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From: "George Lendich" <lendich@optusnet.com.au>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-752954@logan.com>
Subject: Re: [FlyRotary] Re: PSRU - gear sets
Date: Tue, 22 Feb 2005 08:42:09 +1000
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Ernest,
Please explain needle roller bearings under the planets.
I was in the middle of explaining about NRB but realised you may have ment
something else, other than what I'd thought.
George ( down under)

> Ed Anderson wrote:
>
> >Ernest, I think you might be referring to the time Tracy received some
drive
> >shafts which had not been manufactured correctly.  Wasn't an
incompatibility
> >problem it was failure in manufacturing and quality control.
> >
> >Ed A
> >
> >
> >
>
> Yeah, that was it.  He ended up having to ship a bunch of units back,
> right?  I just vaguely remember it, with the basic lessons being to
> carefully check my gearset with a strong backlight before trusting life
> and limb and that all gearset are NOT created equal.
>
> I remember the lesson more clearly than what taught it, which led to my
> reluctance to swap gears.  Now that I realize that I can inspect the
> switch in the store...No problem.  I'll swap out for the 6-planet set
> with the steel carrier next week.  My investigation has reveal what
> Tracy was saying earlier, though.  I don't yet know if it is the front
> or rear gear set, buy there are a lot of variations that actually have
> different reduction rates.  But again, I won't leave the store without
> something that works properly, even if it is what I have.
>
> One question I still have, though.  I've read that the major wear factor
> on a gear set is the number of torque reversals.  Wouldn't a 6-planet
> set induce twice the number of reversals as the 3-planet?  And how much
> difference will it make if you're using the same sun and ring gears?
>
> Well, two questions.  Some of the racing sites are advertising planet
> sets with needle bearings under the planets.  Claims to reduce rolling
> resistance and increase torque.  Smells of snake oil to me, but since
> I'm switching out anyway, is there any merit to this?
>
> Ernest (you are in a maze of reduction gears...all slightly different)
>
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