Ring speed?

[mijapxman]

I've just been looking at some screen shots I saved on my old iPad.

One interesting one (to me) I saved concerns ring speed. It was taken from the Modern Vespa site, the not so modern part, anyway, it was posted by oopsclunkthud, ( hope he doesn't mind me using

it here, if he does  I'll remove it) , this is what he wrote; 


The thinner the ring and shorter the stroke the higher the red line for float. Jennings covers this topic, Blair covers mean piston speed. Here some values  from a spread sheet I put together.


Redline based on mean piston speed and ring thickness


Stroke.         Piston         1mm ring.         1.5mm ring.          2mm ring

51mm.         10501.          10683.               8646.                     7441
54mm.         10320.          9917.                8352.                      7188
57mm.         9395.          10081.               8159.                    7021
60 mm.        8926.          9772.                7908.                      6806

[pxguru]

So what we can surmise from this is that, most are nowhere near the limit.
And these numbers are quite safe too. Another thousand on each would still be not too much