Moving On/Moving Forward, means: ......I will not let this very
Important and
Beneficial project to all, be buried again for the second time, so I'm
getting involved in the hard-core design aspects of it. I will soon be
submitting a layout which will consist of ideas and suggestions which
have
already been contributed by all of us plus a few new ones, together with
my
personal pondering on the subject which should please everybody a sort
of
WIN, WIN situation for all......So stay tuned......Just give me a few
days to
suck up some sea level air as I've just arrived from being on top of a
very
high mountain in a classified location for almost 2 weeks 8(
Butch
****************************************************************************
*
Hi Gang;
Per my above posting on September 27th, I must apologize for my
tardiness but
unfortunately it was due to two very good reasons, #2 first...I had to
go
back up to the Top of the mountain, (No Paul, not for inspiration but to
work
my butt off on something unrelated) :( ..#1 which took the longest, I
did not
realize this undertaking was going to be such a Pain in the A-S. 8-(
But the great news is that I was able to gather and throw all the valid
suggestions from Paul, George and ACRE into a pot, added a few new ones
of my
own together with some spicy ideas and voila, came up with a pretty
good "Sancocho" (Stew)......The best part is that everybody here can
WIN, if
they want to of course.
The attached .gifs show the dimensions in mm, so for the benefit of
those who
are metric system challenged, just multiply by .03937 in order to change
it
to the NUMERO UNO system in the world, (No fighting please) ;) BTW,
I've
always charged 15% more for Metric projects....Are you listening
Georgie? :-)
-The Front-Side views shown, is typical for both Tracy's RD and George's
PSRU...Shown is Tracy's Starter model mounting holes according to his
L/O
drawing, at 8:30 and 3:15 positions since it seems to be the acceptable
norm,
but I'm sure there are a lot of others out there that can be accomodated
as
well if not better...The hidden red line on the bottom represents the
Oil
Pan's sealing surface for the 13B...Views depict projection of 3 deg
draft
angle from the nose down to the Flange's outer diameter, (The reason why
some
of the lines appear to be doubled or wavy)...Bellhousing to Engine
mounting
holes (5 pls) will require light Spot Facing to clean the Bolt area and
to
remove most of the corner radius off the 7:00 oclock position
hole......The
sixth hole located (of all places), right smack in the center of the
8:30
Starter position, is not really necessary for our purposes, however for
the
sake of the Belt and Suspender individuals out there, I have a solution
(More
on this later)...The Tripod pads are there for the benefit of George's
PSRU,
which will be used on aerobatic a/c. For those of you who won't need
them or
are hard-up for weight savings, they can be Die Grinder removed with no
problem at all, or they can be used as mounting Bosses or for WYW..(FYI
Paul,
they make great Tooling holes for machining) ;)
The beauty of this Bellhousing is that it can be used with both Tracy's
RD
and George's PSRU.....They only differ on the rear vs front machining of
the
Psru's mounting nest (Under-cut), see Xsection views.
The RD PSRU Xsection view shows the minor conversion necessary to adapt
Tracy's RD to the Bellhousing without Tracy's WARRANTY being
jeopardized...The mounting flange (Purple), is actually rough Bandsawed
out
of the ORIGINAL RD mounting plate and the OD is Lathe turned to fit,
then the
outer mounting holes are L/O'd and drilled. That's it!!!
I'm going to stop right here and give you guys a chance to take all this
in,
as I've been living with this for a month.
As always I encourage all of you, especially the Lurkers, to speak your
piece
on this regardless that you won't be buying or using one, or even if you
may
think your suggestions/comments are stupid/silly....As I don't believe
Silence is Golden.
GUYS, I'm looking forward to your responses.
Thanks,
Butch
Looks great to me Butch.
Paul Lamar
Butch,
Very interesting indeed, somewhat different to my own concept, but certainly
the basics are similar to my latest solution especially in regard to the
side MM's, although I've got my starter at o'clock and have my MM smaller
i.e. 150mm (see attached photo)
Why have you cut the bottom-off the flange -doesn't it add stiffening and
stress transfer !!?
I've had a lot of trouble getting 2nd hand starters and have opted for a
Turbo starter as all Aussie imports are Turbo the non-turbo are impossible
to find.
I find the Turbo has a smaller foot-print and therefore takes up less room,
can you include that as an option !!?
I can send the details to you if you wish !
The stiffeners near the mounting bolts are very close- I found I had to move
them a bit in the prototype to allow sufficient room.
Why are the two at the extreme bottom sides - is there a strength issue
there, I thought 2 at the sides and one in the middle would be enough, that
way we could move them away from the mounting bolts,
giving a little more room to move.
I did consider having a starter location on the opposite side to allow
flexibility but couldn't get around the bolt hole being as you say "smack in
the middle of the starter" I would like to see your design to get around
that one. I gave myself a real headache trying to get around that problem.
I have been considering a deeper housing with more curve for additional
strength, or a ring shape extension like the Ross, but these designs would
have difficulty allowing Tracy's PSRU to be attached without modifications.
I can see your trying to make sure Tracy's unit fit without any
modifications.
Sorry to rush a response on this as I would like more time to "mull it
over", but I've got to go away for a week on Friday.
I would like to see other opinions on your suggestions (drawings) however.
I don't think this is an optimum solution but may be the best for something
universal.
I would like to hear something from Tracy on it unless he is 'dead against
it'.
I'm not interested in trying for a universal design if some of the main
players are against it, I'd rather just do my own thing .
Just give me some more time to consider any possible problems OK!!
George
The AirCraft Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/
Copyright 1998-2003 All world wide rights reserved.
