In article . net,
"Bill Garrison" wrote:

Question,

how much jet thrust to aircraft wieght would give equivilant or better
performance, over an existing recip engine?


It varies. You can determine rate-of-climb changes by the formula:

ft/min #
R/c = {eff*[hp(avail) - hp(req)]/wt }*33000

where hp = horsepower;
eff = prop efficiency;
wt = gross weight (lb)
33000 = horsepower/energy conversion