---------------------------------------------------------- TeamGrumman-List Digest Archive --- Total Messages Posted Wed 04/29/09: 12 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:54 AM - Re: Percent power. How to calculate? . . . Survey says! (flyv35b) 2. 06:02 AM - Re: Percent power. How to calculate? . . . Survey says! (flyv35b) 3. 06:10 AM - Re: TteamGrumman-List: Percent power. How to calculate? . . . Survey says! (923te) 4. 07:17 AM - Re: Percent power. How to calculate? . . . Survey says! (cloudvalley@comcast.net) 5. 08:40 AM - Re: Percent power. How to calculate? . . . Survey says! (flyv35b) 6. 09:52 AM - Re: Percent power. How to calculate? . . . Survey says! (teamgrumman@aol.com) 7. 09:57 AM - Re: Re: TteamGrumman-List: Percent power. How to calculate? . . . Survey says! (teamgrumman@aol.com) 8. 11:22 AM - Re: Percent power. How to calculate? . . . Survey says! (cloudvalley@comcast.net) 9. 12:04 PM - Re: Percent power. How to calculate? . . . Survey says! (flyv35b) 10. 12:33 PM - why would I ask him? (GOLDPILOT@aol.com) 11. 06:36 PM - Re: why would I ask him? (cloudvalley@comcast.net) 12. 11:10 PM - Re: Percent power. How to calculate? . . . Survey says! (teamgrumman@aol.com) ________________________________ Message 1 _____________________________________ Time: 05:54:33 AM PST US From: "flyv35b" Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! > In hind site, I wish I had installed a manifold pressure gauge. Both the > DER and I believed the POH is what pilots would be using to fly at 75% > power. We had no idea that 75% power meant different things in different > references. We had no idea the FAA approved flight manual for the AG5B > would be a gallon an hour more under the same conditions. When I installed the O-320 engine in my AA-1C I installed a MP gauge because I knew there was no data for this engine combination and knowing MP was almost mandatory to be able to have any reasonable idea of what the power setting was. This has turned out to be a very good way to determine and adjust power setting. I can take the power chart from my Bonanza which shows % power for various RPM and MP settings and temperatures and use it to determine power with the Grumman. It won't be far off. I would also install a MP gauge in a Tiger if I owned one even though the factory has provided info as I believe that MP is important even for a fixed pitch prop installation. For example: what is your power setting in a dive or even a 500 fpm descent at 2700 rpm? If you don't know the MP you have no idea what it is! You might be operating at 15" hg. In your case, Gary, with your engine and prop I would think you would absolutely want a MP gauge. Cliff -- We are a community of 6 million users fighting spam. The Professional version does not have this message ________________________________ Message 2 _____________________________________ Time: 06:02:47 AM PST US From: "flyv35b" Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! > Between Concorde and Auburn at 5500 feet I found 2 C degree air (38.6 F). > Altimeter setting was 30.50 inches. > I went full throttle and got 23.8 inches of manifold pressure. > (Now, as we all should know by now, the inlet on the AG5B eats > about an inch of pressure so I would suspect the actual manifold > pressure should have been 24.5 inches or so.) I don't think you would achieve 24.5" with your plane. Even the very best induction systems loose about 1" MP through the air filter and induction plumbing (at sea level and full throttle). At 5500 ft you would be down to 25" minus the induction system loss of 1" say or maybe 1.5" on the AG-5B. So 23.8" is reasonable (for the AG-5B induction system). A MP gauge will tell you a lot about this as you see what the actual MP is on takeoff when you apply full throttle. You can also take out the air filter and possible see what effect it has. Cliff -- We are a community of 6 million users fighting spam. The Professional version does not have this message ________________________________ Message 3 _____________________________________ Time: 06:10:19 AM PST US From: "923te" <923te@att.net> Subject: TeamGrumman-List: Re: TteamGrumman-List: Percent power. How to calculate? . . . Survey says! You might want to use the more accurate and more current chart and recalculate your numbers. I sent it to you direct 'cause I didn't thiunk it would come thru here. I'll try and attach it now as I see that teh Fig 3-34 did come thru. This is Fig 3-35. Hoe it helps ned ________________________________ Message 4 _____________________________________ Time: 07:17:22 AM PST US From: cloudvalley@comcast.net Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! Hi Cliff, =C2-I thought you didn't worry about manifold pressure; just get to about 2500RPM or so and then pull out the mixture til rough and back in slightly ..smile Brian ----- Original Message ----- From: "flyv35b" Sent: