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prop selection

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guebbing(at)yahoo.com
Guest

Posted: Sat Jan 31, 2009 9:44 am Post subject: prop selection

Guys,

I'm building a firestar2 with a 503 DCDI 2.58 B gearbox and considering the Powerfin prop.

Any opinions on 2 blade vs. 3? Also those out there using this prop, what blade type/ length are you using B,C, or F combo. Just looking for info to make the right decision for me. Thanks,

 Gerry

            [quote][b]

zeprep251(at)aol.com
Guest

Posted: Sat Jan 31, 2009 10:30 am Post subject: prop selection

Gerry,

   You might want to consider the mass weight inertia of all 3 blades types before you buy. The B -Box has some limits.Most on this list favor the Powerfin or Warp over the Ivo, but the Ivo is the lightest I believe.

 

   

 

   

 

 --

George Alexander

Joined: 10 Jan 2006
Posts: 245
Location: SW Florida

Posted: Sat Jan 31, 2009 10:59 am Post subject: Re: prop selection

 	  guebbing(at)yahoo.com wrote: 	
		  Guys,

Any opinions on 2 blade vs. 3? Also those out there using this prop, what blade type/ length are you using B,C, or F combo. 

	




Gerry:

The setup on my FS II is a 3 blade Power Fin, Model F; C gearbox (3.47 ratio) being driven by the R503 DCDI/Dual Carb.

_________________
George Alexander
FS II R503
E-LSA N709FS
http://www.oh2fly.net

aslsa.rng(at)gmail.com
Guest

Posted: Sat Jan 31, 2009 11:02 am Post subject: prop selection

Gerry, I have a Powerfin on my HKS powered trike. The blades are light so the inertia is low, a good match for the limits of the B gearbox. They are easy to adjust accurately, and the factory gives very good support. If they have a weakness, it's that they are not terribly robust if something hard goes through them. I wiped out a blade when I forgot to take my glasses off my collar and the slipstream sent them flying. 



Rick



On Sat, Jan 31, 2009 at 11:33 AM, gerard uebbing <guebbing(at)yahoo.com (guebbing(at)yahoo.com)> wrote:

 	  Quote: 	
		   Guys,

I'm building a firestar2 with a 503 DCDI 2.58 B gearbox and considering the Powerfin prop.

Any opinions on 2 blade vs. 3? Also those out there using this prop, what blade type/ length are you using B,C, or F combo. Just looking for info to make the right decision for me. Thanks,

  Gerry

            3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D 3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D  [/b] 	
[b]

JetPilot

Joined: 10 Jan 2006
Posts: 1246

Posted: Sat Jan 31, 2009 11:13 am Post subject: Re: prop selection

I fly a powerfin on a Trike also, its a great prop.  We replaced the wooden prop that came on the trike with the powerfin.  The Powerfin gives more thrust, is smoother, and is quieter.  Better than the expensive french made wooden prop in every way.



I have a Warp drive on my 912-S, its very strong, exactly what I want for when something goes through the proppeller as does happen with pushers from time to time with pusher engines.  I also love the nickel leading edges for flying through rain.  No leading edge tapes to mess with and I can fly it into a thunderstorm with confidence 



I think both props are great !  But the Warp Drive may be to heavy for the B-Box, you would have to do the calculation to see if it is or not, but my guess it that the warp might be to heavy.



Mike

_________________
"NO FEAR" - If you have no fear you did not go as fast as you could have !!!

Kolb MK-III Xtra, 912-S

lucien

Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

Posted: Sat Jan 31, 2009 12:49 pm Post subject: Re: prop selection

[quote="guebbing(at)yahoo.com"]Guys,

I'm building a firestar2 with a 503 DCDI 2.58 B gearbox and considering the Powerfin prop.

Any opinions on 2 blade vs. 3? Also those out there using this prop, what blade type/ length are you using B,C, or F combo. Just looking for info to make the right decision for me. Thanks,

 Gerry

             	  Quote: 	
		  [b] 	




Friend of mine back in TX ran a tennessee 66x34 woodie on his FSII 503 B box and it worked really well. 



My FSII had the 3.47:1 C box on it with a 3 blade warp drive taper tip in 68" diameter. I could outclimb my friend's FSII but only by a very little bit.



Judging by those two planes, tho, my suggestion would be for a 2.58 ratio stick with a 2 blade of about 66" (i.e. the F model powerfin would be pretty good. The tennessee woodie is great too but may vibrate a little more). If you go 3 blade, I'd suggest gearing down to 3.47 with the C box and running a 68" warp drive. I tried a powerfin F model 68" 3 blade, but the warp drive worked a little better overall.



I'm also an RK-400 clutch fan, so going to C box would allow you to use that as well....



LS

_________________
LS
Titan II SS

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sat Jan 31, 2009 1:15 pm Post subject: prop selection

No leading edge tapes to mess with and I can fly into a thunderstorm with 

confidence [Wink]

 	  Quote: 	
		  

 > Mike
	




Confidence in what?  



john h

mkIII - Raking leaves and splitting firewood instead of flying this 

beautiful Sunday at hauck's holler.  Got an hour day before yesterday 

though.  912ULS is honking.  Climbing at 5400 and turning 5500 at WOT 

straight and level.  Will only fly 90 mph with the 8" Maule Tundra 

Tailwheel.  Will do 95 with a 6" solid Maule.  Sure works better on the 

ground though.

