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  #1  
Old 11-05-2009, 08:52 PM
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petehowell petehowell is offline
 
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Location: MN
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Default 3rd Year Performance #'s

I just signed off the 3rd annual condition inspection on the -9A, and I thought I would re-run some cruise performance #'s to see if she has lost anything. Plus, a meeting was cancelled, and the weather was perfect!

I preflighted, took off, ran on up to 8500ft, and set up for cruise. I locked on the Trutrak and took some 4 way data on the cardinal headings.

22.2" MP, 2270 RPM, LOP 6.0-6.1 GPH, carb heat about 1/4 on.

Here is the data:



NTPS spreadsheet shows 151.6 KTAS with a small std dev. I was happy to find this is just a touch better than my Phase 1 test data. Over 28 smpg at 170+ mph, I guess I'll have to keep her......

Here is the APRS track, the big squares are the test runs:

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Amateur Plane - RV-9A N789PH - 2050+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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  #2  
Old 11-06-2009, 09:37 AM
Randy Randy is offline
 
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Location: Sedona Arizona
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Default

Pete,

Good looking data report, but I would like to know what engine and prop you are using too.

Thanks,

Randy C
RV7A
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  #3  
Old 11-06-2009, 10:14 AM
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petehowell petehowell is offline
 
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Default Hardware

ECI O-320 160HP, Carb, Hartzell, Dual EI

Homebuilt plenum - but I don't think this adds anything
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Pete

Amateur Plane - RV-9A N789PH - 2050+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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  #4  
Old 11-06-2009, 11:08 AM
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KevinL KevinL is offline
 
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Default

Where did you get the spreadsheet?
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  #5  
Old 11-07-2009, 09:59 PM
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petehowell petehowell is offline
 
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Default Spreadsheets

Here you go:

http://www.ntps.edu/images/stories/d...ts/gps-pec.XLS
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Pete

Amateur Plane - RV-9A N789PH - 2050+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN

Last edited by petehowell : 01-08-2012 at 10:01 PM. Reason: updated link
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  #6  
Old 11-07-2009, 10:35 PM
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LifeofReiley LifeofReiley is offline
 
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Location: Round Rock, TX
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Default Pete...

You are like... way COOL!!! I love your test data, Thanks!
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  #7  
Old 11-08-2009, 01:48 PM
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Location: Bennington, Vermont USA
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Default Inspired

Suitably inspired I ran some tests today and input the data into the NTPS spreadsheet.

TAS as indicated by my temperature and pressure corrected Dynon D100 is consistently reading 5 or 6 kts higher than that calculated from the GPS496 ground speeds.

Anyone know what this means? It implies that the pressure difference between the pitot and static ports is higher than it should be. It's unlikely that the pitot is high so could the static read low if it has a leak?

Jim Sharkey
RV6 - Phase 1

PS - std dev was more like 1 kt instead of the 0.1 kt shown above. Guess I need to fly more accurately

Last edited by jsharkey : 11-08-2009 at 01:50 PM.
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  #8  
Old 11-09-2009, 10:00 PM
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aarvig aarvig is offline
 
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Location: KANE, Hugo, Minnesota
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Default Sweet!

Those are really good looking numbers. The absolute perfect blend of economy and speed! For those of you who have never ridden in Pete's plane it is without a doubt the smoothest running RV I have ever been in. Probably one of the reasons it is so fast and efficient!
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  #9  
Old 11-26-2010, 03:58 PM
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petehowell petehowell is offline
 
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Location: MN
Posts: 2,194
Default Year 4 Data -- just out of annual....

Looks pretty much the same after 750 hours. Can't complain.... Otto the pilot was flying, and the numbers were pretty steady. Cold -8C , but nice and smooth up at 8000. I think the temps gave me a knot or so....

22.2" MP, 2270 RPM, LOP 6.0-6.1 GPH, carb heat about 1/4 on.



Here was the track today:
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Pete

Amateur Plane - RV-9A N789PH - 2050+ Hrs
Amateur Radio - KD0CVN
Doggies Delivered - 25+
St. Paul, MN
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  #10  
Old 11-26-2010, 06:34 PM
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Default

Good stuff Pete. Yours has always been at least 7-8kts faster than mine. Although mine has never seen temps anywhere near that cold. But my Otto has buttons to push (gotta be careful which one you push), and a pulse. Thanks for sharing.
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