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  #11  
Old 11-01-2018, 11:42 AM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
Join Date: Apr 2011
Location: Cincinnati, OH
Posts: 1,814
Default data point

5.7 gph, 153 kt TAS, ~20 in HG, 11.5K ft, 2250 rpm

riding the wind

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Steve Melton
Cincinnati, OH
RV-9A, Tip-up, Superior O-320, roller lifters, 160HP, WW 200RV, dual impulse slick mags, oil pressure = 65 psi, EGT = 1300F, flight hours = 700+ for all

Simplicity is the art in design.

see Amanda Melton for www.rvplasticparts.com

Last edited by Steve Melton : 11-01-2018 at 11:45 AM.
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  #12  
Old 11-01-2018, 11:51 AM
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db1yg db1yg is offline
 
Join Date: Mar 2006
Posts: 615
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I ran several different generations of Catto 3 blade props on my IO360 equipped 9a for many years. Also spent a lot of time testing prototype units for Craig. All testing was at 8k density or higher and the 9 wing really liked slightly higher when testing for TAS performance. To set max power I would go to altitude wot, level, let things stabilize, and then set egt on my #4 (first to peak) at around 100 rop and again let things stabilize. The next step was to move the red knob VERY slowly richer until the rpm peaked. I did this several times to insure it was repeatable and took the egt at peak rpm as my set point for best power. Mine usually peaked the rpm at around 120-130 degrees rich of peak. This way when testing for TAS I could simply go to the same density altitude and set 120-130 rich of peak egt and know I was pretty close to peak power.

BTW, with a fp prop this HAS to be done in smooth air--the least amount of turbulence really makes this task difficult if not impossible.

Hope this helps.

You are gonna love that RV9/180/Catto combo--smooth, efficient, fast, and low maintenance.

Cheers,

db
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RV9a/ECiIO360/James Cowl/WW RV200 Prop
Flying since 3/06 and still smiling!!!
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  #13  
Old 11-01-2018, 12:15 PM
Flying Canuck Flying Canuck is offline
 
Join Date: Jan 2015
Location: Red Deer, Alberta, Canada
Posts: 193
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These speeds look really good compared to what I'm getting right now. I don't have pants or leg fairings yet and I'm running a lot slower.

Recent flight #1:
  • 7400' DA
  • 64% Power
  • Peak EGT (best economy)
  • 7.0 gph
  • 122 KTS TAS

Recent flight #2:
  • 9100' DA
  • 66% Power
  • ~140 ROP (A little too rich)
  • 9.3 gph
  • 133 KTS TAS

I really hope I can get at least 20 KTS more in these conditions once I put my pants and fairings on. I think that may be a pipe dream. In any case, don't want to hijack this thread - I'll start my own sometime.
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Claude Pitre
RV-9A #91081, C-GCPT
Dynon SkyView HDX, IO-320 and WW 200RV C/S. Flying as of August 6, 2018
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  #14  
Old 11-01-2018, 02:12 PM
Raymo's Avatar
Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 1,807
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Quote:
Originally Posted by Flying Canuck View Post
I really hope I can get at least 20 KTS more in these conditions once I put my pants and fairings on. I think that may be a pipe dream. In any case, don't want to hijack this thread - I'll start my own sometime.
That's about what I picked up so it's not a pipe dream. You'll also run quite a bit cooler CHTs, thanks to faster speeds.

To keep with the thread topic. I generally run my -7A

8500-11500
160 KTAS
8-8.2 GPH
LOP

Maybe I should try burning a little more gas to go faster.
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Ray
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, 1 PMag, Vetterman Trombone Exh, SkyTech starter, PlanePower Alt
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines
NSDQ

"The object of the game, gentlemen, is not to cheat death: the object is not to let him play."
Patrick Poteen, Sgt. U.S. Army
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  #15  
Old 11-02-2018, 02:02 PM
db1yg's Avatar
db1yg db1yg is offline
 
Join Date: Mar 2006
Posts: 615
Default Don't Be Disappointed

Claude don't think something is wrong if you don't see that 18-20 knot increase. Raymo appears to be running a fp 3 blade Catto--per your signature you are running a 200RV CS prop. When Raymo installed his fairings and got them lined up he benefitted by removing drag from the airframe and the plane flew faster. Since the airframe had less drag he also reduced the load on the engine prop combo and the rpm went up--therefore producing more hp and again flying faster. With a constant speed prop you would get the first benefit (lower airframe drag) from your fairings but you can already produce max available hp via use of the blue knob therefore you may not see as dramatic an increase as a fp RV.

BTW, back when I built my 9a (2003-2006) I had a fp 3 blade Catto and saw 16-17 knots increase with the install of the fairings. If memory serves my rpm at wot also went up well over 100 rpms.

Hope this helps.

Cheers,

db
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RV9a/ECiIO360/James Cowl/WW RV200 Prop
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