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Static RPM for 100HP EA81 Subaru

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Mon Apr 02, 2007 3:06 pm Post subject: Static RPM for 100HP EA81 Subaru

Would someone with a 100HP EA81 Subaru conversion with a three blade  

Warp Drive prop tell me what static RPM they're getting and what  

pitch setting. I think I've been running mine too coarse and I'm  

going to try a finer pitch and would like some ballpark figures to  

compare my results to.



Thanks,



-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

do not archive.

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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

larry(at)macsmachine.com
Guest

Posted: Mon Apr 02, 2007 3:53 pm Post subject: Static RPM for 100HP EA81 Subaru

Bryan,

With current jetting, my EA81 goes to 5100 rpm static and I fly with the 

same prop set to 17-degrees. 

Pleased with this setting but that might change if I ever get a LRI 

installed.



Larry McFarland

do not archive



Bryan Martin wrote:

 	  Quote: 	
		   

 <bryanmmartin(at)comcast.net>



 Would someone with a 100HP EA81 Subaru conversion with a three blade 

 Warp Drive prop tell me what static RPM they're getting and what pitch 

 setting. I think I've been running mine too coarse and I'm going to 

 try a finer pitch and would like some ballpark figures to compare my 

 results to.



 Thanks,



 --Bryan Martin

 N61BM, CH 601 XL,

 RAM Subaru, Stratus redrive.

 do not archive.

- The Matronics Stratus-List Email Forum -

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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gkrysztopik(at)satx.rr.co
Guest

Posted: Mon Apr 02, 2007 4:04 pm Post subject: Static RPM for 100HP EA81 Subaru

Would someone with a 100HP EA81 Subaru conversion with a three blade  

Warp Drive prop tell me what static RPM they're getting and what  

pitch setting. I think I've been running mine too coarse and I'm  

going to try a finer pitch and would like some ballpark figures to  

compare my results to.



Here's what I get on my plane (engine rpm (prop rpm));



 



warp       3-blade, 70", square tip



stratus    2.2:1 reduction, 100 HP at 5400 rpm    



                                                                      



pitch       static                climb                         WOT

level



                                                                      



12 deg    4800 (2182)       5000 (2272)               5400+ (2454)



14 deg    4600 (2091)       4800 (2182)               5000 (2272)



  16 deg   4200 (1909)                                       4600 (2091)



 



gary

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Mon Apr 02, 2007 5:54 pm Post subject: Static RPM for 100HP EA81 Subaru

Are you measuring the pitch right at the tip or at some other point  

on the blade? My Warp drive documentation says to measure at the tip  

of the prop. With my prop set at 17 degrees I only get about 4500  

static.



On Apr 2, 2007, at 8:52 PM, LarryMcFarland wrote:



 	  Quote: 	
		   

 <larry(at)macsmachine.com>



 Bryan,

 With current jetting, my EA81 goes to 5100 rpm static and I fly  

 with the same prop set to 17-degrees. Pleased with this setting but  

 that might change if I ever get a LRI installed.



 Larry McFarland


	


-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

do not archive.

- The Matronics Stratus-List Email Forum -

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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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

larry(at)macsmachine.com
Guest

Posted: Tue Apr 03, 2007 6:10 am Post subject: Static RPM for 100HP EA81 Subaru

Bryan,

I use the tip of the blade to attach the pitch measuring gage.  I did 

send my heads to RAM Performance and h.p. could be a factor. 

I have to tie off the landing gear facing into the wind with two ropes 

going back to the trailer hitch on my Saturn.  In max cruise,

currently, the plane will go another 300 rpm.  I have a VDO tach and the 

one on my EIS System and they're always within 100 rpm

of agreement.  Static tests were last conducted summer of 06 in rather 

warm conditions.

Larry McFarland

do not archive

Bryan Martin wrote:

 	  Quote: 	

 <bryanmmartin(at)comcast.net>

 Are you measuring the pitch right at the tip or at some other point on 

 the blade? My Warp drive documentation says to measure at the tip of 

 the prop. With my prop set at 17 degrees I only get about 4500 static.

 On Apr 2, 2007, at 8:52 PM, LarryMcFarland wrote:

> 

> <larry(at)macsmachine.com>

>

> Bryan,

> With current jetting, my EA81 goes to 5100 rpm static and I fly with 

> the same prop set to 17-degrees. Pleased with this setting but that 

> might change if I ever get a LRI installed.

>

> Larry McFarland

 --Bryan Martin

 N61BM, CH 601 XL,

 RAM Subaru, Stratus redrive.

 do not archive.

- The Matronics Stratus-List Email Forum -

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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larry(at)macsmachine.com
Guest

Posted: Tue Apr 03, 2007 7:40 am Post subject: Static RPM for 100HP EA81 Subaru

Bryan,

I think I've quoted you apples and oranges.  What was written for rpm in 

06 runups

and the rpms seen in Gary's data tends to suggest I could not have been 

getting 5100 rpm

static at the pitch I'm using now.  Please disregard my static number as 

I believe it doesn't

agree with the pitch that was actually used last year.  Too great a 

range of difference as

I use the same prop but was taking data for rpms when the pitch was 

being adjusted.

Another case of the fingers getting ahead of the brain.........



Larry McFarland



gary wrote:

 	  Quote: 	
		   

 Would someone with a 100HP EA81 Subaru conversion with a three blade  

 Warp Drive prop tell me what static RPM they're getting and what  

 pitch setting. I think I've been running mine too coarse and I'm  

 going to try a finer pitch and would like some ballpark figures to  

 compare my results to.



 Here's what I get on my plane (engine rpm (prop rpm));



  



 warp       3-blade, 70", square tip



 stratus    2.2:1 reduction, 100 HP at 5400 rpm    



                                                                       



 pitch       static                climb                         WOT

 level



                                                                       



 12 deg    4800 (2182)       5000 (2272)               5400+ (2454)



 14 deg    4600 (2091)       4800 (2182)               5000 (2272)



   16 deg   4200 (1909)                                       4600 (2091)



  



 gary

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bryanmmartin

Joined: 10 Jan 2006
Posts: 1018

Posted: Tue Apr 03, 2007 12:57 pm Post subject: Static RPM for 100HP EA81 Subaru

I just set my prop pitch to 14º and I'm getting 4900 static and 5200  

WOT at 130 mph IAS. At 4400 I can still get about 105 mph so I think  

I'm about where I aught to be. Thanks for the responses.

-- 

Bryan Martin

N61BM, CH 601 XL,

RAM Subaru, Stratus redrive.

do not archive.

- The Matronics Stratus-List Email Forum -

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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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive.

Billvt

Joined: 10 Jan 2006
Posts: 14

Posted: Tue Apr 03, 2007 2:38 pm Post subject: Static RPM for 100HP EA81 Subaru

Bryan,

  

 I initially had my prop pitch at 12.5 degrees and had a static RPM of 4900 RPM

  

 I now am at 15 degrees but have not checked the static RPM at that pitch setting

  

 Bill

   [quote][b]

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