If the plane you use for mock ups has the engine aligned with the planes original factory cowl then that plane should have it's engine in proper alignment.
I would have liked to have the plane ready 4 1/2 weeks later in time to participate in this years SARL racing which started April 17.
My plane came to your shop March 12 with the spinner down and to the right in reference to the original factory cowl. It left your shop six plus weeks later with your cowl temporarily aligned with the spinner that was in the same misaligned down to right position.
I say temporarily because when the screws are loosened on the side of my jag cowl there is a lot of play so that one must continually hold the cowl in alignment with the spinner as the screws are tightened. The loose screw holes have the result of having no way to know where "center" is and requires the factory cowl to be reinstalled to check for proper engine alignment.
Gary said:
Ned had stated to me that his plane wanted to go to the (right? or was it left?) when he got it. He said it didn't fly straight at any rate. My plane has no trim tabs and flies straight with the same cowling. To me, that is interesting! Does the prop have that much of an effect? Could it be the 3-blade prop?
Questions for Ned
(1) What were the shims count in your final set-up? I forget.
(2) What are they after the alignment?
(3) How did you align your engine? Really. Did you get another cowling and install it then align the engine to that?
(4) If not, What was your procedure?
Ned answer:
My plane pulled to the right with neutral trim tabs but flew straight with trim tabs adjusted counter.
Now with the engine aligned to the original factory cowl it flies straight with neutral trim tabs
Yes I removed the Jag cowl and some baffles and reinstalled the factory cowl and aligned the spinner to the nose bowl by simply tightening the upper left mount to the proper torque. I found that bolt had no threads showing thru the nut and realized this occurred when the local A&P installed the short stack power flow
I can't make out how many shims for sure are in there but I think only one per. It's just as it came from the factory
Your Fellow Grumman Enthusiast
Just a bit less enthused
Ned
[quote][b]
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