3rd Year Performance #'s

petehowell · #1 11-05-2009, 08:52 PM

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:

Randy · #2 11-06-2009, 09:37 AM

Pete,

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

Thanks,

Randy C
RV7A

petehowell · #3 11-06-2009, 10:14 AM

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

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

KevinL · #4 11-06-2009, 11:08 AM

Where did you get the spreadsheet?

petehowell · #5 11-07-2009, 09:59 PM

Here you go:

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

LifeofReiley · #6 11-07-2009, 10:35 PM

You are like... way COOL!!!

I love your test data, Thanks!

jsharkey · #7 11-08-2009, 01:48 PM

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

aarvig · #8 11-09-2009, 10:00 PM

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!

petehowell · #9 11-26-2010, 03:58 PM

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:

scard · #10 11-26-2010, 06:34 PM

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.