Return-Path: Received: from [204.127.202.59] (HELO sccrmhc11.comcast.net) by logan.com (CommuniGate Pro SMTP 4.3c3) with ESMTP id 824297 for flyrotary@lancaironline.net; Sat, 26 Mar 2005 21:55:07 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.202.59; envelope-from=kenpowell@comcast.net Received: from 204.127.205.142 (unknown[204.127.205.159](misconfigured sender)) by comcast.net (sccrmhc14) with SMTP id <2005032702542401400j6fqae>; Sun, 27 Mar 2005 02:54:24 +0000 Received: from [68.51.45.41] by 204.127.205.142; Sun, 27 Mar 2005 02:54:23 +0000 From: kenpowell@comcast.net To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: [FlyRotary]RX8 P-Port Date: Sun, 27 Mar 2005 02:54:23 +0000 Message-Id: <032720050254.27203.4246205F00090D3900006A43220700320104040A99019F020A05@comcast.net> X-Mailer: AT&T Message Center Version 1 (Dec 17 2004) X-Authenticated-Sender: a2VucG93ZWxsQGNvbWNhc3QubmV0 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_27203_1111892063_0" --NextPart_Webmail_9m3u9jl4l_27203_1111892063_0 Content-Type: text/plain Content-Transfer-Encoding: 8bit Hi George, I don't think we need to worry about apex seals in a non-turbo motor. Tracy's or Hurley's 2mm seals will never break in a NA motor since there is no problem with detonation. I just took some measurements of a '88 13b rotor: width measurements around the outside of the rotor showed 3.136 - 3.139 inches. Inside measurements from the gear face to the opposite side of the rotor (measured inside the bearing shell) was 3.144 to 3.145 inches. I do not have micrometers large enough to measure from an apex seal groove to the opposite curved face of the rotor. I don't have CAD capability so I can't send a drawing; can someone draw this up for us??? We need to compare these measurements to a RX8 rotor to see if the RX8 rotor will fit in the 'hole' of the earlier 13b's. Ken Powell Bryant, Arkansas 501-847-4721 -------------- Original message -------------- Ken, That's very true, and what I plan on doing for the single, do you think it's worth going to 3mm for a non - turbo single rotor? The RX8 rotors are dirt cheap ( compared to new RX8 rotors) What dimensions do you want measured - I will do it for you! George ( down under) I don't see the need for a 'bridged' intake port on the RX8 engine. The RX8 also uses a 2mm apex seal; I think we can grind the RX8 rotor apex seal groove to the same depth as the older rotors then use Tracy's or Hurley's 2mm spex seals in a peripheral ported Renesis. You should be also be able to use the lighter 8.7 lb RX8 rotors in the older engines if you get the rotating assembly balanced. Wish I had a RX8 rotor so I could measure the critical dimensions (but not bad enough to buy one!(grin)). Ken Powell Bryant, Arkansas 501-847-4721 --NextPart_Webmail_9m3u9jl4l_27203_1111892063_0 Content-Type: text/html Content-Transfer-Encoding: 8bit

Hi George,

I don't think we need to worry about apex seals in a non-turbo motor. Tracy's or Hurley's 2mm seals will never break in a NA motor since there is no problem with detonation. I just took some measurements of a '88 13b rotor: width measurements around the outside of the rotor showed 3.136 - 3.139 inches. Inside measurements from the gear face to the opposite side of the rotor (measured inside the bearing shell) was 3.144 to 3.145 inches. I do not have micrometers large enough to measure from an apex seal groove to the opposite curved face of the rotor. I don't have CAD capability so I can't send a drawing; can someone draw this up for us??? We need to compare these measurements to a RX8 rotor to see if the RX8 rotor will fit in the 'hole' of the earlier 13b's.

Ken Powell
Bryant, Arkansas
501-847-4721

-------------- Original message --------------

Ken,

That's very true, and what I plan on doing for the single, do you think it's worth going to 3mm for a non - turbo single rotor?

The RX8 rotors are dirt cheap ( compared to new RX8 rotors) What dimensions do you want measured - I will do it for you!

George ( down under)

I don't see the need for a 'bridged' intake port on the RX8 engine. The RX8 also uses a 2mm apex seal; I think we can grind the RX8 rotor apex seal groove to the same depth as the older rotors then use Tracy's or Hurley's 2mm spex seals in a peripheral ported Renesis. You should be also be able to use the lighter 8.7 lb RX8 rotors in the older engines if you get the rotating assembly balanced. Wish I had a RX8 rotor so I could measure the critical dimensions (but not bad enough to buy one!(grin)).

Ken Powell
Bryant, Arkansas
501-847-4721

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