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Unread 09-15-2007, 11:35 AM
James39R James39R is offline
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Join Date: Sep 2007
Posts: 3
Default Bragging Rights?

I currently have the powerflow exhaust installed in my sport with 150 HP engine. I have had the installation done about two months ago and here's a summary of my performance figures; I have had my plane for over 10 years,and I have progressively "cleaned up the airframe." I also have the demer wingtips installed. The first flight with 40 gal. gas and just me on board, I saw initial ROC of 850 fpm to 3,000 ft. The take off roll was aproximately 10 seconds and Fuel flow was 16 GPH on take off...RPM static 2420 and 2600 at VY. A quick speed run at maximum RPM 2720 at 3,000 indiated average. 119.5 knots....at 2600 RPM 114 knots, at 2500 RPM 107 knots, and at 2420 103 knots. The over all speed increase with a power flow is aproxmately 5 knots.. . I am very satisfied with the power flow system, it allows me to have excelent rate climb even on hot 90 degree days I can count on at least 650 rate of climb!!

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Unread 09-17-2007, 10:23 AM
dtilman dtilman is offline
Join Date: Aug 2007
Location: Daytona Beach, FL
Posts: 72
Default Sport Performance


Thank you for your feedback. You mentioned some rate of climb numbers. what you have seen with your stock exhaust during similar conditions?
Darren Tilman
General Manager
Power Flow Systems, Inc.
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Unread 09-17-2007, 11:25 AM
James39R James39R is offline
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Join Date: Sep 2007
Posts: 3
Default Bragging rights...

My perfomance figures on the previous post were achieved on a 85F day with a DSA @ 2500. My rate of climb before the powerflow exh would be @600 fpm IAS of 100mph...at 2500rpm.. . The powerflow has increased my ROC @ 250fpm. Now I routinely cruise at 4.5 to 6.5 and can lean the engine much more efficiently with ff @ 9gph 2550rpm TAS 110kts ..
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Unread 09-18-2007, 12:19 PM
BobLewis BobLewis is offline
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Join Date: Sep 2007
Posts: 3
Default performance

James, fly that thing higher!!! ha ha. I too see 850 FPM consistently up to DA of 4K. I can say my average speed increase (indicated) is 10 MPH. My static leaned will now reach 2400 RPM vs. 2250 prior. Also at the lower altitudes I see 135 mph indicated-solo or a small passenger with 60 gals of fuel. I never saw these speed straight and level on other flights. I'm pleased too !!
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Unread 09-30-2007, 10:51 AM
James39R James39R is offline
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Join Date: Sep 2007
Posts: 3
Default Recent Higher Altitude Testflight

With the density altitude at 2600 ft. and 40 gal. and just me (175 lbs) ALT setting of 30.03 I preform a speed run at 6,500 the OAT was 76 degrees. I was still able to redline through 2710 for an average speed run at 120 knots. At 2600 RPM, my average was 115.5 kts at 10 gph. This works out at 75% power. I was suprised at the higher speed cruise at 75% power. Most of my flights are 120 nm or less, and here in the midwest I rarely fly above 5.5. I will plan on a test flight at 9000 to check for fuel flow at 75% power. AT these speeds (for a 74) aerobatic sport I get a lot of questions from ATC and recently, I was asked to slow down from over taking the C-172 landing at the same airport as me.....3 times!!!..My gound speed was 135 knots at 250 fpm. descent rate.....I really tried to slow down.

Last edited by James39R; 09-30-2007 at 10:59 AM.
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