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  #11  
Old 01-27-2021, 07:04 AM
lonkelm lonkelm is offline
 
Join Date: Jul 2008
Location: Middletown, DE
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Default prop

I wouldn't think the aerodynamics of a RV10 versus other planes would be so different that similar conclusions couldn't be drawn. There is a lot of user data on Cessna 182 using 2 versus 3 blades, and the same plane with a Pponk upgrade higher horsepower using 2 versus 3 blades.

3 blades will give better ground clearance, should have an edge on climb performance, and will have more drag so the cruise speed will be lower on the 3 blade. How much difference would be make and model specific. A clean plane like a RV10 I would expect the difference to be larger. I think the difference on a Cessna 182 is 3-4 kts. So for a clean plane seeing 5-7 knots seems reasonable.
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  #12  
Old 01-27-2021, 10:14 AM
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Ironflight Ironflight is offline
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Quote:
Originally Posted by Reflex View Post
Nice comparison. Good to see somebody finally put a different prop on the same plane and made notes.

However, it should be noted that while the props were on the same plane, changing the length by 2" is likely to have a significant impact on performance. Seven knots is easily believable. Van's makes no recommendation on cutting the length when moving to a three bladed prop.

I spoke to multiple folks at Van's at Oshkosh a couple of years ago regarding 3 blade vs. 2 blade. The general consensus was that the 2 blade is faster. However, nobody had any hard data. In addition, there were two people I spoke to in the both that stated they believe the three blade is faster and climbs better...specifically the MT. Again, no hard data so support that opinion either.

Bottom line, right now on this board there is no hard data on the same plane being fitted/tested with multiple 2 and 3 bladed props and tested.
You mean like this?

https://vansairforce.net/community/s...d.php?t=185917

The problem is that it is hard to test a two blade vs. three blade in the same design family, which is what you’d really want to do to remove the variables of blade design and material. In the testing I did between the Hartzell metal BA and the Whirlwind 300, the blades are ten or fifteen years apart in design and the materials are completely different - so you are comparing apples to bananas if you’re just trying to tease out the difference due to the number of blades.

BTW - I have a new Hartzell “Explorer” three-blade coming to hang on the RV-8 to test it on the same platform as the other two. I am excited to see the differences!

Paul
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  #13  
Old 01-27-2021, 10:42 AM
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Mike S Mike S is online now
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I have a vague memory of Rob Hickman doing this-----I think.
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  #14  
Old 01-28-2021, 11:28 PM
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RV10inOz RV10inOz is offline
 
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Having tested back to back RV10's with 2 blade and three blade we found a 6-9 knot slower cruise with the 3 blade.

Another anomaly we found is higher CHT in the order of 40dF which we could not solve nor explain. May have been nothing to do with the prop, but the other two -10's were consistent with each other.
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  #15  
Old 01-29-2021, 12:26 AM
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DanH DanH is offline
 
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Quote:
Originally Posted by rkbrown819 View Post
Has anyone installed the Hartzell 3-bladed prop (C3Y1R-1N/N7605C) on their RV-10?
Anyone know the difference between a C3Y1R-1N and a C3YR-1N? The TCDS just says the extra "1" designates a hub design mod:

1 when used denotes hub design modification compatible only with certain blade models listed in the front of this Data Sheet
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