---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Thu 03/03/16: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 10:34 AM - Re: Cylinder Baffles (Gary L Vogt) 2. 08:47 PM - Re: Cylinder Baffles (Discover) 3. 08:58 PM - Re: Cylinder Baffles (Discover) ________________________________ Message 1 _____________________________________ Time: 10:34:14 AM PST US Subject: Re: TeamGrumman-List: Cylinder Baffles From: Gary L Vogt First of all, Hi. How are you and Gina doing? Well, I hope. 1. The drawings you provided have nothing to do with our engines. 2. There is no flat surface on top to make curved to do what the drawing shows. 3. You can do all you want with the bottom of the baffles. Its your time and your money. You wont see a significant change. 4. Do you have cooling problems? What you want is pressure drop across the cylinders. That creates the flow of air. The baffles for the Jaguar cowling are the result of a lot of trial and error on stock baffles. Id love to hear about your results of modifying the baffles. Gary > On Feb 29, 2016, at 9:05 PM, Discover <923te@att.net> wrote: > > > The baffles you developed and got approved are very well done. I think they are resposible for a lot of the cooling improvement my Tiger has. I've been doing some reading lately and found a couple interesting studies that make me want to try a change to the baffles under the cylinder heads where the air exits. I'd like to try extending the curved down portion of the baffle by an inch or two. See Picture Below. > I was interested in Your opinion. > > Two of the articles I was reading are: > http://www.dtic.mil/dtic/tr/fulltext/u2/a800800.pdf > http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19930081408.pdf > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=453324#453324 > > > > > Attachments: > > http://forums.matronics.com//files/image_861.jpeg > > > > > > > ________________________________ Message 2 _____________________________________ Time: 08:47:57 PM PST US Subject: TeamGrumman-List: Re: Cylinder Baffles From: "Discover" <923te@att.net> The articles are in depth studies of cylinders from the radial engine of 1930's vintage. They are very much like ours as you can see from the photos within the articles. The conclusions are quite interesting and address my interest where it says: CONCLUSIONS 1. A 20-percent increase in cooling was obtained by the use of a properly designed baffle exit. This gain corresponds to that which can be obtained when the standard baffle with a 65-percent increase in pressure drop across the baffle is used. 2. The baffle-exit radius and width and exit-duct length were found to be the most critical parts of the baffle. This along with the other articles findings seem to be telling me there may even be more significant improvement possible than we have gotten with the new baffles. The baffles that came with my Jaguar cowl are a vast improvement over the factory baffles even when the factory baffles are brand new. I have recommended them to several people. It is only my experimenter /racing demands that is at work here coupled with my engineering mind that is asking along the lines of a quote I first learned of from Gary's AUCountry website, that cause me to continue to pursue and ask the question... "Never leave well enough alone." Ramond Loewy The air exiting the cylinders and heads must make a 90 degree turn and that is cause for a big loss of energy. This concept was recently pointed out to me in a discussion of the Tiger air box compared to the AG5B airbox. Turns out that there are several 90 degree turns with air in our Tigers... Best, Ned Read this topic online here: http://forums.matronics.com/viewtopic.php?p=453404#453404 ________________________________ Message 3 _____________________________________ Time: 08:58:19 PM PST US Subject: TeamGrumman-List: Re: Cylinder Baffles From: "Discover" <923te@att.net> If you think that adding diffusers to the air exits on the bottom of the heads and cylinders is just too far out there then try looking at it after seeing the extreme this guy went to improve cooling drag... Read this topic online here: http://forums.matronics.com/viewtopic.php?p=453405#453405 Attachments: http://forums.matronics.com//files/image_116.jpeg ------------------------------------------------------------------------------------- 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.