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Prop tests finally over

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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Wed Nov 10, 2010 9:01 pm Post subject: Prop tests finally over

After gradually creeping up on the right pitch setting for the 4 blade reduced to 2 Power Fin and a day without screaming winds I was able to do as direct a comparison as I was capable of this afternoon. When all was said and done, the completely wrong 3 blade Warp Drive won by 3 mph. About the only thing that came out of the test was that I get less pitch change with power changes now that I've added another 1/4" to the rear motor mounts for a total of 1/2". I suppose that's worth something. 



Rick Girard



-- 

Zulu Delta

Kolb Mk IIIC

582 Gray head

4.00 C gearbox

3 blade WD

Thanks, Homer GBYM

It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.

  - G.K. Chesterton



 



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_________________
The smallest miracle right in front of you is enough to make you happy....

neilsenrm(at)gmail.com
Guest

Posted: Thu Nov 11, 2010 8:15 am Post subject: Prop tests finally over

Rick

  

 I'm sure you know but to do a true test between a two blade and a three blade prop you need to change the length of the props. If you have room you need to fit a longer blade to the two blade prop. A correctly sized two blade prop will out perform a tree blade prop. A three blade prop is better if you don't have room to swing a longer two blade prop. A three blade prop is normally much smoother and quieter than a two blade prop especially on a pusher. 

 

 Rick Neilsen

 Redrive VW Powered MKIIIC



 On Wed, Nov 10, 2010 at 11:54 PM, Richard Girard <aslsa.rng(at)gmail.com (aslsa.rng(at)gmail.com)> wrote:

 [quote]After gradually creeping up on the right pitch setting for the 4 blade reduced to 2 Power Fin and a day without screaming winds I was able to do as direct a comparison as I was capable of this afternoon. When all was said and done, the completely wrong 3 blade Warp Drive won by 3 mph. About the only thing that came out of the test was that I get less pitch change with power changes now that I've added another 1/4" to the rear motor mounts for a total of 1/2". I suppose that's worth something.  



 Rick Girard

 

-- 

 Zulu Delta

 Kolb Mk IIIC

 582 Gray head

 4.00 C gearbox

 3 blade WD

 Thanks, Homer GBYM

 



 It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.

  - G.K. Chesterton

 





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williamtsullivan(at)att.n
Guest

Posted: Thu Nov 11, 2010 8:47 am Post subject: Prop tests finally over

Can someone explain why I usually see the three blade on a Firefly, and a two blade on a Firestar- both with the 447?



                                           Bill Sullivan

                                           Windsor Locks, Ct.

                                           FS 447, WD 2 blade

--- On Thu, 11/11/10, Richard Neilsen <neilsenrm(at)gmail.com> wrote:



  	  Quote: 	
		  

   I'm sure you know but to do a true test between a two blade and a three blade prop you need to change the length of the props. If you have room you need to fit a longer blade to the two blade prop. A correctly sized two blade prop will out perform a tree blade prop. A three blade prop is better if you don't have room to swing a longer two blade prop. A three blade prop is normally much smoother and quieter than a two blade prop especially on a pusher. 



  

 	  Quote: 	
		  

	


	
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rickofudall

Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA

Posted: Thu Nov 11, 2010 10:04 am Post subject: Prop tests finally over

Richard, The Power Fin was an inch longer. Not enough to make a real difference, I know, but some. I was hoping for parity between the two and was a bit surprised that the 2 blade did not at least equal the 3.What truly amazed me was the initial test when the 4 blade was mounted on the 582 and the engine couldn't pull it. Makes me really wonder what a properly set up HKS could do on the Mk III. I have the coming winter to decide about that.

 



Rick



On Thu, Nov 11, 2010 at 10:44 AM, william sullivan <williamtsullivan(at)att.net (williamtsullivan(at)att.net)> wrote:

 	  Quote: 	
		     Can someone explain why I usually see the three blade on a Firefly, and a two blade on a Firestar- both with the 447?

 

                                           Bill Sullivan

                                           Windsor Locks, Ct.

                                           FS 447, WD 2 blade

--- On Thu, 11/11/10, Richard Neilsen <neilsenrm(at)gmail.com (neilsenrm(at)gmail.com)> wrote:

 



  	  Quote: 	
		  

   I'm sure you know but to do a true test between a two blade and a three blade prop you need to change the length of the props. If you have room you need to fit a longer blade to the two blade prop. A correctly sized two blade prop will out perform a tree blade prop. A three blade prop is better if you don't have room to swing a longer two blade prop. A three blade prop is normally much smoother and quieter than a two blade prop especially on a pusher. 

 

  

 	  Quote: 	
		  

	


	


  	  Quote: 	
		  



_blank">www.aeroelectric.com

.com" target="_blank">www.buildersbooks.com

="_blank">www.homebuilthelp.com

_blank">http://www.matronics.com/contribution

get="_blank">http://www.matronics.com/Navigator?Kolb-List

tp://forums.matronics.com

	
	


-- 

Zulu Delta

Kolb Mk IIIC

582 Gray head

4.00 C gearbox

3 blade WD

Thanks, Homer GBYM

 



It is not bigotry to be certain we are right; but it is bigotry to be unable to imagine how we might possibly have gone wrong.

 - G.K. Chesterton

 

 

  [quote][b]

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
The smallest miracle right in front of you is enough to make you happy....

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