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  #31  
Old 09-22-2021, 01:24 PM
MK77 MK77 is offline
 
Join Date: Apr 2013
Location: Evanston, IL
Posts: 138
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I've got a Catto 3-blade FP on my -7 and my numbers aren't that much different from what you're seeing. At altitude I routinely cruise at 2650 and see 168 KTAS or so, with a lot more throttle to give. For a short test, I ran it full throttle at 8000 ft DA and it will do 183 KTAS but at 2800 rpm (obviously above engine redline, prop redline is 3100 rpm). Static is around 2300 RPM.

Point is that of course an well designed fixed pitch will go as fast as a CS, just at a different RPM depending on the pitch. For my typical mission the Catto is a great prop with nice balance of take-off, climb and cruise performance ...but I am one of those currently picking up soda cans on the side of the road to put towards an eventual CS upgrade
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RV-7 Tip-up - Flying!
XP Superior IO-360 w/cold air sump, Catto 3 blade prop
Garmin G3X
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  #32  
Old 09-22-2021, 01:35 PM
EricTheRV8er's Avatar
EricTheRV8er EricTheRV8er is offline
 
Join Date: Sep 2021
Location: Smithfield North Carolina
Posts: 31
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Quote:
Originally Posted by MK77 View Post
my numbers aren't that much different from what you're seeing. At altitude I routinely cruise at 2650 and see 168 KTAS or so, with a lot more throttle to give.
That's 10kts faster than what I am seeing out of our -8 running 2700rpm.
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  #33  
Old 09-22-2021, 02:10 PM
gasman gasman is offline
 
Join Date: Mar 2007
Location: Sonoma County
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Quote:
Originally Posted by EricTheRV8er View Post
That's 10kts faster than what I am seeing out of our -8 running 2700rpm.
Make him an offer on his Catto 3-blade FP prop.......
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  #34  
Old 09-23-2021, 07:22 PM
Tom @ N269CP Tom @ N269CP is offline
 
Join Date: Oct 2017
Location: Green Cove Springs, FL
Posts: 129
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Ditto on going with a c/s prop.
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Tom

==================================
RV-8 N269CP
O-360-A1A w/Hartzell CS prop on 100LL
Slick-IC+PMag ignitions
Steam gauges
EI UBG-16, FP-5, & MUX-8A datalogger
Garmin Aera 660
TruTrak ADI Pilot II (GPS coupled)
Garmin GDL39 3D ADSB-In
uAvionix Tailbeacon ADSB-Out
Infinity grip w/Matronics trim speed control
Reiff preheater system
TCW oil cooler air damper w/servo drive
AntiSplat oil mist separator
Mountain High O2D1 O2 system

Location: Durango, CO (KDRO)
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