---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Thu 10/06/11: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:35 AM - Short-stack Powerflow exhaust - aerodynamic cover for it? (Pete Kuhns) 2. 10:47 AM - Re: Short-stack Powerflow exhaust - aerodynamic cover for it? (Gary Vogt) ________________________________ Message 1 _____________________________________ Time: 07:35:17 AM PST US Subject: TeamGrumman-List: Short-stack Powerflow exhaust - aerodynamic cover for it? From: Pete Kuhns Hi Gary: My plane has the short stack Powerflow exhaust. I think it's kinda draggy up there and was wondering if you ever made some covering for it that reduced it's airflow 'signature' (parasitic drag). The oil vent tube also is kinda draggy down there. Just wondering where you found speed improvements on the Cheetah by reducing parasitic drag. Thank you! -- Pete Kuhns N27161, '79 Cheetah GEZ, Shelbyville, IN ________________________________ Message 2 _____________________________________ Time: 10:47:33 AM PST US From: Gary Vogt Subject: Re: TeamGrumman-List: Short-stack Powerflow exhaust - aerodynamic cover for it? Hi Pete,-=0A=0AI've made-3 different fairings-that fit behind the sho rt stack. -The short one worked the best. -Plus, it fits up snug behind the pipe so it closes the hole created when you cut out the exit ramp. - I can have Dave make you one for $100 with shipping. -You'll need to do s ome trial and error on the mounting to get the least drag. -=0A=0AMy 77 C heetah would true out at about 140 knots. -That's running over redline. -McCauley prop. -Stock exhaust. -It was light too. -One radio. -O ne GPS. -No VOR. -But, even with ported and polished cylinders and the HC mod, a loaded Tiger would out climb it. -=0A=0ALots of drag. -I buri ed the comm antennas, got rid of the VOR antennas and steps. -=0A=0AI res tored a 77 Cheetah a few years back. -He did everything to that plane. -With a New LyCon engine and Sensenich prop, he could true at 142 knots a t 2800 RPM with the steps and VOR antennas.=0A=0AGary=0A=0A=0A_____________ ___________________=0AFrom: Pete Kuhns =0ATo: teamgrumman -list@matronics.com=0ASent: Thursday, October 6, 2011 7:32 AM=0ASubject: Te amGrumman-List: Short-stack Powerflow exhaust - aerodynamic cover for it? =0A=0A=0AHi Gary: My plane has the short stack Powerflow exhaust. I think i t's kinda draggy up there and was wondering if you ever made some covering for it that reduced it's airflow 'signature' (parasitic drag). The oil vent tube also is kinda draggy down there. =0A=0AJust wondering where you found speed improvements on the Cheetah by reducing parasitic drag. Thank you! =0A=0A=0A-- Pete Kuhns=0AN27161, '79 Cheetah=0AGEZ, Shelbyville, IN=0A=0A ====================== ------------------------------------------------------------------------------------- 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.