Hi Paul/Gang;
I'm back and victorious.....Replaced practically most of the staff
involved
in the project code named by me, "PM NIGHTMARE" due to the very, very
long,
stressful hours spent from dawn to dawn, not even time to take normal
baths
or shave. (Told my staff over a sandwich about the "Skunk Works" crowd
but
they didn't believe me)....
Anyways, I have some respite for now......Vance I haven't abandoned you,
will
be in touch again soon, unfortunately everything has gone to the back
burners
for the time being.
Okay guys, let's talk Bellhousing......The attachments cover and explain
the
various scenarios in which the BH can serve multi roles.
-1 (TOP) Illustrates the BASIC BH casting already machined. This is the
way
the Builders will be getting it REGARDLESS of your individual preference
on
Starter location (3, 9 or 6 o'clock position).....Note the area between
the
two (2) lower Ribs, this will be additionally built-up on the INSIDE 2mm
(.079") thk, from just outboard of the left Rib to just outboard of the
right
Rib (See white dashed lines) making this area 7mm (.276") thick.......A
2mm
(.079") deep Pocket (kidney shaped area) is milled on the surface
between the
2 ribs, reducing the wall back to 5mm (.197")..This machined surface is
there
primarily for the benefit of the 6 o'clock Starter builders, however for
the
3 or 9 o"clock builders it can be employed to mount/brace anything they
want
(Great place for a Mini PSRU reservoir etc)
The next thing to note is the rather large pyramid of extra 6mm (.236")
thick
Flange mat'l. This of course follows the same rule as the machined
surface
referenced above.
-1 (BOT) With the pyramid portion of the Flange cut-off by the Builder
the
Bellhousing is shown back to its original size and weight for the 3 or 6
o'clock Starter positions....Shown is the Manual Starter same as Tracy
uses
(Solenoid same side as the drive gear), showing where the solenoid
actually
falls based on the R&D I performed, more on this later on........As
discussed
previously, the 9 o'clock position can be utilized by eliminating the
use of
the 8:30 Bellhousing mounting hole which falls right smack in the
Starter
snout's clearance hole. IMO, this bolt for our application (Smooth
torque
transition) is not necessary and 5 is plenty good.
-2 (TOP) Represents the finished machined Bellhousing with the
triangular
material appropriately contoured together with the Starter's clearance
hole
machined in.....
-2 (BOT) okay here's the slight kicker, I found that the Starter of
choice
for this mounting position is the Automatic/Turbo model (Solenoid
OPPOSITE
side of the drive gear) for obvious reasons. Another valid contender is
the
Subaru Starter for its smaller footprint, I personally prefer the Mazda
due
to the differential in drive gear size, robustness and casting
quality...
The rest is basically self explanatory:
Starting with the 5mm (3/16") Starter load distributing mounting plate
(Blue)
which is nested and bolted in the BH's pocket, note that the Plate is
3mm
(.118") above the surface of the BH this is to compensate for the longer
automatic Starter's snout. The Starter's right hand mounting hole with a
round Spacer (Yellow), between the plate and the BH Flange is not shown
on
the side view as it's a vertical cross sectional view, and last but not
least, the MMs showing 2 different scenarios. Also note the BH's 8:30
mounting bolt spacer also shown in yellow and on the side view.
-3 (TOP & BOT) This one is for the Jockeys who have or are
buildinging "Skinny Pointed Nose" Birds, but especially for SCOTT
GETTINGS
who was the person who made me aware of the "Pushers" need for a 6
o'clock
mounting position as well as width restrictions, hence the need for a
narrower Front MM.
Most of this again, is self explanatory and consists of the same
components
as -2 with the exception of size and contour. the big different lies in
the
introduction of the Front MM. A word of caution here is in order as Paul
will
attest...While the mounts are quite capable of taking the high G
vertical
loads their narrow 140mm (5.5") center to center span makes them
torsionally
and laterally unstable therefore an appropriate wider span rear mounts
are a
MUST....Don't even think about using a SINGLE point Rear MM.
This should be enough to energize the old noggin and open up some roads
of
creativity.
YIPPEEEE!!!!, I think I'm done, and hope I didn't forget anything.
Energetic Georgie is NEXT in line with the Pattern which he'll probably
do
in one day ;) RIGHT George???!!!!!!
Paul/George.....CAD files to follow after a little clean-up.
GLAD & HAPPY TO BE BACK HOME & ACRE
Butch
Hey Butch!!
What happened to the 11 0'clock starter position ?
Pauls going to need it for his new aircraft design.
George (down under)
No I do not. My new aircraft design can use the starter in any position.
In all seriousness why would you need the starter at 11 o'clock?
Isn't 9 o'clock OK as Butch has it.
Paul Lamar
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