Return-Path: Received: from core-moa005b.r1000.mail.aol.com (core-moa005.r1000.mail.aol.com [172.29.233.17]) by mtaomg-mb03.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 69E2CE000086 for ; Tue, 30 Jul 2013 13:36:12 -0400 (EDT) From: Lehanover@aol.com Full-name: Lehanover Message-ID: Date: Tue, 30 Jul 2013 13:36:12 -0400 (EDT) Subject: Re: [FlyRotary] Re: : Misfire To: Lehanover@aol.com MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_a15a3.173af8f9.3f29538c_boundary" X-Mailer: AOL 9.0 VR sub 5203 X-Originating-IP: [184.57.119.231] x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1375205772; bh=RNYAqHpnci5vQy7res8DEJsm7wKhTJRY59Zwl3UjDr0=; h=From:To:Subject:Message-ID:Date:MIME-Version:Content-Type; b=BB5KBa53373HyJkF2n8+foznMC8qPQtbVPRzDMhw6kBuUVfHZ+zOADXXPXPgPWPv4 EZE5j6fzpmDoaYagc2Yz94GTUeukqZUmu/fLuBTRMnpwzpNa60TAePjLcVOwtDAHfC oyYIbrJG/22Kq12JJjm21O9Msrx3fYeNKQf1JwZ0= X-AOL-SCOLL-SCORE: 0:2:446623296:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d294a51f7f98c5bd0 --part1_a15a3.173af8f9.3f29538c_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit The rotary has three features that make for a poor idle compared to a piston engine. Heat of compression. The rise in chamber temperature caused by compressing the fuel/air mixture. The rotary has poor heat of compression because of the large surface are of the chamber, and much of the chamber surface is cooled. Low heat of compression allows fuel droplets to condense on the chamber surfaces and the engine sees this as a mixture that is too lean to light. Compression leakage: The rotor face has many end gaps through which it leaks compression. For example, on NA rotaries I gap the side seal to corner seal at zero. So long as the combination of two side seals and the joining corner seal pop back up when depressed and released, that is sufficient. The zero gap will become a measurable gap shortly after break in. Overly wide end gaps lead to leakage of compression, and that leads --part1_a15a3.173af8f9.3f29538c_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

The rotary has three features that make for a poor idle comp= ared=20 to a piston engine.

Heat of compression. The rise in chamber temperature caused by compres= sing=20 the fuel/air mixture.

The rotary has poor heat of compression because of the large surface a= re of=20 the chamber, and much of the chamber surface is cooled. Low heat of compres= sion=20 allows fuel droplets to condense on the chamber surfaces and the engine see= s=20 this as a mixture that is too lean to light.

Compression leakage: The rotor face has many end gaps through which it= =20 leaks compression. For example,

on NA rotaries I gap the side seal to corner seal at zero. So long as = the=20 combination of two side seals and the joining corner seal pop back up when= =20 depressed and released, that is sufficient. The zero gap will become a=20 measurable gap shortly after break in. Overly wide end gaps lead to leakage= of=20 compression, and that leads

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