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Proper prop

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john_ross25(at)yahoo.com
Guest

Posted: Sun Jul 13, 2008 3:19 pm Post subject: Proper prop

Can anyone give me any insight into the proper propeller selection for an O-200? I would like any input on not only a stock aluminum, but ground adjustable and in flight adjustable units.  Thanks.

  

 John Ross 

 Green Bay, WI

          [quote][b]

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n981ms(at)yahoo.com
Guest

Posted: Mon Jul 21, 2008 6:13 am Post subject: Proper prop

I am looking at the Sensenich ground adjustable.  Been flying with the Sensenich wood for 500 hours and pleased but would like to be able to tweak the performance.  You might not find any absolute specific prop recomendations in that the Lycoming and Continental Kitfox installations are not very common.  I did not choose aluminum trying to save precious weight on the nose of a heavy engine airplane.

S6/TD/IO240

Dublin, GA



--- On Sun, 7/13/08, John Ross <john_ross25(at)yahoo.com> wrote:

  	  Quote: 	
		  From: John Ross <john_ross25(at)yahoo.com>

Subject: Proper prop

To: kitfox-list(at)matronics.com

Date: Sunday, July 13, 2008, 7:16 PM



     Can anyone give me any insight into the proper propeller selection for an O-200? I would like any input on not only a stock aluminum, but ground adjustable and in flight adjustable units.  Thanks.

  

 John Ross 

 Green Bay, WI

 	  Quote: 	
		  

	


	


         [quote][b]

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JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Mon Jul 21, 2008 7:10 am Post subject: Re: Proper prop

You could not give a wood prop for any engine, there are several very good reasons that manufacturers have stopped using wood props.   You get balance problems due to moisture, they are extremely fragile, and most of all the efficiency sucks.  The prop is the fastest moving part of the airplane, the tips move around 500 MPH, and the wood prop has to be built much thicker and draggier than is desirable to make up for the weakness of the material.



Performance wise, you would be better off to use a modern prop.  If the aluminum is 4 pounds heavier, you would only have to add just over 1 pound to the tail.   Performance wise, saving 5 pounds by using a wood prop is a very poor tradeoff when you are giving up a lot of thrust and efficiency.



Mike

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Kolb MK-III Xtra, 912-S

n85ae

Joined: 14 Mar 2007
Posts: 403

Posted: Mon Jul 21, 2008 9:11 am Post subject: Re: Proper prop

Oh rats, somebody forgot to tell me that!!!! I guess I better run out to the

hangar and pull that wood Sensenich off the front of my IO-240 before it

blows into splinters!!!



Jeff



 	  Quote: 	
		  You could not give a wood prop for any engine, there are several very good reasons that manufacturers have stopped using wood props. You get balance problems due to moisture, they are extremely fragile, and most of all the efficiency sucks. The prop is the fastest moving part of the airplane, the tips move around 500 MPH, and the wood prop has to be built much thicker and draggier than is desirable to make up for the weakness of the material.

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Michel

Joined: 10 Jan 2006
Posts: 966
Location: Norway

Posted: Mon Jul 21, 2008 9:35 am Post subject: Proper prop

 	  Quote: 	
		   From: JetPilot [orcabonita(at)hotmail.com]

 You get balance problems due to moisture, they are extremely fragile, and most of

 all the efficiency sucks.


	


Perhaps, Mike. But with my Jabiru and direct drive, I must have a wood propeller. It's a simple two blades fixed pitch,  I have used it for 250 hours, it looks good and ... if performance sucks, I wouldn't know; I am not after performance but safety and simplicity.



Cheers,

Michel Verheughe,

Norway

Kitfox 3 - Jabiru 2200

<pre><b><font size  color="#000000" face="courier new,courier">

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Kitfox 3 - Jabiru 2200

Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Mon Jul 21, 2008 1:22 pm Post subject: Proper prop

550 hours on my wood prop, and I certainly haven't been sitting  

around waiting for the moisture to dry out. : ) If they are not  

'modern" somebody better tell Sensenich, because they are 10 weeks  

behind in making props to fill orders.

The Jabiru engine "requires" a wood prop to dampen out torsional  

vibrations, so I've been told, although the newer composition props  

are also being used on Jabirus, but definitely not metal.

Lynn Matteson

Kitfox IV Speedster

Jabiru 2200

Status: flying w/547+ hrs

On Jul 21, 2008, at 1:31 PM, Michel Verheughe wrote:

 	  Quote: 	
		  > From: JetPilot [orcabonita(at)hotmail.com]

> You get balance problems due to moisture, they are extremely  

> fragile, and most of

> all the efficiency sucks.

 Perhaps, Mike. But with my Jabiru and direct drive, I must have a  

 wood propeller. It's a simple two blades fixed pitch,  I have used  

 it for 250 hours, it looks good and ... if performance sucks, I  

 wouldn't know; I am not after performance but safety and simplicity.

 Cheers,

 Michel Verheughe,

 Norway

 Kitfox 3 - Jabiru 2200

 <pre><b><font size  color="#000000" face="courier new,courier">

 List">http://www.matronics.com/Navigator?Kitfox-List</a>

 forums.matronics.com</a>

 www.matronics.com/contribution</a>

 </b></font></pre>

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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM

dave

Joined: 22 Sep 2006
Posts: 1382

Posted: Mon Jul 21, 2008 5:40 pm Post subject: Re: Proper prop

 	  Quote: 	
		  You could not give a wood prop for any engine,prop has to be built much thicker and draggier than is desirable to make up for the weakness of the material. 



Performance wise, you would be better off to use a modern prop 	




Obviously you really don;t know. 



Dave

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