X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.120] verified) by logan.com (CommuniGate Pro SMTP 5.2.2) with ESMTP id 2879870 for flyrotary@lancaironline.net; Thu, 01 May 2008 08:11:25 -0400 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.120; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([75.191.186.236]) by cdptpa-omta04.mail.rr.com with SMTP id <20080501121046.RYVJ2106.cdptpa-omta04.mail.rr.com@edward2> for ; Thu, 1 May 2008 12:10:46 +0000 Message-ID: <002001c8ab84$676e8c30$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Dual plugs Date: Thu, 1 May 2008 08:10:53 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001D_01C8AB62.E02142C0" 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 This is a multi-part message in MIME format. ------=_NextPart_000_001D_01C8AB62.E02142C0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Scott, Changing the timing difference between leading and trailing = firing as Tracy has done with his EC2 ignition scheme is all that is = really needed to ensure no significant power loss in event of losing one = or the other ignition sources(now he tells me {:>)). =20 When I switch between both and leading or trailing only during my = pre-flight check (controller B) - I notice a very slight change in = engine tone - but no difference is discernable on my rpm gauge. Same in = flight, I do notice the EGT does change when using only the Trailing = plug - but rpm stays the same. Lynn would be the one to address what - if any - effects opening up = the trailing spark plug hole would have. I must admit I would be a bit = concerned about flash over into the next rotor face as its coming up on = its compression stroke, but that is purely speculation on my part - = don't know if it even could happen..=20 Ed ----- Original Message -----=20 From: SHIPCHIEF@aol.com=20 To: Rotary motors in aircraft=20 Sent: Wednesday, April 30, 2008 10:42 PM Subject: [FlyRotary] Re: Dual plugs My engine was built by Hayes Rotary in Washington. He has retired now, = but he opened up my trailing plug holes for better spark plug = effectiveness in case of a leading plug failure. He thought it would be = safe for an aircraft even tho a small bit of compression might be lost. I have not flown my engine yet, but in the initial ground run while = testing the B controller, I performed the coil cut out test and they = seemed about equal, that is a slight loss of RPM. Sorry, I was too = excited to have my engine running for the first time to record what the = drop was. But now reading that the drop is negligable without increasing = the size of the hole for the trailing plug, I would nopt have had it = done. Scott ************** Need a new ride? Check out the largest site for U.S. used car listings = at AOL Autos. (http://autos.aol.com/used?NCID=3Daolcmp00300000002851) ------=_NextPart_000_001D_01C8AB62.E02142C0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Scott, Changing the timing difference = between=20 leading and trailing firing as Tracy has done with his EC2 ignition = scheme is=20 all that is really needed to ensure no significant power loss in = event of=20 losing one or the other ignition sources(now he tells me {:>)). =

When I switch between both and leading = or=20 trailing only during my pre-flight check (controller B) - I notice = a very=20 slight change in engine tone - but no difference is discernable on my = rpm=20 gauge. Same in flight, I do notice the EGT does change when using = only the=20 Trailing plug - but rpm stays the same.

Lynn would be the one to address what - = if=20 any - effects opening up the trailing spark plug hole would = have. I=20 must admit I would be a bit concerned about flash over into the next = rotor face=20 as its coming up on its compression stroke, but that is purely = speculation on my=20 part - don't know if it even could happen..

----- Original Message -----

From:=20 SHIPCHIEF@aol.com

To: Rotary motors in = aircraft

Sent: Wednesday, April 30, 2008 = 10:42=20 PM

Subject: [FlyRotary] Re: Dual = plugs

My engine was built by Hayes Rotary = in=20 Washington. He has retired now, but he opened up my trailing plug = holes for=20 better spark plug effectiveness in case of a leading plug failure. He = thought=20 it would be safe for an aircraft even tho a small bit of compression = might be=20 lost.
I have not flown my engine yet, but in the initial ground run = while=20 testing the B controller, I performed the coil cut out test and = they=20 seemed about equal, that is a slight loss of RPM. Sorry, I was too = excited to=20 have my engine running for the first time to record what the drop was. = But now=20 reading that the drop is negligable without increasing the size of the = hole=20 for the trailing plug, I would nopt have had it=20 done.
Scott

**************
Need a new ride? = Check out=20 the largest site for U.S. used car listings at AOL=20 Autos.
(http://autos.aol.com/used?NCID=3Daolcmp00300000002851)=20 ------=_NextPart_000_001D_01C8AB62.E02142C0--