X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp0.av-mx.com ([137.118.16.56] verified) by logan.com (CommuniGate Pro SMTP 5.4.2) with ESMTP id 5197721 for flyrotary@lancaironline.net; Sat, 12 Nov 2011 21:39:13 -0500 Received-SPF: pass receiver=logan.com; client-ip=137.118.16.56; envelope-from=res12@fairpoint.net Received: from main (dflo-67-158-146-138.gtcom.net [67.158.146.138]) (Authenticated sender: res12@fairpoint.net) by smtp0.av-mx.com (Postfix) with ESMTP id 93B791C05B7 for ; Sat, 12 Nov 2011 21:38:36 -0500 (EST) Message-ID: <9A6498D9472447ACAE8C876831B84D06@main> From: "Richard Sohn" To: "FlyROTARY" Subject: Re: [FlyRotary] Re: Am I Alone?? Date: Sat, 12 Nov 2011 20:39:29 -0600 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_002E_01CCA17B.2CD270A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5931 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 This is a multi-part message in MIME format. ------=_NextPart_000_002E_01CCA17B.2CD270A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I am desperately trying to get the single rotor running in the airplane. = The engine on the test stand is just humming away, and when I tried the = one in the airplane a couple of weeks ago it did not do anything.=20 No ignition!!! cranking too slow??? starter cable too long??? CAS = signal too weak??? =20 The ignition fired when I took the plugs out of the rotor housing, but = not when they were in the housing. The crank speed difference is 240 vs = 320 RPM. The engine on the test stand is already so free that it does = crank about 360RPM. Solution? Making a larger diameter trigger wheel to = make up for the slower crank speed. Turned out to make no difference. = What is going on?????.=20 My ignition system is a MSD Street Fire unit. At this point, I decided = to have a closer look at the trigger characteristics of this unit. After = running it on the bench with all sorts of triggers, it turns out to = require a minimum pulse repetition rate at which it is firing no matter = what voltage or wave shape of the trigger signal. On top of that, a = build in trigger indicator light works at much slower trigger signal the = coil actually fires, creating a deception when testing.=20 All that seem to be not a malfunction of one unit because I have two = units doing exactly the same thing.=20 Before I found out what is going on, I contacted MSD by phone and was = told to hook it up correctly, and if it does not fire send it back to = them. Later I sent in some more questions by email which were never = answered. Final solution! No CDY. Using two individual coils with a TSI igniter = each. No more low speed issues.=20 Installation on the test stand is complete, and will be tested in the = next two days. If nothing bad happens, installation in the airplane will = be competed in a couple of days. I hope this is not to confusing.=20 Richard Sohn N2071U www.fairpoint.net/~res12/home.html ------=_NextPart_000_002E_01CCA17B.2CD270A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
I am desperately trying to get the = single rotor=20 running in the airplane. The engine on the test stand is just = humming=20 away, and when I tried the one in the airplane a couple of weeks ago it = did not=20 do anything.
No ignition!!!  cranking too = slow??? =20 starter cable too long??? CAS signal too weak??? 
The ignition fired when I = took the=20 plugs out of the rotor housing, but not when they were in the = housing. The=20 crank speed difference is 240 vs 320 RPM. The engine on the test stand = is=20 already so free that it does crank about 360RPM. Solution? Making a = larger=20 diameter trigger wheel to make up for the slower crank speed. Turned out = to make=20 no difference. What is going on?????.
My ignition system is a MSD Street Fire = unit. At=20 this point, I decided to have a closer look at the trigger = characteristics of=20 this unit. After running it on the bench with all sorts of triggers, it = turns=20 out to require a  minimum pulse repetition rate at which it is = firing no=20 matter what voltage or wave shape of the trigger signal. On top of that, = a build=20 in trigger indicator light works at much slower trigger signal the=20 coil actually fires, creating a deception when = testing. 
All that seem to be not a malfunction = of one unit=20 because I have two units doing exactly the same thing.
Before I found out what is going on, I = contacted=20 MSD by phone and was told to hook it up correctly, and if it does not = fire send=20 it back to them. Later I sent in some more questions by email which were = never=20 answered.
 
Final solution! No CDY. Using two = individual coils=20 with a TSI igniter each. No more low speed issues.
 
Installation on the test stand is = complete, and=20 will be tested in the next two days. If nothing bad happens, = installation in the=20 airplane will be competed in a couple of days.
 
I hope this is not to confusing. =
 
Richard Sohn
N2071U
www.fairpoint.net/~res= 12/home.html
 
 
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