We agree on most of that, John. I have been trying to explain for YEARS that it is ONLY the wall thickness (and possibly, internal shape) that will affect the axle stiffness. Others have been trying to say it's the MATERIAL of the axle which makes the significant difference. We BOTH know it's NOT!
We only disagree on whether the SCALE of the change of 'stiffness' could be detected by the stopwatch or the driver. Secondly, I remain to be convinced that the effect would be CONSISTENT between chassis, seat settings, drivers, tyres and weather conditions, etc. etc. etc.. I thus have argued that 'stiffer does X' is TRIPE! On the scale of things, I'd argue that there are TONS of other changes to do before needing to start adjusting axle thickness becasue the effect is so small.
However, that's NOTHING to do with what we are discussing, here. At least, I can't see that it is.
The discussion is whether reducing the 'overhang' of the axle, beyond the furthest-out point of contact with a hub (or even, within the hub) can alter the stiffness of the axle UNLESS there is movement between the hub and the axle...... and if there is.... I'd black flag you....!
Let's give an example. You have a hub where the axle CAN extend beyond the outer adge of the hub. You place your hub on the axle so that 10mms of axle protrudes beyond the hub on one side of the chassis. Now... you set the hub identically on the OTHER side of the kart but THIS time, you circumcise the 10mm overhang of the axle so it's now flush with the hub-end. For this discussion, all other matters are equal, both sides!
The position of one of your earlier replies appears to suggest that you believe that the 'circumcised' side of the kart is now SIGNIFICANTLY STIFFER than the 'cavalier' side of the kart even though they would have yielded IDENTICAL stiffness values had one NOT been circumcised.
It's THAT bit which beggars belief!
Yes, I C*A*N suggest ways in which the extra mass of the 'cavalier' end of the axle would act as a microscopically small 'mass-damper'.... but I can't imagine a SERIOUS thinker believing the infinitessimally small increase in damping would be measurable, let alone have an effect on the 'hopping' reactions of the chassis. Whatever else, the REACTION of the handling would not PREDICTABLY change with amount of circumcision. I.e., the change of handling would not be linearly related to amount circumcised!
Please state clearly if YOU think the circumcised end of the axle:-
1) is now SIGNIFICANTLY stiffer (or 'looser') than the uncircumcised end. (That's what you appeared to have stated, earlier)
2) would be likely to affect SIGNIFICANTLY the amount of 'hopping' suffered by the chassis
As you can tell, I do NOT believe either of these 'fairy tales'!
Ian
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