X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.3.5) with ESMTP id 4215734 for flyrotary@lancaironline.net; Fri, 09 Apr 2010 12:36:59 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao104.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100409163623.LZSY27176.fed1rmmtao104.cox.net@fed1rmimpo01.cox.net> for ; Fri, 9 Apr 2010 12:36:23 -0400 Received: from BigAl ([72.192.128.205]) by fed1rmimpo01.cox.net with bizsmtp id 3UcN1e00F4S1t5C03UcNqv; Fri, 09 Apr 2010 12:36:22 -0400 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=3rYd4LfcKLU522ZHXfO06E856SAcXud2pffNCWjpFlA= c=1 sm=1 a=Vegc0WxVmH5BHtpNDyThtA==:17 a=Ia-xEzejAAAA:8 a=FWuEbgSlhnXFUThUIjgA:9 a=t572zITLgVfJYjJZRRYiRoFbSNgA:4 a=CjuIK1q_8ugA:10 a=EzXvWhQp4_cA:10 a=6i_Fx3e8WOCxU6GL:21 a=a_H3vYaR6B7LIQ6g:21 a=yMhMjlubAAAA:8 a=ucBeH_qX_xApzyqclrwA:9 a=lTWeWI_XiXGwxOeFJ5EA:7 a=QM6AoASvdoDPXAeAIJ-jNb34-C8A:4 a=Vegc0WxVmH5BHtpNDyThtA==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Tuned lengths Date: Fri, 9 Apr 2010 09:36:42 -0800 Message-ID: <2677499A5CDC44D29B31E632EFD6FAC8@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002C_01CAD7C8.29F1BD60" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Importance: Normal Thread-Index: AcrSf59fXdTFw4APTweOy+o97+NkOwFirNew In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_002C_01CAD7C8.29F1BD60 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable My understanding is that one advantage to using individual throttles as = you did was that it mitigated the effect of pulses between the intakes and tuning became less critical.=20 Where did you get the tubes to weld-up? I'm planning on making a = casting myself but it would nice to know alternate sources. Bill; I don't recall where I got the tube - there are a number of vendors. I think I bought U-bends which were then cut and welded. The tube size was chosen to have a circumference close to match that of the ports. The fabricator then made mandrels to shape the tubes to match the ports - = then welded into the water-jet cut flange. =20 Al =20 =20 =20 From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Thursday, April 01, 2010 5:06 PM To: Rotary motors in aircraft Subject: [FlyRotary] Tuned lengths =20 To: Rotary motors in aircraft Subject: [FlyRotary] Re: Tuned lengths =20 Please post drawings/photos/specs...Yvon =20 Some photos of the intake manifold for the 20B are attached. It is 4.5" = from flange to flange; the TB flange is at a slight angle to fit my = installation; the TB is TWM 3003; 44mm diameter bores. =20 Another builder built his from my drawings and had a couple extra made. = At least one is still available. The price is around $1000; I'll have to = check. That's a real deal - by the time I had mine fabricated and heat treated = it was over $2000. Let me know if anyone is interested. =20 Al ------=_NextPart_000_002C_01CAD7C8.29F1BD60 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

My understanding is that one advantage to using individual throttles as you = did was that it mitigated the effect of pulses between the intakes and = tuning became less critical.

Where did you get the tubes to weld-up?  I’m planning on making a = casting myself but it would nice to know alternate sources.

Bill;

I don’t recall where I got = the tube – there are a number of vendors.  I think I bought = U-bends which were then cut and welded. The tube size was chosen to have a = circumference close to match that of the ports.  The fabricator then made = mandrels to shape the tubes to match the ports – then welded into the = water-jet cut flange.

 

Al

 

 

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Thursday, April 01, 2010 5:06 = PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] = Tuned lengths

 

To:= Rotary motors in aircraft
Subject: [FlyRotary] Re: = Tuned lengths

 

=

Please post drawings/photos/specs...Yvon

 

Some photos of the intake manifold for the 20B are attached. It is 4.5” = from flange to flange; the TB flange is at a slight angle to fit my = installation; the TB is TWM 3003; 44mm diameter bores.

 

Another builder built his from my drawings and had a couple extra made.  At = least one is still available. The price is around $1000; I’ll have to = check. That’s a real deal – by the time I had mine fabricated and = heat treated it was over $2000.  Let me know if anyone is = interested.

 

Al

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