Butch,
Thanks for including pushers in your current design. The 6:00 position
addition looks ideal for the starter/mount requirements of certain types of
planes. I'm using a 12A front cover, which will allow a wide mount on the
other end of my engine, thus making the narrow mounts near a 6:00 starter
on your bellhousing not a problem.
******You're welcome Scott. All of us are in the same boat here, we give when
we are able to, and we grasp what we're able to use, hopefully wisely. Like
I've said numerous times before, "There's a lot of talent in this Newsletter"
willing to go the extra mile plus when it's needed, and all one has to do is
just ask :)
I'll be very interested to hear about the availability of this housing.
Although I've been following this thread, I'm not sure whether you plan on
using a custom planetary gearbox and flange, or just allowing Tracy's unit
to be bolted on.
Scott Gettings
******It's designed for both Tracy's PSRU and George's, you must have missed
the first posting on this, here it is again it's all here, including the 3
attachments....Read it carefully :)
Butch
*****************************************************************************
From: AVIONAGUJA@att.net
To: rotaryeng@earthlink.net (ACRE NL)
Subject: "UNIVERSAL" Bellhousing
Date: Tue, 28 Oct 2003 23:29:31 +0000
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
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 Tracy's PSRU Xsection view shows the minor conversion necessary to adapt
Tracy's PSRU to the Bellhousing without Tracy's WARRANTY being
jeopardized...The mounting flange (Purple), is actually rough Bandsawed out
of the ORIGINAL PSRU 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
ATTACHMENT 1: Front-Side views.gif (image/gif)
ATTACHMENT 2: RD Psru Xsection view.gif (image/gif)
ATTACHMENT 3: George's Psru Xsection view.gif (image/gif)
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