I've heard the same thing about the Rotax tachs. Fortunately, the
Airmaster prop controller takes its RPM reading from the prop and
constrains the engine according to that reading. Or so I've been told.
So far (at 150hrs) the tach coincides with the factory set numbers
(5700, 5400, 5000) set up in the prop controller. I've also heard that
improper adjustment of the ignition/tach pickups can cause errant tach
readings...
Jeff - N55XS
150 hrs, and now on autopilot... :)
BEBERRY@aol.com wrote:
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> In a message dated 23/03/2006 07:00:29 GMT Standard Time,
> william@wrmills.plus.com writes:
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> Hi Patrick and all,
> May I suggest you do not rely on the accuracy of the Rotax tachometer.
> After 200 hours, mine was found to be under reading by 300 rpm, which meant
> I had been taking off regularly at 6,100 without knowing! Fortunately, I
> never cruised at 5,500. Apparently it is not unusual for Rotax tachos to be
> out of calibration to that extent.
> Best wishes,
> William
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> Thanks for that William. Patrick
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