Igor_U Posted January 14 Report Posted January 14 2 hours ago, Echo said: So an unmodded C with a powerflow exhaust at 24 squared and 5500’ is doing 150knots? It's actually about 161 KT true speed (assuming 0deg C) as 150 is indicated speed. I wonder what's the fuel flow but regardless of that, it's very fast. 1 Quote
Hank Posted January 14 Report Posted January 14 @Alan Fox, I just flew my 1970 C today, 4+ hours into the wind at 6500 msl. This is what I had: 22"/2400, leaned 50° ROP 42°F OAT 30.47" barometer 6500 msl Full tanks (52 gal), me and an overnight bag Empty weight = 1606; useful load =969 lb. Call takeoff weight under 2200 lb. These were the results: 150-152 mph indicated or ~170 mph true Groundspeed = 126 knots into the wind I'll know total fuel burn later, no self serve in this here part of Tejas, gotta let the FBO do it. Once upon a time, call it 7-8 years ago, I took off one beautiful fall morning in Sweet Home and climbed to 1500 msl, around 1200 agl. WOT/2700, Full Rich, she hit 165 mph indicated. But in a 500 fpm descent, indicated airspeed has always been right on 165 mph; higher descent rate gives higher indicated speed. With a fresh allover wax, it may hit 170 mph at 500 fpm; super dirty, it won't go above 160 mph. 1 Quote
Echo Posted January 14 Report Posted January 14 1 hour ago, Igor_U said: It's actually about 161 KT true speed (assuming 0deg C) as 150 is indicated speed. I wonder what's the fuel flow but regardless of that, it's very fast. Seems legit. 1 Quote
bonal Posted January 15 Report Posted January 15 Some years ago we did a three heading gps and produced a 149knot tas that was at 8k with two on board. My recent 24 24 was solo so I can believe the 154k it produced fuel was also just under 50% overall fairly light load. At 5500 ft my 24 inch mp was with wide open throttle and full rich on a very cool morning but as I mentioned in my previous post the air was pretty bumpy. I’ve seen the pictures Alan posted and don’t doubt the speed he recorded I just wonder how 160 knots is possible in an unmodified C I don’t see how a power flow exhaust would make any difference 24/24 should be the same regardless of the pipe. Perhaps knowing what prop is on that C might explain the performance. speaking as a proud C owner I’m more than willing to accept his claim. Go Mooney. 1 Quote
Echo Posted January 15 Report Posted January 15 Almost 175mph indicated. What was fuel flow? I have NEVER in over 25 years of Mooney ownership seen that indicated on ASI in level flight. Over 800 hours. I guess my planes are out of rig… Quote
MikeOH Posted January 15 Report Posted January 15 18 minutes ago, Echo said: Almost 175mph indicated. What was fuel flow? I have NEVER in over 25 years of Mooney ownership seen that indicated on ASI in level flight. Over 800 hours. I guess my planes are out of rig… Yeah, mine, too! I had to check the date of the original post; thought it might have been April 1 1 Quote
Igor_U Posted January 15 Report Posted January 15 All this talk about speed makes me want to wash and polish my plane.... 2 Quote
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