Today's Message Index:
----------------------
1. 06:47 AM - MGL digital tach on an M-14 (Walt Murphy)
2. 08:38 AM - Re: MGL digital tach on an M-14 (Robin Hou)
3. 10:18 AM - Re: MGL digital tach on an M-14 (Gill Gutierrez)
4. 08:05 PM - Re: MGL digital tach on an M-14 (Walter Lannon)
Message 1
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| Subject: | MGL digital tach on an M-14 |
Does anyone have any experience in installing an MGL digital
tach/manifold press gauge in an aircraft with an M-14?
The installer added resistors and trimmed the instrument but it's still
not correct...close but maybe 150 RPM off compared to a strobe tach on
the prop.
Any info on the correct resistor or ?? Would be most helpful
thanks,
Walt Murphy
Reno
Message 2
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| Subject: | Re: MGL digital tach on an M-14 |
No experience with MGL, but my GRT EIS connected to mag switch on a Huosai works
great. Strobe each on your prop measures prop rpm. Digital tach connected to
mags measures engine rpm. You need to account for gear reduction to verify both
measurements.
Message 3
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| Subject: | MGL digital tach on an M-14 |
I use their tach and it is accurate. It could be that it needs to be
programmed for the correct pulse count. The guys at MGL are always very
helpful.
Gill
-----Original Message-----
From: owner-yak-list-server@matronics.com
[mailto:owner-yak-list-server@matronics.com] On Behalf Of Walt Murphy
Sent: Wednesday, April 03, 2013 6:45 AM
Subject: Yak-List: MGL digital tach on an M-14
Does anyone have any experience in installing an MGL digital tach/manifold
press gauge in an aircraft with an M-14?
The installer added resistors and trimmed the instrument but it's still not
correct...close but maybe 150 RPM off compared to a strobe tach on the prop.
Any info on the correct resistor or ?? Would be most helpful
thanks,
Walt Murphy
Reno
Message 4
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| Subject: | Re: MGL digital tach on an M-14 |
Walt;
As Robin has noted you need to take the gear ratio into account when
comparing engine to prop RPM.
For the M14P the gear ratio is 0.658. For the Huosai it is 0.787. At
2900 engine RPM the M14 prop is turning at 1908 RPM. At 2350 engine RPM the
Huosai prop is turning at 1850 RPM.
Hope that helps.
Walt
-----Original Message-----
From: Walt Murphy
Sent: Wednesday, April 03, 2013 6:44 AM
Subject: Yak-List: MGL digital tach on an M-14
Does anyone have any experience in installing an MGL digital
tach/manifold press gauge in an aircraft with an M-14?
The installer added resistors and trimmed the instrument but it's still
not correct...close but maybe 150 RPM off compared to a strobe tach on
the prop.
Any info on the correct resistor or ?? Would be most helpful
thanks,
Walt Murphy
Reno
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