Return-Path: Received: from [65.54.168.116] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2898758 for flyrotary@lancaironline.net; Sat, 20 Dec 2003 13:32:10 -0500 Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Sat, 20 Dec 2003 10:32:09 -0800 Received: from 64.159.104.232 by bay3-dav12.bay3.hotmail.com with DAV; Sat, 20 Dec 2003 18:32:09 +0000 X-Originating-IP: [64.159.104.232] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: spintech, and exhaust size Date: Sat, 20 Dec 2003 13:32:07 -0500 MIME-Version: 1.0 X-Mailer: MSN Explorer 7.02.0011.2700 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0002_01C3C6FD.AA097D40" Message-ID: X-OriginalArrivalTime: 20 Dec 2003 18:32:09.0737 (UTC) FILETIME=[9402CF90:01C3C727] ------=_NextPart_001_0002_01C3C6FD.AA097D40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable No science (or very little) here either but I used 1.75" headers into a 2= 25" collector w/ 2.25" in/out of the Spintech. Tracy ----- Original Message ----- From: Russell Duffy Sent: Saturday, December 20, 2003 11:10 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: spintech, and exhaust size Mine spintech is a little smaller than Tracy's but I don't remember how m= uch. Again, as I remember the guy at Spintech didn't care about aircraft = use. Also, there was no scientific reason for the two inch in/out, and s= ome have recommended a smaller diameter, like 1.5 to 1.75. =20 Thanks for the info Tommy. The non-scientific reason for your 2" in/out = may have been that it's the minimum size Spintech lists :-) =20 I have a couple Racing Beat header flanges, and they have 2-1/8" holes. = I'll look at the actual port size, and see if maybe that can be cut down = a bit. The smaller diameter pipe would be easier to work with, but I cer= tainly don't want to make it so small that it hurts the flow at 7500 rpm.= =20 What diameter pipe are you guys using? Larger size after collector? =20 As for collectors, refer to the Spintech link- http://www.spintechmuffler= s.com/spintech/styleimages/index.htm Would #9 "Y-Collector/Center" be an effective collector, or is there not = enough pipe after the two join together to provide a good scavenging effe= ct? =20 Do you get any scavenging effect at all out of a design like #7, with dua= l inlets, and one outlet. =20 If you used a design like #10, with dual inlets and dual outlets, and the= n put a collector after the outlets. Would get any scavenging effect? =20 Sorry for all the questions, but I have a lot of catching up to do on exh= aust design. =20 I plan to be down your way the week after Christmas to fly again. Maybe = bring it to NC if it proves itself well enough. Regards, =20 Tommy<>< =20 Good luck. I'm sure you'll be happy to have the airplane at your new hom= e. =20 Cheers, Rusty (I'm already exhausted... sorry) ------=_NextPart_001_0002_01C3C6FD.AA097D40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

No science (or= very little) here either but I used 1.75" headers into a 2.25" coll= ector w/ 2.25" in/out of the Spintech.

Tracy=

----- Original Message -----
= From: Russell Duffy

Sent: Saturday, December 20, 2003 11:10 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: spintech, and exhaust size

=
Mine = spintech is a little smaller than Tracy's but I don't remember how much. = Again, as I remember the guy at Spintech didn't care about aircraft use.&= nbsp; Also, there was no scientific reason for the two inch in/out, and s= ome have recommended a smaller diameter, like 1.5 to 1.75. =

&nbs= p;

Thanks for the info Tommy. = The non-scientific reason for your 2" in/out may have been tha= t it's the minimum size Spintech lists :-) =

= ;

I have a couple Racing Beat head= er flanges, and they have 2-1/8" holes. I'll look at the actual por= t size, and see if maybe that can be cut down a bit.  The small= er diameter pipe would be easier to work with, but I certainly don't= want to make it so small that it hurts the flow at 7500 rpm.  =

<= FONT face=3DArial color=3D#0000ff>

What diamete= r pipe are you guys using?  Larger size after collector? <= /SPAN>

As for collectors, = refer to the Spintech link- http://www.spintechmufflers.com/spintech/st= yleimages/index.htm

Would #9 "Y-Collector/Center" be an effective collector, o= r is there not enough pipe after the two join together to provide a good = scavenging effect?

Do you get any scavenging effect at all out of a desig= n like #7, with dual inlets, and one outlet. <= /DIV>

=
= If you used a design like #10, with= dual inlets and dual outlets, and then put a collector after the outlets= Would get any scavenging effect?  =

=
Sorry for all the questions, but I have= a lot of catching up to do on exhaust design.   =

= ;

Rega= rds,

Tommy<><
=
=

<= SPAN class=3D650552903-20122003>Good luck. I'm sure you'll be happy to&n= bsp;have the airplane at your new home.

&n= bsp;

Cheers,<= /DIV>
Rusty (I'm already exhausted... so= rry)

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