X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail04.syd.optusnet.com.au ([211.29.132.185] verified) by logan.com (CommuniGate Pro SMTP 5.2.2) with ESMTPS id 2893696 for flyrotary@lancaironline.net; Mon, 05 May 2008 01:48:01 -0400 Received-SPF: pass receiver=logan.com; client-ip=211.29.132.185; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-126-84.dsl.nsw.optusnet.com.au [211.31.126.84]) by mail04.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id m455lDQj027709 for ; Mon, 5 May 2008 15:47:14 +1000 Message-ID: <00a601c8ae73$799a3340$6400a8c0@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Rotor Housings Date: Mon, 5 May 2008 15:47:14 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A3_01C8AEC7.4A2F5500" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_00A3_01C8AEC7.4A2F5500 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable The only number I have seen for lost HP was less than three with the = splitters. Exhaust design will be much easier with them. The tubes for your Pport should be thick walled and a light press fit, = in the inner wall in order to support the edges of the housing when the = stack is torqued up. Keeps the chrome from cracking. Fill in the water = void between inner and outer housing with an aluminum filled mechanical = epoxy. If there is no water, it can't leak. Devcon Plastic Aluminum if = you can find it. http://www.freemansupply.com/DevconEpoxyPlastic.htm The putty. Not the liquid.=20 Use a milling machine. Practice on a junk housing or two. Paul Yaw did = up a nice Pport and had the pictures on his web page. www.yawpower.com. = I'm on dial up until the 6th, so I didn't look through his stuff to see = if any of that was still there. Leave at least 1/2" of chrome on each = side to support the apex seal. I built one for a guy who ran it through two passes at an autocross = and never developed oil pressure.=20 Said it ran real good. It was in a Mini Cooper woody wagon. The engine = had set in his shop for two years before he ran it. (10 inch tires were = not enough) Keep runner (tube) ID about the same as the combined area of both = stock runners. High velocity is what you want. Bigger is not better = until you get closer to 10,000 RPM.=20 Cover all of the chrome you don't want ruined with three layers of = duct tape. Look for 200+ HP Lynn E. Hanover Lynn, I'm having a discussion off-list with a chap who is claiming the need = for 2" runners for runways over 10,000 ft and hot days - in other words = lower density situations where max power is needed over 10,000 ft. I = have suggested he look at velocity rather than size, but I feel he has a = mind-set. What do you think about his concerns for power at altitude, does this = add another dimension with PP sizing? I understand power will be down at altitude, but don't see how a = bigger port compensates for that. George ( down under) ------=_NextPart_000_00A3_01C8AEC7.4A2F5500 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

The only number I have seen for lost HP was less than three with = the=20 splitters. Exhaust design will be much easier with them.

The tubes for your Pport should be thick walled and a light press = fit, in=20 the inner wall in order to support the edges of the housing when the = stack is=20 torqued up. Keeps the chrome from cracking. Fill in the water void = between=20 inner and outer housing with an aluminum filled mechanical epoxy. If = there is=20 no water, it can't leak. Devcon Plastic Aluminum if you can find it. = http://www.f= reemansupply.com/DevconEpoxyPlastic.htm

The putty. Not the liquid.

Use a milling machine. Practice on a junk housing or two. Paul = Yaw did up=20 a nice Pport and had the pictures on his web page. www.yawpower.com. I'm on dial up = until the=20 6th, so I didn't look through his stuff to see if any of that was = still=20 there. Leave at least 1/2" of chrome on each side to support the apex=20 seal.

I built one for a guy who ran it through two passes at an = autocross=20 and never developed oil pressure.

Said it ran real good. It was in a Mini Cooper woody wagon. The = engine=20 had set in his shop for two years before he ran it. (10 inch = tires were=20 not enough)

Keep runner (tube) ID about the same as the combined area of both = stock=20 runners. High velocity is what you want. Bigger is not better until = you get=20 closer to 10,000 RPM.

Cover all of the chrome you don't want ruined with three layers = of duct=20 tape.

Look for 200+ HP

Lynn E. Hanover

Lynn,

I'm having a discussion off-list with a chap who is claiming the = need for=20 2" runners for runways over 10,000 ft and hot days - in other words = lower=20 density situations where max power is needed over 10,000 ft. I = have=20 suggested he look at velocity rather than size, but I feel he has a=20 mind-set.

What do you think about his concerns for power at altitude, does = this add=20 another dimension with PP sizing?

I understand power will be down at altitude, but don't see how a = bigger=20 port compensates for that.

George ( down under)

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