Return-Path: Received: from fed1mtao02.cox.net ([68.6.19.243] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2537291 for flyrotary@lancaironline.net; Fri, 22 Aug 2003 00:44:15 -0400 Received: from Leonards ([68.111.228.182]) by fed1mtao02.cox.net (InterMail vM.5.01.06.04 201-253-122-130-104-20030726) with ESMTP id <20030822044359.USXE15700.fed1mtao02.cox.net@Leonards> for ; Fri, 22 Aug 2003 00:43:59 -0400 From: "David Leonard" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: tachs Date: Thu, 21 Aug 2003 21:44:00 -0700 Message-ID: <001a01c36868$01521570$b6e46f44@Leonards> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_001B_01C3682D.54F33D70" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.3416 In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_001B_01C3682D.54F33D70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit I think the 3 rotor won't be any different. My guess is that the CAS still only sends 2 signals per rev, and each coil will still only send 1 signal per rev. David Leonard The Rotary Roster: http://members.aol.com/_ht_a/rotaryroster/index.html So, if the 3-rotor fires every 120 degrees of crank rotation, can I just take an off-the-shelf unit and set it to 6 cylinder mode and be good to go? Sounds too easy! Mark Steitle A 3 rotor will give you 3 pulses per rev, so a standard 6 cyl tach will work if you can use the LS-1 coil trigger signal. I put a scope on the LS-1 coil trigger, and measured 4.04 VPP for the square wave. So far, no tach I've tried will work with this, but if Todd has one that will work with less than a volt, anything's possible. If you're planning to use the tach output, you'll still need a divider. BTW, I bought one of the BIG round tachs that I mentioned yesterday. I'll hook it up tomorrow to see if I can at least verify the Tiny Tach reading. I'll try to find a place for the new tach in the plane, but I'm running out of velcro to stick any other temporary gauges :-) Rusty (Large print so John can read it ) ------=_NextPart_000_001B_01C3682D.54F33D70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

I think the 3 rotor won’t be = any different.  My guess is that the CAS still only sends 2 signals per = rev, and each coil will still only send 1 signal per rev.  =

 

David Leonard

The Rotary = Roster:

http://memb= ers.aol.com/_ht_a/rotaryroster/index.html

 

So, if the 3-rotor fires every 120 degrees of crank rotation, = can I just take an off-the-shelf unit and set it to 6 cylinder mode and be = good to go?  Sounds too easy! 

Mark Steitle 

 

A 3 rotor will give you 3 pulses = per rev, so a standard 6 cyl tach will work if you can use the LS-1 coil trigger signal.  I put a scope on the LS-1 coil trigger, and measured = 4.04 VPP for the square wave.  So far, no tach I've tried will work with = this, but if Todd has one that will work with less than a volt, anything's possible. 

 

If you're planning to use the tach = output, you'll still need a divider. 

 

BTW, I bought one of the BIG round = tachs that I mentioned yesterday.  I'll hook it up tomorrow to see if I = can at least verify the Tiny Tach reading.  I'll try to find a place for = the new tach in the plane, but I'm running out of velcro to stick any other = temporary gauges :-)

 

Rusty (Large print so John can read = it <g>)

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