Wednesday, April 29, 2009 6:02:16 AM GMT -08:00 US/Canada Pacific Subject: Re: TeamGrumman-List: Percent power. =C2-How to calculate? . . . =C2-Survey says! > Between Concorde and Auburn at 5500 feet I found 2 C degree air (38.6 F). > Altimeter setting was 30.50 inches. > I went full throttle and got 23.8 inches of manifold pressure. > =C2- =C2- =C2- (Now, as we all should know by now, the inlet on the AG5B eats > =C2- =C2- =C2- about an inch of pressure so I would suspect the act ual manifold > =C2- =C2- =C2- pressure should have been 24.5 inches or so.) I don't think you would achieve 24.5" with your plane. =C2-Even the very best induction systems loose about 1" MP through the air filter and induction plumbing (at sea level and full throttle). =C2-At 5500 ft you would be do wn to 25" minus the induction system loss of 1" say or maybe 1.5" on the AG-5B. So 23.8" is reasonable (for the AG-5B induction system). =C2-A MP gauge w ill tell you a lot about this as you see what the actual MP is on takeoff when you apply full throttle. =C2-You can also take out the air filter and pos sible see what effect it has. Cliff -- We are a community of 6 million users fighting spam. The Professional version does not have this message =========== - =========== MS - =========== e - =C2- =C2- =C2- =C2- =C2--Matt Dralle, List Admin. =========== ________________________________ Message 5 _____________________________________ Time: 08:40:38 AM PST US From: "flyv35b" Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! I don't WORRY about it. But I use it for setting the power level. And yes, I do lean to rough and then back in slightly until it smooths out. RPM will depend on what altitude you are at and how much power you want. Up high I would run pretty much at 2700 rpm. Cliff ----- Original Message ----- From: cloudvalley@comcast.net To: teamgrumman-list@matronics.com Sent: Wednesday, April 29, 2009 7:14 AM Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! Hi Cliff, I thought you didn't worry about manifold pressure; just get to about 2500RPM or so and then pull out the mixture til rough and back in slightly..smile Brian ----- Original Message ----- From: "flyv35b" To: teamgrumman-list@matronics.com Sent: Wednesday, April 29, 2009 6:02:16 AM GMT -08:00 US/Canada Pacific Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! > Between Concorde and Auburn at 5500 feet I found 2 C degree air (38.6 F). > Altimeter setting was 30.50 inches. > I went full throttle and got 23.8 inches of manifold pressure. > (Now, as we all should know by now, the inlet on the AG5B eats > about an inch of pressure so I would suspect the actual manifold > pressure should have been 24.5 inches or so.) I don't think you would achieve 24.5" with your plane. Even the very best induction systems loose about 1" MP through the air filter and induction plumbing (at sea level and full throttle). At 5500 ft you would be down to 25" minus the induction system loss of 1" say or maybe 1.5" on the AG-5B. So 23.8" is reasonable (for the AG-5B induction system). A MP gauge will tell you a lot about this as you see what the actual MP is on takeoff when you apply full throttle. You can also take out the air filter and possible see what effect it has. Cliff -- We are a community of 6 million users fighting spam. The Professional version d - MATRONICS WEB FORUMS -<==== ________________________________ Message 6 _____________________________________ Time: 09:52:46 AM PST US Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! From: teamgrumman@aol.com Hi Cliff, My plane does have manifold pressure. As does the Tiger I flew with the 800. It's just that the Tiger used for the flight tests didn't. We didn't think it was necessary since the plane didn't come with it. We thought the POH was enough. Which it should be. ________________________________ Message 7 _____________________________________ Time: 09:57:44 AM PST US Subject: Re: TeamGrumman-List: Re: TteamGrumman-List: Percent power. How to calculate? . . . Survey says! From: teamgrumman@aol.com I got it Ned, But, it doesn't show fuel burn. The entire bottom half of the chart is missing on your chart. -----Original Message----- From: 923te <923te@att.net> Sent: Wed, 29 Apr 2009 6:09 am Subject: TeamGrumman-List: Re: TteamGrumman-List: Percent power. How to calculate? . . . Survey says! You might want to use the more accurate and more current chart and recalculate your numbers. I sent it to you direct 'cause I didn't thiunk it would come thru here. I'll try and attach it now as I see that teh Fig 3-34 did come thru. This is Fig 3-35. Hoe it helps ned ________________________________ Message 8 _____________________________________ Time: 11:22:11 AM PST US From: cloudvalley@comcast.net Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! Hi again Cliff, I was just kidding, but I do understand, higher RPM up high. Hope to see yo u sometime at lunch over there. Brian ----- Original Message ----- From: "flyv35b" Sent: Wednesday, April 29, 2009 8:40:01 AM GMT -08:00 US/Canada Pacific Subject: Re: TeamGrumman-List: Percent power. =C2-How to calculate? . . . =C2- Survey says! =EF=BB I don't WORRY about it.