My experience would show as with Mark that the Rotax RPM gauges are not to
be trusted. My original was some 200rpm under reading when new. Europa re
calibrated it but some 2 years later it had gone way out again. I rely on
the digital readout from my EIS from Grand Rapids.
Pete Jeffers
-----Original Message-----
From: owner-europa-list-server@matronics.com
[mailto:owner-europa-list-server@matronics.com] On Behalf Of Mark Burton
Sent: 13 November 2012 21:02
Subject: Europa-List: Re: rotax Tacho verses digital
Hi,
The Rotax tacho really cannot be trusted. Many years ago, one of my
customers told me that when he fitted a CSC-1/P constant speed controller,
it showed 600 RPM more than the Rotax tacho! So when the customer thought he
was using around 5700 RPM on takeoff he had actually been using 6300 every
time. Somewhat ironic that installing the CS controller actually reduced his
takeoff performance by about 10% (but hopefully prolonged the life of his
912S).
The Rotax tacho has a little pot in it you can twiddle to adjust the
displayed RPM but it's impossible to get at when the thing is in situ. Also,
if memory serves me right, Rotax decreed that it should be calibrated
something like every 50 hours!
Cheers,
Mark
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=387781#387781
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