Good morning Georges Finally I did,t go to Sun&Fun it's my birthday
today and my wife did organized a party surprise brunch yesterday and
I was ready to go Saturday and comeback Sunday, anyway it will be for
next year .


I am sending you more photos of my gearbox attachment.


JEAN PRUDHOMME INSP,



Jean, NOW THAT’S IMPRESSIVE. I need to catch up on Paul's site to
see if there are additional details. Did you have any problem with
the bolt up to the back of the Mazda engine. If you are not using a
drawing I sent you could I have one of the interface you came up
with If you are using "standoffs" between the block and gearbox you
might save time getting them from the Cozy Girls who do CNC milled
versions that really look impressive. George Grimes




Paul and Georges

Almost done before assembly. I do have the end shaft to be treated
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

Clever use of a sprint car quick change bell.

Those big ball bearings are way over kill and very heavy Jean.

A planetary puts no load on the bearings except in a spin or stall
and then it is not much.

Much lighter to use needle bearings like the Ross. Old Lew Ross was
a good engineer and he got it right back in 1973. RIP.

Jean's box will work of course. Just heavier than it needs to be.

Paul Lamar


Paul I can use the NKIB5909 up front see link
http:www.fastenal.comcatalog_pages201314-5.pdf



JEAN PRUDHOMME

That is a great idea. I like it. That will save weight and simplify.

Pretty expensive :)

Paul Lamar


If this NKX bearing is used at one end of a prop shaft, and a plain roller bearing is used at the other end of the prop shaft, it would constitute a “locating floating” bearing arrangement, common in shafts subject to thermal expansion, where deep groove ball bearings at each end would not allow thermal expansion of the shaft, and as a result, when warmed, the shaft exerts excessive axial load on the ball bearings at each end.  This arrangement is common in aerospace shafts, like jet and turbine engines.  I will use such an arrangement in any long prop shaft I use in my design.

Here are a few short paragraphs on this subject:

http://www.cylindricalrollerbearing.net/news/Locating-floating-bearing-arrangement.html
<http://www.cylindricalrollerbearing.net/news/Locating-floating-bearing-arrangement.html
Roadway

bridges also use an analogous arrangement, being fixed-hinge “pinned” at one end, and resting on giant roller bearings at the other end of the bridge, allowing for expansion and contraction.

I just got back from Sun n Fun.  I can share my observations with anyone who wants them.

Gene Kahn




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