=C2- But I use it for setting the power level.=C2 - And yes, I do lean to rough and then back in slightly until it smooths out.=C2- RPM will depend on what altitude you are at and how much power y ou want.=C2- Up high I would run pretty much at 2700 rpm. Cliff ----- Original Message ----- From: cloudvalley@comcast.net Sent: Wednesday, April 29, 2009 7:14 AM Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Surve y says! Hi Cliff, =C2-I thought you didn't worry about manifold pressure; just get to about 2500RPM or so and then pull out the mixture til rough and back in slightly ..smile Brian ----- Original Message ----- From: "flyv35b" < flyv35b@minetfiber.com > Sent: Wednesday, April 29, 2009 6:02:16 AM GMT -08:00 US/Canada Pacific Subject: Re: TeamGrumman-List: Percent power. =C2-How to calculate? . . . =C2-Survey says! > Between Concorde and Auburn at 5500 feet I found 2 C degree air (38.6 F). > Altimeter setting was 30.50 inches. > I went full throttle and got 23.8 inches of manifold pressure. > =C2- =C2- =C2- (Now, as we all should know by now, the inlet on the AG5B eats > =C2- =C2- =C2- about an inch of pressure so I would suspect the act ual manifold > =C2- =C2- =C2- pressure should have been 24.5 inches or so.) I don't think you would achieve 24.5" with your plane. =C2-Even the very best induction systems loose about 1" MP through the air filter and induction plumbing (at sea level and full throttle). =C2-At 5500 ft you would be do wn to 25" minus the induction system loss of 1" say or maybe 1.5" on the AG-5B. So 23.8" is reasonable (for the AG-5B induction system). =C2-A MP gauge w ill tell you a lot about this as you see what the actual MP is on takeoff when you apply full throttle. =C2-You can also take out the air filter and pos sible see what effect it has. Cliff -- We are a community of 6 million users fighting spam. The Professional version d =C2- =C2- =C2- =C2- =C2- =C2- =C2- - MATRONICS WEB FORUMS -<===== href="http://www.matronics.com/Navigator?TeamGrumman-List">http://www.mat ronics.com/Navigator?TeamGrumman-List href="http://forums.matronics.com"> http://forums.matronics.com href="http://www.matronics.com/contribution"> =================== == ________________________________ Message 9 _____________________________________ Time: 12:04:56 PM PST US From: "flyv35b" Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! I didn't realize you were using someone else's plane for the certification tests. Cliff ----- Original Message ----- From: Sent: Wednesday, April 29, 2009 9:49 AM Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! > > Hi Cliff, > > My plane does have manifold pressure. As does the Tiger I flew with the > 800. It's just that the Tiger used for the flight tests didn't. We > didn't think it was necessary since the plane didn't come with it. We > thought the POH was enough. Which it should be. > > > -- We are a community of 6 million users fighting spam. The Professional version does not have this message ________________________________ Message 10 ____________________________________ Time: 12:33:21 PM PST US From: GOLDPILOT@aol.com Subject: TeamGrumman-List: why would I ask him? Because he is a very knowledgeable individual **************Access 350+ FREE radio stations anytime from anywhere on the web. Get the Radio Toolbar! (http://toolbar.aol.com/aolradio/download.html?ncid=emlcntusdown00000003) ________________________________ Message 11 ____________________________________ Time: 06:36:09 PM PST US From: cloudvalley@comcast.net Subject: Re: TeamGrumman-List: why would I ask him? Hi, =C2-Fred is a very funny fellow! =C2-Brian Preston ----- Original Message ----- From: GOLDPILOT@aol.com Sent: Wednesday, April 29, 2009 12:31:12 PM GMT -08:00 US/Canada Pacific Subject: TeamGrumman-List: why would I ask him? Because he is a very knowledgeable individual Access 350+ FREE radio stations anytime from anywhere on the web. Get the R =============== == ________________________________ Message 12 ____________________________________ Time: 11:10:40 PM PST US Subject: Re: TeamGrumman-List: Percent power. How to calculate? . . . Survey says! From: teamgrumman@aol.com The first plane to get my cowling, that is, a cowling that had been conformed by the FAA to match the tooling and drawings I submitted (even though my cowling came out of the same tooling) was Greg Ketell's old plane, N1976T, currently owned by Jeff Keesaman from San Diego. I've asked Jeff to post his experiences with the cowling on this forum. Maybe he will someday. ------------------------------------------------------------------------------------- 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.