Sorry to be the fly in the soup, but not so! (although a common mistake)

The loop of an endless loop string is EXACTLY as strong as the string itself. True, it has half the strands, but the tention on the string is equaly devided between the two "glands" of the loop. So half the strands carry half the load. (It's also truefor the very tip of the loop)

This is basic mechanical engineering (and I had my share...)

Indeed, the flemish has stronger loops than the endless, but having a loop twice as strong as the string, has no value.

It may have some value if there isserious stress consentration in the loop, like around sharp cornets. But I suspect that's not the case thanks to the cushioning provided by the serving, and the elasticity of the string (in dacron).

It does puzzle me why is the concensus that flemish is faster (not that I know otherwise). Flemish is much more twisted than endless, so it's bound to have more mass per inch. It has more surface, and a non-smooth one (ie, less airodynamic).

So how can a heavier string with more drag be faster?