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 2534735 for flyrotary@lancaironline.net; Wed, 20 Aug 2003 08:52:55 -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 <20030820125254.CTKP94.imf24aec.mail.bellsouth.net@rad> for ; Wed, 20 Aug 2003 08:52:54 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] tachs Date: Wed, 20 Aug 2003 07:52:57 -0500 Message-ID: <015401c36719$fa9d4500$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0155_01C366F0.11C73D00" 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_0155_01C366F0.11C73D00 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Yes, Please, Todd. I have the Tiny Tach, but it is true to it's name. = I'd rather install a 3 inch circular one.=20 Rusty said I'd need to divide by 12 to use the EC2 output. Right? How much?=20 =20 3 inch tach!!! John, I think what you really need is some glasses :-)=20 =20 For the record, since the tiny tach expects one pulses per revolution, = you'd have to divide by 12 to get the proper reading if you hooked it up to = the tach output. I don't think that would be the best way to hook a tiny = tach up though. =20 =20 Most normal tachs come with a switch, or some other method of setting = the number of cylinders, and the choice is usually 4,6, or 8. Since 4 cycle engines fire half of their cylinders on every rotation, the tach expects = to see half the number of cylinders pre rev. If you use the tach output of = the EC-2 for a normal, off the shelf tach, you'll have to divide as follows: =20 4 cylinder setting, 2 pulses per rev, divide by 6 6 cylinder setting, 3 pulses per rev, divide by 4 8 cylinder setting, 4 pulses per rev, divide by 3 =20 Now that I think about it, what the heck does that Geo 3 cylinder engine = do :-) =20 Rusty (it's too early) =20 =20 =20 ------=_NextPart_000_0155_01C366F0.11C73D00 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
Yes, = Please, Todd. I=20 have the Tiny Tach, but it is true to it's name. I'd rather install a 3 = inch=20 circular one.
Rusty = said I'd need=20 to divide by 12 to use the EC2 output. Right?
How much? 
 
3 inch tach!!! = John, I think=20 what you really need is some glasses=20 :-) 
 
For the = record, since the=20 tiny tach expects one pulses per revolution, you'd have to divide by 12 = to get=20 the proper reading if you hooked it up to the tach output.  I don't = think=20 that would be the best way to hook a tiny tach up=20 though.  
 
Most normal tachs come with a = switch, or=20 some other method of setting the number of cylinders, and the choice is = usually=20 4,6, or 8.  Since 4 cycle engines fire half of their cylinders on = every=20 rotation, the tach expects to see half the number of cylinders pre=20 rev.  If you use the tach output of the EC-2 for a normal, off = the=20 shelf tach, you'll have to divide as = follows:
 
4 cylinder setting, 2 pulses = per rev,=20 divide by 6
6 cylinder setting, 3 pulses = per rev,=20 divide by 4
8 cylinder setting, 4 pulses = per rev,=20 divide by 3
 
Now that I think about it, = what the heck=20 does that Geo 3 cylinder engine do :-)
 
Rusty (it's too=20 early)
  =
 
 
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