From: "David Leonard" <Daveleonard@cox.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Tach Divider
Date: Tue, 5 Aug 2003 22:18:21 -0700
Message-ID: <000701c35bda$27407640$f0000844@Leonards>
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Thanks, Jim.  I'm using the LS1 coils so I don't think that will work
for me.  Thanks for the input on the RMI.  Sounds like I may have some
issues to work out as well.

David Leonard
The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html

> -----Original Message-----
> From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On
> Behalf Of DELTAFLYER@prodigy.net
> Sent: Tuesday, August 05, 2003 12:25 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Tach Divider
> 
> David,
> Just recently resolved my RMI tach issues so I think I
> can provide some guidance. I drive the RMI tach from
> the yellow wire off the Mazda coils. This provides a
> 12volt 2ms duration pulse twice per revolution.
> Configure the RMI as for a 4 cylinder engine.
> Using a pulse generator on the bench I found that if
> the signal went below about 10volts the tach would
> stop working. The RMI tach only worked up to 4500RPM
> and then would read half the RPM's above 4500. This is
> due to a one-shot circuit that Ron has built in to
> suppress spurious glitches from getting through.
> Unfortunately it is set up with too low an R/C time
> constant for our use. However it can be fixed with a
> simple resistor change. If you would like more info on
> this fix feel free to contact me off line or contact
> Ron at RMI as I have recently.
> Jim Maher
> Dyke Delta/13B
> 
> --- Original Message ---
> From: "David Leonard" <Daveleonard@cox.net>
> To: "Rotary motors in aircraft"
> <flyrotary@lancaironline.net>
> Subject: [FlyRotary] Re: Tach Divider
> 
> >This brings up a good point that I have been meaning
> to ask - esp.
> >Tracy.  I wired my CAS the EC2 as instructed, but I
> also wired one of
> >the leads in parallel with the hall sensor on my
> Rocky Mountain Engine
> >Monitor.  Does anyone think that this will not work?
> I'm not really
> >sure how the hall sensor worked, but I figured the
> motion of the magnet
> >created a small voltage spike in the circ.  I figured
> the spike would be
> >big enough to trigger 2 voltage sensors (one in the
> EC2 and one in the
> >RMS Monitor) at the same time without causing any
> problem.  This will be
> >one of the things I look at if all does not work well
> at fist start, but
> >does anyone know for sure this will not work?
> >
> >
> >
> >Thanks,
> >
> >
> >
> >David Leonard
> >
> 
> 
> 
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