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04-21-2012, 10:53 PM
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Join Date: Mar 2012
Location: Wichita Falls, TX
Posts: 315
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2 Blade vs 3 Blade
What are the pros/cons? Or is there a place to read about the pros/cons?
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04-21-2012, 10:56 PM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,642
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3 blade can be smoother - 2 blade is faster.
__________________
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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04-21-2012, 11:24 PM
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Join Date: Aug 2008
Location: Lawton, OK
Posts: 265
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Pros and cons
Three blade requires a longer slot in the lower cowl if used in an "A".
Bill
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04-22-2012, 04:13 AM
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Join Date: Nov 2008
Location: McMinnville, Oregon: HOME of the SPRUCE GOOSE
Posts: 540
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2 blade. VS 3 blade
Here is what I have heard so far.
2 blade is the most efficient w/ highest cruise
3 blade provides greater low end thrust although the penalty is more drag which will sacrifice your cruise speed slightly.
__________________
Tailwinds...
Simplicity is the ultimate sophistication.
Leonardo Da Vinci
Working on a RV-4
Citabria 7GCBC
Cessna 180
RV7 I0-360 C/S, Slider, AP, Glass, etc. sold.
RV6 O-320 F/P, Slider, AP, Steam, etc., sold
Citabria 7KCAB rental
Piper Cherokee, sold
Sparrowhawk, sold
Proud -VAF- Supporter - Exempt, Dues Paid Anyway.
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04-22-2012, 07:02 AM
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Join Date: Oct 2011
Location: Port St Lucie, FL
Posts: 261
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Hammerheads are better with a 3 blade.
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Damon Wack
RV-7 in progress
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04-22-2012, 03:51 PM
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Join Date: Dec 2009
Location: Bismarck, ND
Posts: 212
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3 blade looks cooler.
more ground clearance.
3200 rpm limit.
top speed to date 187kt, down low and cold temps.
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Larry Buller
RV7A slow build, Tip up, IO360 200hp, Catto 3 blade, Dynon Skyview, arinc 429, ems, SV transponder, Garmin GNS430w, Aera 560, Dynon D6.
FLYING!
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04-22-2012, 04:10 PM
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Join Date: May 2005
Location: Brisbane Australia
Posts: 568
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One thing to note is that you need to pull the power back to 2100 rpm in rain.
getting the bottom cowl on/off is a pain.
I do find that my Catto 3 blade is smooth to fly behind.
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Jamie lee
Brisbane, Australia
RV7A - Now Flying.
0-360,carb,catto 3 blade.
VH-XJL
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04-22-2012, 04:12 PM
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Join Date: Oct 2008
Location: Utah
Posts: 8,145
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3 cons
one more blade to wash  |
04-22-2012, 04:19 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by DAGO
3 blades kill more bugs (cleaner windscreen) and have greater sex appeal.  |
That about covers it.
Three bladed props tend to have smaller diameters, so if you are operating off dirt strips a lot, this might be the best option for you.
The thought that a two bladed prop is faster than a three bladed prop came from the certified world. Now that builder’s like Craig Catto can customize a prop to YOUR engine and airframe, he can make a two, three or four bladed prop with identical performance.
I don’t know where the RPM restriction in rain came from as that had nothing to do with the number of blades but everything to do with the leading edge erosion. Catto can make a two bladed prop with nickel leading edges so you don’t have to throttle back in the rain.
PS. Try using the search tool, this topic comes up almost as often as the tip-up vs. slider question / NW vs. TW / Carb vs. FI / Blue is faster than Red / Etc.
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Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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