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377 prop

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capedavis(at)yahoo.com
Guest

Posted: Mon May 13, 2013 10:50 am Post subject: 377 prop

Kolbers , Old timers? What prop would anyone choose for a Firefly with a 377 b-box 2.58 to 1 I have choices when buying I can take any one of these 2 blade props ---54X27----58X28----60X28 I am leaning towards the 60X28 thinking if its too much i could take some length out? Thanks  in advance  I know its old but so am I, lol, some of you guys must have had a 377 ? Chris



 

Chris Davis

KXP 503 492 hrs

Glider Pilot

Disabled from crash building Firefly



 [quote][b]

rowedenny

Joined: 09 Mar 2008
Posts: 338
Location: Western PA

Posted: Mon May 13, 2013 11:11 am Post subject: 377 prop

Chris,

Going buy my experience with 30hp Cuyuna engines and 2 to 1 belt drives, the 60 x 28 sounds close for a 377 and your gearbox. The 54 x 27 would cause a healthy 377 to over rev as that is the prop that worked on a 30hp Cuyuna and a 2 to 1 reduction on Pterodactyl Ascenders. A much slower plane than a Firefly.



Skid Rowe



On May 13, 2013, at 2:49 PM, chris davis <capedavis(at)yahoo.com (capedavis(at)yahoo.com)> wrote:

[quote]Kolbers , Old timers? What prop would anyone choose for a Firefly with a 377 b-box 2.58 to 1 I have choices when buying I can take any one of these 2 blade props ---54X27----58X28----60X28 I am leaning towards the 60X28 thinking if its too much i could take some length out? Thanks  in advance  I know its old but so am I, lol, some of you guys must have had a 377 ? Chris



 

Chris Davis

KXP 503 492 hrs

Glider Pilot

Disabled from crash building Firefly



  	  Quote: 	
		  



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[b]

rowedenny

Joined: 09 Mar 2008
Posts: 338
Location: Western PA

Posted: Mon May 13, 2013 11:19 am Post subject: 377 prop

By, going by...... Lol 

Please do not archive



Skid Rowe



On May 13, 2013, at 3:10 PM, Dennis Rowe <rowedenny(at)windstream.net (rowedenny(at)windstream.net)> wrote:

[quote]Chris,

Going buy my experience with 30hp Cuyuna engines and 2 to 1 belt drives, the 60 x 28 sounds close for a 377 and your gearbox. The 54 x 27 would cause a healthy 377 to over rev as that is the prop that worked on a 30hp Cuyuna and a 2 to 1 reduction on Pterodactyl Ascenders. A much slower plane than a Firefly.



Skid Rowe



On May 13, 2013, at 2:49 PM, chris davis <capedavis(at)yahoo.com (capedavis(at)yahoo.com)> wrote:

 	  Quote: 	
		  Kolbers , Old timers? What prop would anyone choose for a Firefly with a 377 b-box 2.58 to 1 I have choices when buying I can take any one of these 2 blade props ---54X27----58X28----60X28 I am leaning towards the 60X28 thinking if its too much i could take some length out? Thanks  in advance  I know its old but so am I, lol, some of you guys must have had a 377 ? Chris



 

Chris Davis

KXP 503 492 hrs

Glider Pilot

Disabled from crash building Firefly



  	  Quote: 	
		  



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://www.matronics.com/Navigator?Kolb-List

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cs.com

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matronics.com/contribution

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cs.com

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matronics.com/contribution

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[b]

John Hauck

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

Posted: Mon May 13, 2013 1:31 pm Post subject: 377 prop

Kolbers , Old timers? What prop would anyone choose for a Firefly with a 377 b-box 2.58 to 1 I have choices when buying I can take any one of these 2 blade props ---54X27----58X28----60X28 I am leaning towards the 60X28 thinking if its too much i could take some length out? Thanks  in advance  I know its old but so am I, lol, some of you guys must have had a 377 ? Chris



 



Chris Davis

 

 

 

 

Chris D/Kolbers:

 

A Jim Culver 60X30 was perfect with a 447 on my original Firestar.

 

A Jim Culver 50X30 was perfect with my Cuyuna ULII02 on my Ultrastar.  Can't remember what the ratio was for Homer's belt drive.

 

john h

mkIII

Titus, Alabama



[quote] [b]

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

Dana

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

Posted: Mon May 13, 2013 1:43 pm Post subject: 377 prop

At 03:10 PM 5/13/2013, Dennis Rowe wrote:

  	  Quote: 	
		  Chris,

 Going buy my experience with 30hp Cuyuna engines and 2 to 1 belt drives, the 60 x 28 sounds close for a 377 and your gearbox. The 54 x 27 would cause a healthy 377 to over rev as that is the prop that worked on a 30hp Cuyuna and a 2 to 1 reduction on Pterodactyl Ascenders. A much slower plane than a Firefly. 	


 The Cuyuna and the 377 are both rated at 35HP at 6500 rpm, so they should be able to use the same prop with the same redrive.  The Cuyuna on the Ultrastar uses a 50x30 prop with a 2:1 ratio, though it's only the limited clearance that mandated such a small prop.



 Dana



 

 --

 Wernher von Braun settled for a V-2 instead of a V-8.   

