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-   -   How well does an RV-9 climb? (https://vansairforce.net/community/showthread.php?t=146784)

N941WR 02-17-2017 09:42 PM

How well does an RV-9 climb?
 
Pretty darn good!

After finishing work today, I had some flight testing to do, which required a climb from 1040' AGL to 12,500' AGL. Every 1,000' feet I leveled off to let the plane accelerate, throttled back, powered back up to full power, and then resumed the climb.

I just checked the data and it took 13:08 from brake release to level out at 12,500. My average climb rate was 871.3 FPM and my average speed was 122.4 knots. That's pretty impressive and makes me want to try a Vy climb from sea level to 12.5.

I was still putting out 18.7" MAP at that altitude. (The pressure altitude was 14,930.)

BTW, my plane as a stock ECI O-360 and a FP Catto two bladed cruise prop.

Mark C. 02-17-2017 10:07 PM

Bill, what was your TAS, level flight at 12,500? Mark C.

N941WR 02-17-2017 10:19 PM

Mark, I'm not really sure since I didn't do a speed run. Almost as soon as I hit 12.5, I throttled back and started down hill. (I was testing the EIC at different power settings, not the airplane.)

The data shows 162 knots but I wasn't leaning for best power. The SkyView was showing 58% power and 9.6 GPH.

N941WR 02-17-2017 10:24 PM

Mark, my WOT and leaned for best power (75%?) at 8,000' DA is 174 knots.

grubbat 02-18-2017 06:30 AM

Sounds fun
 
Time to climb to 12,000? Guess this needs to researched. ��
I could do it from say 900msl to 12,500. Best climb rate in the -9 would be around 105 TAS so no flaps.

N941WR 02-18-2017 07:21 AM

Craig, when you get out of Phase 1 we can meet at Brunswick and do it out of there.

Maybe Mark and Bruce will join us.

I wonder how we would stack up against a Rocket, if we continued to 17 5? Will our wing make up for the lack of power as the air density drops off?

Mark C. 02-18-2017 05:16 PM

Bill and Craig, on Friday I had a passenger both of us about 175lbs full fuel tanks. Power climb to 8,500 leveled off the best reading was showing 186mph off the Skyview slight leaning. Your 174 knots is 200.24mph. I have an IO360 with a Catto cruise tri-prop. I don't remember seeing 74% power. Mark C.

grubbat 02-18-2017 06:02 PM

Close
 
Mark, your numbers are close to mine. Bill's piece is quite a bit faster than mine.

tsneidin 02-19-2017 05:48 PM

My time to 12k results
 
I have a RV-9 with and IO-360 and 3 blade Catto. From take off elevation of 900 to 12,000 took 10:22, average VS 1083.

Level at 12k leaned for best power was 173kts at 8.6gph, MAP 19.2, 63% Pwr, DA 13360.

N941WR 02-19-2017 06:47 PM

Quote:

Originally Posted by tsneidin (Post 1151470)
I have a RV-9 with and IO-360 and 3 blade Catto. From take off elevation of 900 to 12,000 took 10:22, average VS 1083.

Level at 12k leaned for best power was 173kts at 8.6gph, MAP 19.2, 63% Pwr, DA 13360.

Todd, that sounds about right for a 360 powered -9. I really wonder what it would do if Craig cut a prop specifically for a time-to-climb run.


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