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1. 09:52 PM - Performance Numbers - IO-390/Hartzell/RV-8 (Matt Dralle)
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| Subject: | Performance Numbers - IO-390/Hartzell/RV-8 |
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.
Emacs!
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
Status: Enjoying The Fruits of 2500 Hours of Labor!
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