    [quote][b]

capedavis(at)yahoo.com
Guest

Posted: Mon May 13, 2013 3:39 pm Post subject: 377 prop

Dana Thanks for your opinion, it is very close to my thoughts; 

 Chris Davis

  

 KXP 503 492 hrs

Glider Pilot

Disabled from crash building Firefly

 

  	  Quote: 	
		      

From: Dana Hague <d-m-hague(at)comcast.net>

To: kolb-list(at)matronics.com 

Sent: Monday, May 13, 2013 5:35 PM

Subject: Re: 377 prop



 

 At 03:10 PM 5/13/2013, Dennis Rowe wrote:

  	  Quote: 	
		  Chris,

Going buy my experience with 30hp Cuyuna engines and 2 to 1 belt drives, the 60 x 28 sounds close for a 377 and your gearbox. The 54 x 27 would cause a healthy 377 to over rev as that is the prop that worked on a 30hp Cuyuna and a 2 to 1 reduction on Pterodactyl Ascenders. A much slower plane than a Firefly. 	


The Cuyuna and the 377 are both rated at 35HP at 6500 rpm, so they should be able to use the same prop with the same redrive.  The Cuyuna on the Ultrastar uses a 50x30 prop with a 2:1 ratio, though it's only the limited clearance that mandated such a small prop.



Dana

 --

 Wernher von Braun settled for a V-2 instead of a V-8.   

 	  Quote: 	
		  



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capedavis(at)yahoo.com
Guest

Posted: Mon May 13, 2013 3:45 pm Post subject: 377 prop

Skid , Thanks for your input ,I think I will take the 60X28 and see what it turns then go for a new prop depending on the results! Chris

  

 

  

 Chris Davis

KXP 503 492 hrs

Glider Pilot

Disabled from crash building Firefly

 

 [quote]    

From: Dennis Rowe <rowedenny(at)windstream.net>

To: "kolb-list(at)matronics.com" <kolb-list(at)matronics.com> 

Sent: Monday, May 13, 2013 3:18 PM

Subject: Re: 377 prop



 

   By, going by...... Lol 

 Please do not archive



Skid Rowe 

 

On May 13, 2013, at 3:10 PM, Dennis Rowe <rowedenny(at)windstream.net (rowedenny(at)windstream.net)> wrote:

  	  Quote: 	
		    Chris,

 Going buy my experience with 30hp Cuyuna engines and 2 to 1 belt drives, the 60 x 28 sounds close for a 377 and your gearbox. The 54 x 27 would cause a healthy 377 to over rev as that is the prop that worked on a 30hp Cuyuna and a 2 to 1 reduction on Pterodactyl Ascenders. A much slower plane than a Firefly.



Skid Rowe 

 

On May 13, 2013, at 2:49 PM, chris davis <capedavis(at)yahoo.com (capedavis(at)yahoo.com)> wrote:

  	  Quote: 	
		     Kolbers , Old timers? What prop would anyone choose for a Firefly with a 377 b-box 2.58 to 1 I have choices when buying I can take any one of these 2 blade props ---54X27----58X28----60X28 I am leaning towards the 60X28 thinking if its too much i could take some length out? Thanks  in advance  I know its old but so am I, lol, some of you guys must have had a 377 ? Chris

 

  

 Chris Davis

KXP 503 492 hrs

Glider Pilot

Disabled from crash building Firefly



 	  Quote: 	
		  



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[b]

wakataka

Joined: 11 Aug 2012
Posts: 48

Posted: Mon May 13, 2013 6:37 pm Post subject: Re: 377 prop

I ran a 60x26 on a 277 (free air, not fan cooled) and I needed more pitch. You wouldn't want anything flatter than 60x28 on a 377. In fact, that might not be enough. I run a Warp Drive on my 377, so I couldn't tell you what pitch it runs at, but I know it has a lot more power than the 277 on my other airplane.

_________________
There is something fascinating about science. One gets such wholesale returns of conjecture out of such a trifling investment of fact.

Mark Twain

WhiskeyVictor36(at)aol.co
Guest

Posted: Mon May 13, 2013 9:08 pm Post subject: 377 prop

Chris/All

  

 FYI

  

 I built an original (1985 model) FireStar with the (5)  rib wing.  It is very similar to the Firefly but has a wider wing  span.  The kit came with a 377 Rotax with the 2.58 gear  box.    The propeller provided was a wood Tennessee 66" X  28".  It performed well.

  

 I have since installed a Rotax 447 with a 2.58 gear box and I  use a 66" X 32" wood TN prop and it also performs well.

  

  Bill  Varnes

Audubon, NJ

85 Kolb FireStar



  

  

  In a message dated 5/13/2013 2:50:14 P.M. Eastern Daylight Time,  capedavis(at)yahoo.com writes:

  	  Quote: 	
		  Old timers? What prop would anyone choose for a Firefly    with a 377 B-box 2.58     

	


  

  

 [quote][b]

Thom Riddle

Joined: 10 Jan 2006
Posts: 1597
Location: Buffalo, NY, USA (9G0)

Posted: Tue May 14, 2013 2:54 am Post subject: Re: 377 prop

My early (5 rib) Firestar with 377 had a 60" IVO ground adjustable prop. It was fairly light at 317 lb empty. It performed as well or better than the other early Firestar (also 5-rib) with 447 and 62" Power Fin prop, 362 lb empty. 



Both had the 2.58:1 B-box. With 2-stroke engines, especially the somewhat cantankerous 447, having a ground adjustable prop enables fine tuning to get the EGT and CHTs where they belong.

_________________
Thom Riddle
Buffalo, NY (9G0)

Don't worry about old age... it doesn't last very long.
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