I'll respond to your paragraphs by number.
1) The chassis is stiff enough to support the weight of the driver and all components attached to it. Of course the chassis flex makes a difference, but not at the rear of the kart.
2) The example is to do with load transfer. In the example given, the load transfer wouldn't alter at all. The same applies to seat stays and karts. Regarding the tyres suspension affect, this is far more prevalent in race cars since they run radial tyres (far softer sidewalls). Regardless, I know the affect well enough and it has no relevance to the topic at hand.
3) Obviously, but how is that relevant to seat stays?
4) How, how and how? How can the rear of the kart flex when one side is totally unloaded? Any flex (i.e. relative displacement between the two bearing hangers) is as a result of front end flex. However, I can't see this being the case when there is the rear cross member and the rear axle keeping them in place, each significantly stiffer than seat stays.
5) How? What's a "pivot point of chassis flex"?
6) You're saying the seat stays somehow put the load onto the rear bearing hanger. As such, if we ran with one seat stay, when accelerating, the resultant rearward load transfer would be directed more to one wheel than the other resulting in a turning moment. Do you think this happens? Do you think attaching a stay from the seat to one front stub axle yoke would have a similar affect?
7) I must remember that, when setting the anti-roll bar on a car, the side of the roll bar I "stiffen" makes a difference... or not.
8) Agreed. Generally the more proven route to success.
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