----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
Scott Morgan asked: > Then upon calculations this works out to > about 4.45 gal. fuel burn on the stop watch and a > little over 5 on the tach time. Is this what others > are burning? My instructor and another IA say this is > not enough fuel burn. They feel that it should be > around 6.5 to 7 gal/hr. Scott, I'd think that John Cooper (Skyport) is right about that being a climb prop on a C-90. A 7148 is a climb prop on a C-85 after all. Consider this: In cruise at 2400 rpm, my C-85 with a climb prop would burn 5.4 gph. In bopping around doing takeoffs and landings, stalls, turns, etc. - the kind of stuff you do on a biennial - I'd get 4- 4.5 gph. Your tach versus clock numbers show significant below-reference-rpm time during the flight. Based on my C-85 experience, I find it hard to believe that a C-90 could burn 6.5 to 7 gph in a bopping around biennial. The numbers they cite are what I'd expect in a C-152 with a 115 hp engine. I wouldn't worry about it. Just check your climb rate and cruise speed to see that they are about what you had before all this. Ed Burkhead http://edburkhead.com/ ed -at- edburkheadQQQ.com (change -at- and remove the QQQ) I know you believe you understand what you think I said, but I am not sure if you realize that what you heard is not what I meant. (Jim, AKA Midnight Plowboy) -----Original Message----- From: Scott Morgan [mailto:[EMAIL PROTECTED] Sent: Monday, March 21, 2005 6:52 AM To: [email protected] Subject: [COUPERS-TECH] proper fuel burn ----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- Coupers, my A2-A has a freshly overhauled C90. I have 32 hours on it at this time. I used it this weekend for my bi-annual and ended up flying for about 2.45 hours, according to my stop watch and 2.1 hours on the tach. I refueled and put in 11.4 gal. in the wing tanks and none in the nose tank. I never add to the nose tank. Then upon calculations this works out to about 4.45 gal. fuel burn on the stop watch and a little over 5 on the tach time. Is this what others are burning? My instructor and another IA say this is not enough fuel burn. They feel that it should be around 6.5 to 7 gal/hr. On takeoff I get only 2300 RPM but in level flight it runs about 2400 to 2450. Anyone have any comments or suggestions? Thanks Scott PS. My prop is a freshly reconditioned iB90-CM7150 __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ======================================================================== ====== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/ ========================================================================== ==== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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