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)