Today's Message Index:
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1. 09:37 PM - SB-185 (Gary Vogt)
2. 09:49 PM - Re: Jaguar Cowling installation questions Part 3 - engine thrust angle (Gary Vogt)
Message 1
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Does anyone have a .pdf of
American General Aircraft Corporation Service Bulletin No. SB-185-A, Revision A,
dated January 10, 2005
What a pain in the ass. I can't find it on the internet and apparently, it's no
longer in my computer either.
Message 2
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| Subject: | Re: Jaguar Cowling installation questions Part 3 - engine |
thrust angle
Boris,
The scribe marks on the cowling are really close to the final alignment.
If I were to give you my old cowling and you installed it, I'm sure your engine
would need further aligning.
That said, I think there is enough variation in the engine mounts and Lord
mounts to just use them as a starting point. I have a new cowling coming for my
plane. I plan on doing an initial fit with a trim to the scribe marks plus
about .060 to .080 inches. That will allow me to clamp the cowling completely
in place with the front of the cowling against, or nearly so, the aft spinner
bulkhead. Then, I will add or subtract engine mount shims until I get it where
I want it. Once the cowling and engine are in agreement, I will trim off the
final amount and put in screw holes.
Bob Steward seems to think the engine should be high. That is, above the
cowling. His reasoning is the mounts will sag. I don't agree. Based on
testing with a cowling that gave just 1/4 inch between the alternator and the
cowling, I can tell you the engine comes up A LOT during flight. With the
engine slightly nose down, you can lift the engine at the spinner/prop and raise
it easily 1/8 inch. Drag wise, keep the spinner below or at the cowling during
flight.
I wouldn't over work the engine trust angle a lot. I've installed my cowling on
at least a dozen planes and, with the exception of the plane I used for the
initial fabrication, they all needed some adjusting to make fit. Some more than
others.
Gary
________________________________
From: b v <bvnj@yahoo.com>
<dave@hondahaven.com>; n76lima@mindspring.com
Cc: Barry Schulte <flyadive@gmail.com>
Sent: Sun, May 29, 2011 7:28:00 PM
Subject: Jaguar Cowling installation questions Part 3 - engine thrust angle
Guys,
Please take a look. I wonder if you could please help me regarding the spacers
on engine mounts.
I just bought a set of new Lord engine mounts. The old bottom ones were leaking
and the spinner was sagging about 1/2 inch against the nose bowl rim. Now I have
placed 1 spacer on each(as it was before) and torqued it per manual, 40 lb-feet.
Before fitting the new cowl I tried the old one to check and found that engine
is now hanging a little high against the nose bowl and a little to the right.
Please take a look at the attached pictures.
My question is - should I try to add spacers to align the spinner to the old
cowl before I fit the new cowl, and if you think I should, then why? In other
words, why aligning to the old cowl would give me a better thrust angle then
relying on the angle provided by the engine mount together with the set of new
properly torqued Lord mounts?
Maybe I should try to measure the thrust angle?
Gary, I think you had a method of measuring up/down thrust angle. Could you
please remind me how you did it and what is the angle to aim for?
I guess the left/right angle could be checked by measuring the distance from
propeller tips to wings when prop is positioned horizontally. I guess one should
try to make sure they are equal. Or not?
Thank you,
-Boris
P.S. By the way, you have to remove the nose strut boot before fitting the new
cowl. You all probably know it, but if you don't want to cut it off, you have to
remove the nose strut. I think the installation instructions don't mention this.
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