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Ernest
I agree with Kelly on this. Quite aside from any
structural considerations, in looking at Tracy's exploded view of the RD
assembly, it appears that you would be moving the whole main gear housing
assembly 1/4 inch closer to the eccentric shaft and trying to
force the input shaft/sun gear 1/4 inch deeper into the planetary
gears. From examination of my uninstalled RD-1B, I believe that all shaft
lengths, bearings, thrust bearings, clearances,etc, are carefully based on
use of the 1/2 inch plate, and it would be impossible to use anything
thinner.
Dean Van Winkle
RV-9A Fuselage/Finish '89 13B
NA, RD-1B, EC2, EM2
----- Original Message -----
Sent: Wednesday, June 22, 2005 1:08
PM
Subject: [FlyRotary] Re: PSRU adapter
plate
Ernest,
Without any engineering expertise I would not even
consider using
1/4" aluminum plate no matter what alloy !!FWIW
--
Kelly Troyer
Dyke
Delta/13B/RD1C/EC2
--------------
Original message from Ernest Christley <echristley@nc.rr.com>:
--------------
> My bellhousing is to heavy. Dave McC is
considering buying it for his
> Europa, so I've been researching what
it would take to replace it. I
> think Tracy' s adapter plate is a
very elegant solution for the
> homebuilder (ie, those of use without
a foundry).
>
> His adapter plate uses 1/2" 6061. I've been
considering at 7075
> aluminum. It has about twice the cost but also
twice the yield
> strength. If I could use 1/4" plate instead of the
1/2", the cost would
> be comparable, but I would have the very large
benefit of saving
> something on the order of 4lbs in a very weight
sensitive area. I don't
> have the expertise to run the numbers with
confidence. All I can do is
> a static analysis following the
directions outlined on PL's website,
> just like I did for the engine
mount.
>
> Any advise of stuff to look for that might no be so
obvious and not show
> up in a static analysis? (the three axis and
torsional forces are obvious)
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