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

John Hauck

Joined: 09 Jan 2006
Posts: 4639
Location: Titus, Alabama (hauck's holler)

Posted: Sat Jan 31, 2009 1:17 pm Post subject: prop selection

That didn't put you down, did it?

  

 Did it require a blade replacement, or  repair?

  

 john h

 mkIII 

 [quote]   I wiped out a blade when I forgot to take my glasses off my collar and    the slipstream sent them flying.



    

   Rick

 

[b]

_________________
John Hauck
MKIII/912ULS
hauck's holler
Titus, Alabama

lucien

Joined: 03 Jun 2007
Posts: 721
Location: santa fe, NM

Posted: Sat Jan 31, 2009 1:43 pm Post subject: Re: prop selection

 	  aslsa.rng(at)gmail.com wrote: 	
		  Gerry, I have a Powerfin on my HKS powered trike. The blades are light so the inertia is low, a good match for the limits of the B gearbox. They are easy to adjust accurately, and the factory gives very good support. If they have a weakness, it's that they are not terribly robust if something hard goes through them. I wiped out a blade when I forgot to take my glasses off my collar and the slipstream sent them flying. 



Rick



	




For what it's worth, Powefin's newer props are more heavily made. I still have my F model that I'd bought to try on my FSII and its blades are a fair bit more robust than the F I had on my trike. It was evident even with a heft test, the newer blades are noticeably heavier, tho not by a lot.



The powerfin is the most efficient pusher you can buy. I could get 1800fpm sustained climb on my trike with its F model 2 blade. The only other prop that could come close was my tennessee woodie which gave about 1400 to 1500.



My F model 3 blade on the FSII did climb better than the warp drive set for the same rpms, but it didn't do well in cruise which is why I went back to the warp drive. The warp still gave the best overall performance....



LS

_________________
LS
Titan II SS

aslsa.rng(at)gmail.com
Guest

Posted: Sat Jan 31, 2009 6:14 pm Post subject: prop selection

I was able to do a field repair to keep flying that day, but afterward I decided to get a new blade. It just didn't make good sense to me to risk the aircraft for the cost of a single prop blade.



Rick

 

On Sat, Jan 31, 2009 at 3:07 PM, John Hauck <jhauck(at)elmore.rr.com (jhauck(at)elmore.rr.com)> wrote:

 	  Quote: 	
		          That didn't put you down, did it?

  

 Did it require a blade replacement, or  repair?

  

 john h

 mkIII 

  	  Quote: 	
		     I wiped out a blade when I forgot to take my glasses off my collar and    the slipstream sent them flying.



    

   Rick

 

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

[/b] 	


[b]

aslsa.rng(at)gmail.com
Guest

Posted: Sat Jan 31, 2009 6:34 pm Post subject: prop selection

When did Powerfin go to a heavier blade? I didn't get my prop until January of 2007.Lucien, I had a rice king and put the standard drive back in my C box. Why do you like them?

Rick

 do not archive

On Sat, Jan 31, 2009 at 3:43 PM, lucien <lstavenhagen(at)hotmail.com (lstavenhagen(at)hotmail.com)> wrote:

[quote] --> Kolb-List message posted by: "lucien" <lstavenhagen(at)hotmail.com (lstavenhagen(at)hotmail.com)>

 aslsa.rng(at)gmail.com wrote:

 > Gerry, I have a Powerfin on my HKS powered trike. The blades are light so the inertia is low, a good match for the limits of the B gearbox. They are easy to adjust accurately, and the factory gives very good support. If they have a weakness, it's that they are not terribly robust if something hard goes through them. I wiped out a blade when I forgot to take my glasses off my collar and the slipstream sent them flying.

  >

 > Rick

 >

 >

 For what it's worth, Powefin's newer props are more heavily made. I still have my F model that I'd bought to try on my FSII and its blades are a fair bit more robust than the F I had on my trike. It was evident even with a heft test, the newer blades are noticeably heavier, tho not by a lot.

 The powerfin is the most efficient pusher you can buy. I could get 1800fpm sustained climb on my trike with its F model 2 blade. The only other prop that could come close was my tennessee woodie which gave about 1400 to 1500.

 My F model 3 blade on the FSII did climb better than the warp drive set for the same rpms, but it didn't do well in cruise which is why I went back to the warp drive. The warp still gave the best overall performance....

 LS

 --------

 LS

 Titan II SS

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Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Sat Jan 31, 2009 7:12 pm Post subject: prop selection

At 09:00 PM 1/31/2009, Richard Girard wrote:

 	  Quote: 	
		  I was able to do a field repair to keep flying that day, but afterward I 

decided to get a new blade. It just didn't make good sense to me to risk 

the aircraft for the cost of a single prop blade.


	


Good move, as I've related before, some years ago I witnessed the bad crash 

of a MKIII due to the failure of a repaired Powerfin prop.



-Dana

--

  Drink wet cement, and get completely stoned!

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