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  #1  
Old 09-10-2018, 12:21 AM
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charosenz charosenz is offline
 
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Default 2 blade vs 3 blade. Ever tried both?

I know the general concept (all things equal) is that a 2 blade is generally considered "faster" and a 3 blade a better climb performance prop.

I would appreciate hearing from guys who have actual experience trying both a 2 blade prop and a 3 blade prop on the same plane and how they compared.

Thanks.

Charlie.
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  #2  
Old 09-10-2018, 06:12 AM
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N941WR N941WR is online now
 
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Quote:
Originally Posted by charosenz View Post
I know the general concept (all things equal) is that a 2 blade is generally considered "faster" and a 3 blade a better climb performance prop.

....
Thanks.

Charlie.
It depends.

If you are talking about one size fits all store bought props, you are correct.

If you are talking about custom cut props like a Cato, they.can be cut so they have equal performance. It all depends on what you order.
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  #3  
Old 09-10-2018, 08:38 AM
rocketman1988 rocketman1988 is offline
 
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Default Data please

I would like to see the hard data on a fixed pitch prop being equivalent to a c/s prop. Call it engineering curiosity...or skepticism...
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  #4  
Old 09-10-2018, 09:05 AM
Masterplumber Masterplumber is offline
 
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My first RV was a 7A that had a three blade MT prop. I sold that and then built an RV10 with a two blade prop. Both have been nice aircraft. I've put about 500 hours on each of them.
I think the 7A was a bit slow and I agree with the notion about top speed being slower. It was a good prop though and I was pleased with it.
The RV 10 performs nicely and I am happy with it also.
I liked the three blade because I liked the way it looked and of course the MT quality. However, it was really a pain to take off the lower cowl with the third blade.
The two blade performs a little better (I think) and I find cowl removal a lot easier now. Climb is not an issue for me, though the three blade may be better in that regard. I don't know, both aircraft could climb very well.
I would choose a two blade if I needed another prop, all things considered. Of course, YMMV.

John Koonce
N78MU
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  #5  
Old 09-10-2018, 02:57 PM
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db1yg db1yg is offline
 
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Default 2 Blade vs 3 Blade

Hi Charlie,

I have done just that using Catto products. Do a search for:

2 Blade Catto vs 3 Blade Catto

My post is #15.

Hope this helps.

Cheers,

db
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  #6  
Old 09-10-2018, 04:50 PM
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Greg Arehart Greg Arehart is offline
 
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RV-9 with standard Sensenich aluminum prop vs. 3-blade Catto. Both have similar top speeds at 8500' DA (within measurement error). Both get me off the ground in about the same distance. I did not do specific climb tests, but don't think there was a lot of difference in climb performance. 3-blade is definitely smoother-running. And there is distinctly a weight/CG difference (42 lb for the aluminum prop vs. 14 for the Catto). 3-blade has more ground clearance, especially good if you are operating from non-paved strips.

That's my experience.

Greg
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  #7  
Old 09-10-2018, 08:47 PM
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charosenz charosenz is offline
 
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Default

Quote:
Originally Posted by db1yg View Post
Hi Charlie,

I have done just that using Catto products. Do a search for:

2 Blade Catto vs 3 Blade Catto

My post is #15.

Hope this helps.

Cheers,

db
I will thanks!
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  #8  
Old 09-10-2018, 08:48 PM
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charosenz charosenz is offline
 
Join Date: Aug 2009
Location: Longview, Wash
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Quote:
Originally Posted by Greg Arehart View Post
RV-9 with standard Sensenich aluminum prop vs. 3-blade Catto. Both have similar top speeds at 8500' DA (within measurement error). Both get me off the ground in about the same distance. I did not do specific climb tests, but don't think there was a lot of difference in climb performance. 3-blade is definitely smoother-running. And there is distinctly a weight/CG difference (42 lb for the aluminum prop vs. 14 for the Catto). 3-blade has more ground clearance, especially good if you are operating from non-paved strips.

That's my experience.

Greg
Greg what were the diameter of each prop. I.E. how much clearance did/do you gain switching to a 3 bladed prop?
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  #9  
Old 09-10-2018, 09:57 PM
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I liked the three blade because I liked the way it looked and of course the MT quality. However, it was really a pain to take off the lower cowl with the third blade.

Finger nail polish takes care of the scratches. 3 blade Catto are cool and effective
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  #10  
Old 09-10-2018, 11:21 PM
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charosenz charosenz is offline
 
Join Date: Aug 2009
Location: Longview, Wash
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Quote:
Originally Posted by db1yg View Post
Hi Charlie,

I have done just that using Catto products. Do a search for:

2 Blade Catto vs 3 Blade Catto

My post is #15.

Hope this helps.

Cheers,

db
Great thread thanks for that tip....

Charlie
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