I play with full poly but curious as to speed gains on serves and strokes if i hybrid with natural gut. Say I max my serve at 96mph with full poly, what could I possibly max at if I hybrid with natural gut?
Are you sure poly string was available 50 years ago?..I tried gut hybrid once after nothing but full poly for about 50 years and it was a rocket launcher. Same racquet and tension but same shots were out by 10 feet. So I'd say the power level increased 10 or 15 mph.