[NSRCA-discussion] Pipe Length for 18.1

Wed Nov 29 11:51:00 AKST 2006

Mike:   Using the method you gave me yesterday,my measurement is about 26 
inches from baffle to glow plug in a straight line.
If taking the bend in the OS header into consideration,one should add maybe 
3/8th - 1/2 inch for a more true length.

Thanks,,,,,,,,Dave

----- Original Message ----- 
From: "Dr. Mike Harrison" <drmikedds at sbcglobal.net>
To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
Sent: Wednesday, November 29, 2006 3:51 PM
Subject: Re: [NSRCA-discussion] Pipe Length for 18.1

>I have got to remember to measure, I think I am closer to 26.5 inches
> ----- Original Message ----- 
> From: "Dean Pappas" <d.pappas at kodeos.com>
> To: "NSRCA Mailing List" <nsrca-discussion at lists.nsrca.org>
> Sent: Wednesday, November 29, 2006 8:57 AM
> Subject: Re: [NSRCA-discussion] Pipe Length for 18.1
>
>
>>I just realized, that qoute is probably more like "Riiiiight! What's a
>>cubit?"
>>
>> 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 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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