[NSRCA-discussion] Pipe Length for 18.1

[Jim Woodward]

Interesting. I used a pipe length of about 12" to get 8200 rpms on the
18.1x10.1.  Oh wait - that is my YS 160....

Jim W.


 
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Dean Pappas
Sent: Wednesday, November 29, 2006 9:55 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Pipe Length for 18.1


Hi Anthony,
Yes! The pipe length specified in cubits ..." What's a cubit?" "Let's see, I
used to know what a cubit was." 
The stock OS header plus a Hattori 900 pipe yields 24" to the baffle. (1.33
cubits)
This is where I run my pipe length, using a Bolly 140 EQ, but I use a
throttle-coupled
mixture control needle valve to fix the fuel metering for the prop I use.
I also run rather rich with two glo-plugs and only one head gasket, which
already helps with the mid-range richness.
For must of us running two head gaskets, to stop the pinging, pipe lengths
maybe 25" to 26"  are more appropriate.
If I understand Mike, he runs at close to 25". 

later,
Dean


Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com


-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Anthony
Romano
Sent: Wednesday, November 29, 2006 9:16 AM
To: nsrca-discussion at lists.nsrca.org
Subject: [NSRCA-discussion] Pipe Length for 18.1



Interesting comments will have to give on of these a try. I like to have 
more speed available so the  18.1 X 10.1  sounds more appropriate than the 
W. Am I correct on this?
Does anyone have a pipe length glow plug to baffle since I cut my headers? 
Inches, MM, cubits, etc.

Anthony

>From: "Dave Smith" <davidsmith at ns.sympatico.ca>
>Reply-To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
>Subject: Re: [NSRCA-discussion] Pipe Length
>Date: Tue, 28 Nov 2006 18:00:17 -0400
>
>Thanks Mike.  I ran this prop for a few flights on the same pipe setting as

>I used for a 16x12.5 wide APC,and 15% Cool Power. It would turn about 
>7400,but I backed off the needle so that it barely touched 7200.  It pulled

>a 10.75 lb.
>Brio surprisingly well but certainly not well enough on verticals.
>My mistake in misnaming the fuel I intend to use.
>
>Thanks again
>
>Dave
>   ----- Original Message -----
>   From: Dr. Mike Harrison
>   To: NSRCA Mailing List
>   Sent: Tuesday, November 28, 2006 5:38 PM
>   Subject: Re: [NSRCA-discussion] Pipe Length
>
>
>   One more thing, the Cool Power is 20% Problend.
>   Mike
>     ----- Original Message -----
>     From: Dave Smith
>     To: NSRCA Mailing List
>     Sent: Tuesday, November 28, 2006 2:46 PM
>     Subject: [NSRCA-discussion] Pipe Length
>
>
>     What would be a good starting point to set an ES tuned pipe,Model 2C 
>140MU on an OS 140 RX,(w/extra head shim and OS "F" plug),running on Cool 
>Power 20/20?
>
>     Prop is APC 18.1x10.1W.
>
>     Thans,Dave  NSRCA  #943
>
>
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