Paul and Georges Almost done before assembly. I do have the end
   shaft to be treaded 22mmX 1.5 for the safety nut and groove one one
   side to lock it . Then treated and annealed both shaft at Rockwell
   60. I will try to go at Sun&Fun this Saturday and comeback Sunday.
   Few photos for your interest. JEAN PRUDHOMME Looking real Jean. What
   does it weigh so far? I won't be at Sun & Fun this year. Too much
   patent work. Filing world wide. Paul Lamar Jean I am Pascal from
   France searching for a PSRU. Question: where did you find the bell
   housing which seems to be die casting made? And where did you get all
   these parts? Would be very interested to purchase a full set as you
   show in your photos. Since Tracy Crook retired, I really don’t where
   to find a planetary psru. If you can help, that would be great. I'm
   looking for 2.71 - 2.85 ratio. Thanks Best regards Pascal

   Jean

   No Help? Is it a secret where you got your parts?

   Regards Pascal

   The bell housing is stock Mazda. The casting on the front is a sprint
   car quick change rear end.

   Paul Lamar



   Thank you Paul I'll try to figure out on which trade mark car it is
   used and try to locate in Europe. Pascal



I don't think they have sprint car racing in Europe. There is a whole
industry here in the US dedicated to small oval tack racing on dirt
and pavement. The power is up to 800 HP and the weight is 1300 pounds
or less. There are literately 100's of small oval race tracks around
the US.

It is a reflection of our disposable income as is private aviation
:-)

Also so called live rear axles are not common in cars in Europe.
They are disappearing in the US as well and being replaced by front
drive independent suspension.

Paul Lamar




Paul Could send me your casting dimension I am working also with
needle bearing but I can use the same housing and I am wondering if
yours can be use. The needle bearing I intend to use is the B-3612
eBAY Torrington they are at $19.40 EACH


JEAN PRUDHOMME


We don't have a casting. I suggest making the housing out of thick
wall aluminium tubing.

Read over this stuff. I suggest cutting the splines for the 2.85:1
planet carrier on the end of this McMaster shaft. It is hard so you
may have to send it out ans have it normalized. After you cut the
splines turn it down to 2.26 OD. Then have it hardened and ground to
  2.500". See the attached timken engineering stuff. Same goes for
Koyo bearings

You can then use the EBAY bearings directly on the shaft. For the
prop flange end use two 38 pins 90 degrees to each other like Ross
did or use the extended point set screw trick. I suggest making a
static test rig for the extended point set screws and apply a 1000
foot pounds of torque. You can use your prop flange as one part and a
short length of tubing for the other part.

Paul Lamar



I already have a 2.250 4130 normalized tubing and I will get within
a day and I don't know the accuracy of the diameter. I saw in the
past you made a sketch for an aluminium made housing, could send it
to me with dimensions so I can check on the Rhino

JEAN PRUDHOMME

The zip has both IGES and 3DM files. Let me know if it loads OK into
  Rhino.

Paul Lamar


Paul I did open both files in RhIno Thanks


JEAN PRUDHOMME

If you see anything in here you (or anybody else) would like.... let
me know as I have dwgs on all of it in Rhino 3DM or IGES format.

Paul Lamar



Sure Paul you can send it




JEAN PRUDHOMME INSP


Which one? I sent a couple of dozen.

Quit using that cell phone for email :-) ROFL

Paul Lamar


The pictures include a sprint car set up. They use the 3"tube as the axle and it is exposed during service.
The center section is sealed to hold in the lubricant. One picture shows the bird cage bearing set near the end of one axle for spring mounting and fore and aft location. Lateral location is by a "Jacobs Ladder" or a "Watts Link"

It appears that Jeans reduction unit shown is using a side bell from some brand of a "Mini Quick Change' differential.
Perhaps a Frankland   http://www.franklandracing.com/ or a Speedway engineering http://www.1speedway.com/Whats_New.htm  Both have open tube sprint car rears and closed tube
(The piece you want) rears. Small sedans in Europe use the mini quick changes, so there must be a source
there as well.  Both MFRs have free downloadable catalogues. Perhaps Jean knows the brand he is using.
Lynn E. Hanover


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