Message-ID: <01C441C7.A299C3E0@nwhn-sh18-port207.snet.net>
From: Jim Maher <DELTAFLYER@prodigy.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Two problems solved, 2 more pop up...
Date: Mon, 24 May 2004 19:45:13 -0400
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Dave,
Here is the fix for the RMI Tach problem that you are having.
1. Remove R82 (61.9Kohm resistor) on the CPU board. It is located in the =
lower right hand corner of the pc board
2. Replace with a resistor of about 34K-36K.=20
I used a 34.8K as it allowed me to operate up to 7500RPM (as advertised) =
.
The exact value is not critical as this is in an RC circuit that =
controls a one shot that filters the tach signal.
It works by preventing any ringing or spurious pulses from getting =
through.
You should be able to source the resistor from Radio Shak or any other =
electronics outlet.
Another option which was suggested by Ron Mowrer at RMI is to leave the =
existing resistor in and solder another resistor of about 86.6K in =
parallel with R82, This has the same effect of putting a 36K resistor =
without having to remove the existing one.
Either way it will solve your RMI tach problem.
Jim Maher


-----Original Message-----
From:	DaveLeonard [SMTP:daveleonard@cox.net]
Sent:	Sunday, May 23, 2004 10:03 PM
To:	Rotary motors in aircraft
Subject:	[FlyRotary] Re: Two problems solved, 2 more pop up...

Jim, that is awesome.  You are the one who clued me in to the fact that =
the
tach may not be reading right.  I even tried changing the setting to =
"two
pulses per rev" to see if it might just work with half the value showing =
on
the display.  No good, the half-values still maxed out at 2300 RPM.
Anxiously awaiting your fix, as I really don't want to install a =
separate
tach.

Thanks a billion.

Dave

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Jim Maher
Sent: Sunday, May 23, 2004 3:08 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Two problems solved, 2 more pop up...


Dave,
The RMI Tach circuit has a glitch filter which will prevent RPM readings
above about 4500.
On mine I changed a resistor value to allow readings up to 7500 RPM.
It is a simple change.
I don't have the schematic here at home so I cannot tell you how to fix =
it
until I go to work and review what I did.
I will send you the fix tomorrow.
Jim Maher


-----Original Message-----
From:	DaveLeonard [SMTP:daveleonard@cox.net]
Sent:	Sunday, May 23, 2004 2:15 AM
To:	Rotary motors in aircraft
Subject:	[FlyRotary] Two problems solved, 2 more pop up...

Snip

New Problem: RMI tach no good.  According to my RMI engine monitor I =
have
about 4300 RPM at 24 MAP.  At 29 MAP I still only have about 4500 RPM =
and at
35 MAP I am still at 4500 RPM static.  I dont buy it because it sure =
sounds
different (faster).  So I have to install an accessory Tachometer....

Snip


>>  Homepage:  http://www.flyrotary.com/
>>  Archive:   http://lancaironline.net/lists/flyrotary/List.html

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