[Fot] TR4 axle shafts

[Bill Dentinger]

Das ist gut! 
Bill Dentinger

MadMarx <tr4racing at googlemail.com> wrote:

>To get more knowledge about the TR4 axle this weekend I did the engineering
>calculations about the axle shafts in search to solve the question:
>
>Why do they break?
>
>I found out that on a stock TR4 the axles don't meet the safety margin
>required by German design rules.
>
>You need a safety margin on 1.5 and the axle with everything stock meets
>only 1.32 which might count off some miles of that axle on heavy road use or
>trackdays.
>
>On a race car it gets worse. My TR4 can do 1.5Gs on low speed corners. That
>is  quite a lot more than for a road car.
>
>The safety maring should be at  a factor of 1.5.
>On my racer it is 0.9 which means the axle WILL break! You need 1.0 to be
>just on the edge with break from overload.
>So the axle has very good reason to let go and the stock material must be
>excellent to withstand racing for a while.
>
>I calculated with 42CrMo4 which is a superior steel for axles, the 2nd best
>available in ancient times.
>
>So the way to go for me is with an new design that fits plug and play into
>the stock housings.
>
>I will take the TR2 shaft design as rough pattern but a lot stronger for
>racing purpose.
>
>I tell you if I will be successful.
>
>Cheers
>Chris
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