[NSRCA-discussion] Pipe Length for 18.1
Dr. Mike Harrison
drmikedds at sbcglobal.net
Wed Nov 29 12:16:25 AKST 2006
Dean and Dave
I don't seem to notice any of those issues. That doesn't mean it doesn't
occur. It could be with these props somehow those issues resolve
themselves. Also, you may be more keenly aware than I. I do fly pretty
much a light caramel exhaust and lots of smoke, but I have tons of power and
unlimited vertical. There are the days of much heat and much humidity with
crappy air that power may be affected, not sure.
I had the mixture control and the single shim and dual plugs. I now have no
mixture control, the original OS head, and 2 shims at the aforementioned
length. I am trying to fly a very deliberate moderate pace at about 150
meters using the 18.5x9.5. You would have to email Fred at APC to get
those. I typically fly about 1/3 to 2/3 throttle on horizontal and a
gradual transition to full on vertical. Plane weighs 11 lbs.
Dave, I believe you are correct, I will check, IF I REMEMBER!!!!!
Hope this helps
Mike
----- 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 2:50 PM
Subject: Re: [NSRCA-discussion] Pipe Length for 18.1
> Hi Mike,
> So do you encounter much richening of the mixture if you stand on the
> throttle in prolonged level flight?
> How about during just the tiniest bit of a dive at wide open throttle?
> 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 Dr. Mike
> Harrison
> Sent: Wednesday, November 29, 2006 2:52 PM
> To: NSRCA Mailing List
> 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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