Return-Path: <13brv3@bellsouth.net> Received: from imf24aec.mail.bellsouth.net ([205.152.59.72] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2537124 for flyrotary@lancaironline.net; Thu, 21 Aug 2003 22:44:54 -0400 Received: from rad ([68.212.14.21]) by imf24aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030822024424.OCKZ25137.imf24aec.mail.bellsouth.net@rad> for ; Thu, 21 Aug 2003 22:44:24 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: tachs Date: Thu, 21 Aug 2003 21:44:24 -0500 Message-ID: <000001c36857$4c19ab60$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C3682D.6343A360" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C3682D.6343A360 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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! =20 Mark Steitle=20 =20 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. =20 =20 If you're planning to use the tach output, you'll still need a divider. = =20 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 :-) =20 Rusty (Large print so John can read it ) ------=_NextPart_000_0001_01C3682D.6343A360 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
So, if the 3-rotor fires every 120 degrees of crank rotation, can I = just=20 take an off-the-shelf unit and set it to 6 cylinder mode and be good to=20 go?  Sounds too easy! 

Mark Steitle 
 
A 3 rotor=20 will give you 3 pulses per rev, so a standard 6 cyl tach will work if = you can=20 use the LS-1 coil trigger signal.  I put a scope on the LS-1 = coil=20 trigger, and measured 4.04 VPP for the square wave.  So far, no = tach I've=20 tried will work with this, but if Todd has one that will work with less = than a=20 volt, anything's possible. 
 
If you're=20 planning to use the tach output, you'll still need a divider. =20
 
BTW, I bought=20 one of the BIG round tachs that I mentioned yesterday.  I'll hook = it up=20 tomorrow to see if I can at least verify the Tiny Tach reading.  = I'll try=20 to find a place for the new tach in the plane, but I'm running out of = velcro to=20 stick any other temporary gauges :-)
 
Rusty=20 (Large print so John can read it = <g>)
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