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Some performance numbers now that I have Wheelpants, Gearleg

 
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Ray.R.Doerr(at)sprint.com
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PostPosted: Mon Jun 25, 2007 6:58 am    Post subject: Some performance numbers now that I have Wheelpants, Gearleg Reply with quote
Now that I have wheel pants, gear legs and intersect fairings on it was time to go out and do some speed runs. I have been feeling the "need for speed" now for almost one year, ever since I started flying my RV-10 (N519RV). Anyway I finally finished the fairing and went out to record some data.

I had the autopilot fly with using 90 degree ground tracks.

Legend
------

TRK - GPS Ground Track
IAS - Indicated Air Speed
TAS - True Air Speed from Dynon EFIS
GS - GPS Ground Speed
OAT - Outside Air Temperature from Dynon EFIS
MAP - Manifold Pressure
RPM - Engine RPM
FF - Fuel Flow from Dynon EMS ( Calibration is bang on)
ALT - Indicated Altitude
DA - Density Altitude from Dynon EFIS
Test run using wide open throttle at 8500 indicated using 2450 RPM and 50 degrees RICH of peak. Flying weight was approx 2480.

TRK IAS TAS GS OAT MAP RPM FF ALT DA
-----------------------------------------------------
0 139 164 164 59 21.8 2450 14.6 8500 10560
90 138 162 175 59 21.8 2450 14.6 8500 10560
180 139 164 172 60 21.8 2450 14.6 8500 10600
270 139 164 162 60 21.8 2450 14.5 8500 10600
----
168.25 for TAS using 4 way GPS Average

Test run using wide open throttle at 8500 indicated using 2450 RPM and 50 degrees LEAN of peak. Flying weight was approx 2450.

TRK IAS TAS GS OAT MAP RPM FF ALT DA
-----------------------------------------------------
0 132 155 157 60 21.8 2450 11.2 8500 10580
90 130 155 165 59 21.8 2450 11.2 8500 10580
180 132 155 162 59 21.8 2450 10.9 8500 10560
270 133 156 155 59 21.8 2450 11.1 8500 10530
----
159.75 for TAS using 4 way GPS Average

Test run using wide open throttle at 11500 indicated using 2300 RPM and 50 degrees LEAN of peak. Flying weight was approx 2420.

TRK IAS TAS GS OAT MAP RPM FF ALT DA
-----------------------------------------------------
0 120 147 145 49 19.5 2300 9.2 11500 13600
90 120 147 161 49 19.5 2300 9.1 11500 13600
180 121 150 162 49 19.5 2300 9.1 11500 13600
270 120 147 143 49 19.5 2300 9.2 11500 13600
----
152.75 for TAS using 4 way GPS Average

Test run using wide open throttle at 11500 indicated using 2450 RPM and 50 degrees LEAN of peak. Flying weight was approx 2390.

TRK IAS TAS GS OAT MAP RPM FF ALT DA
-----------------------------------------------------
0 120 147 144 48 19.2 2450 9.8 11500 13500
90 121 149 161 48 19.3 2450 9.7 11500 13500
180 122 150 160 48 19.4 2450 9.9 11500 13500
270 125 153 147 48 19.4 2450 9.9 11500 13500
----
153.00 for TAS using 4 way GPS Average
From this you can see my TAS from my Dynon is reading about 4 - 6 knots low. This could be in part due to static port type and placement (I used stock placement and Cleveland Ports) or could be OAT probe placement (mine is on after tailcone rib under Emp fairing. I am considering installing another OAT off of my EMS half way out on the wing and then compare the two. The one in the tail cone is connected to the Dynon EDC off the EFIS.
Also you can see that at 11,500 indicated (DA 13500) there is not much speed gain from 2300 RPM LOP to 2450 RPM LOP and the engine runs real nice at 2300 RPM.
I figure I'm going to fly this plane a lot at around 9 Gals per hour at 7500 - 9500 and flight plane for 150 - 155 Knots.

Thank You
Ray Doerr
N519RV 40250 (Hobbs 262)

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jjessen



Joined: 22 Apr 2006
Posts: 285
Location: OR
PostPosted: Mon Jun 25, 2007 7:20 am    Post subject: Some performance numbers now that I have Wheelpants, Gearleg Reply with quote
Nice job! It looks like your best is 19.1 miles per gallon (statute).
That's terrific! Thank you for the great note.

John Jessen
40328 and drooling all over my keyboard.

do not archive

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