---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Sun 05/29/11: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 09:37:59 PM PST US From: Gary Vogt Subject: TeamGrumman-List: SB-185 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 _____________________________________ Time: 09:49:47 PM PST US From: Gary Vogt Subject: TeamGrumman-List: 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 ; n76lima@mindspring.com Cc: Barry Schulte 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. ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message teamgrumman-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/TeamGrumman-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/teamgrumman-list Browse Digests http://www.matronics.com/digest/teamgrumman-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.