Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25627
Location: Livermore CA USA
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 Posted: Fri Aug 20, 2010 8:51 pm Post subject: Performance Numbers - IO-390/Hartzell/RV-8 |
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Dear Listers,
So I could smell the disbelief in the air regarding my performance claims, so tonight after work I went up and did some testing. All tests were at the same altitude with the autopilot on, going the same direction (mostly South) with a Westerly wind over about the same 25 mile area.
One interesting thing that I noticed tonight that I hadn't in the past was what a dramatic effect exacting leaning could have on the speed for a given power/prop setting. A small adjustment in the mixture could increase or decrease the speed sometimes as much as 5 MPH.
Below is a table of the numbers I saw tonight. I've include the spreadsheet as well as photos of each setting from the EFIS PDF/Engine data.
All numbers on the EFISs are in MPH. The GPS GS is in the upper left corner of the PFD. The TAS is on the bottom right side of the PFD display. Indicated is on the left side in the middle of the PFD. Temp is in the upper left corner of the Eng display. MAP, RPM, and Flow are also on the Eng display shown as gauges with text.
An interesting thing I noticed that at 27.x MAP, adjusting the RPM between 2000 and 2690 had a 9.8 to 17.0 impact of fuel flow (7.2 GPH) and a 22MPH impact on speed. That's about a $32/hr difference.
Let the discussion begin... 
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
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Matt Dralle
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