---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Sun 01/10/10: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:15 PM - Cowling Update (teamgrumman@aol.com) ________________________________ Message 1 _____________________________________ Time: 12:15:49 PM PST US Subject: TeamGrumman-List: Cowling Update From: teamgrumman@aol.com I began the installation of the second cowling yesterday. This is going on Martin's plane. It's in for an annual and cowling. Martin put a depo sit down about a year ago. The initial fitting of the cowling is already done. I have a spare fusela ge that I use for fitting. Today, I'm going to be sanding and detailing the surface. I've already noticed that the distance used in the joggle at the forward end (where the upper cowling attaches) is about .030 to lo w. The tooling will get some fine tuning. I'm taking a lot of pictures. "Is the cost worth it?" Martin asked. Depends. >From a maintenance stand point, yes. It's a LOT easier to R&R the new cow ling than the old one. >From a checking the oil point of view, no. Five cam-locks and a screw nee d to be removed vs opening a door. >From a speed point of view, likely. Jeff is showing a consistent 5 to 6 knots improvement at the same power settings. >From a CHT point of view, probably. Jeff is showing a much improved temp distribution and 15 degrees lower temps. >From a fuel efficiency point of view, possibly. I've flown my plane next to four different Tigers at the same speed and 2700 rpm. At the same spe ed and roughly the same rpm (they flew 2700 rpm, mine varied), my fuel bur n was anywhere between .5 gph and 3 gph less than the other plane. Is tha t all the cowling? or something else? My plane doesn't have any junk han ging off it like most planes. So, it's possible that the other planes are just draggy anyway. ----- I flew alongside a very clean 75 Traveler. This Traveler would true at about 135 knots under most conditions. At 132 knots true, my fuel flo w was about 2 gph less. My fuel burn was 7.5 gph. Plus, it's not just the cowling but all new baffles and baffle seals. ------------------------------------------------------------------------------------- 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.