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<... The resonant frequency for his drive is down low in RPM. So the rubber
bushing actually help push it lower ...>
OK. I thought Tracy's was high. So Tracy's can rattle some at low idle so
raise idle rpm out of that range, rubber bushings would (presumably) drive
Tracy's all the way below idle range, or at least "soften the blow" when it did
rattle.
Am I getting any warmer? ... Jim S.
Ed Anderson wrote:
Actually, Jim
After looking at the pros and cons of both approaches, Tracy went with
the looser tolerance route and that is why you get a 42 lb gear box rather
than a 60 lb gearbox. The resonant frequency for his drive is down low in
RPM. So the rubber bushing actually help push it lower. An example of the
other approach is PowerSports Spur drive gear box. They went to tighter
tolerances (more precision machining required) and stiffer components which
raised the resonant freq above our normal operating range. Both approaches
work. PowerSport had their own CNC machining company so its not surprising
they took that route. Tracy had considerably less machining capability -
but more smarts {:>) IMHO
Ed Anderson
>> Homepage: http://www.flyrotary.com/
>> Archive: http://lancaironline.net/lists/flyrotary/List.html
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