Sir, heartily thanks for your reply.
Thanks for suggested model based program .
Really ratio of Wingspan to propeller is not complete without considering weight of model and area of Wingspan.
I also found a good web to find those all things, this is not work on model base, Here I properly understand that how motor KV, propeller size, pitch ratio effect overall efficiency according to wingspan, area of wing, weight of model.
Web link - http://rcplanes.000webhostapp.com/calc_motor.htm
This is very clean web, free of cost, there results are not dependent on particular brands limitations. At the results we will find best perfect Battery (2s/3s/4s/5s/6s), Motor KV, Propeller size, Propeller Pitch ratio, propeller tip speed, flight duration, Ideal efficient speed etc.
Hear we need manually adjust combinations of battery, motor KV, pitch ratio according to our model plane Wingspan, area, weight. At the results we will find top efficient combination of flight duration and flight speed with graph.
Sir, please correct me and add if I am missing something.
I Google this topic "Wingspan to Propeller ratio" before post this topic , this is very common confused questions from many flyers like me also, but I observe no one has properly cleared this topic. So I think this discussion is end of "Wingspan to Propeller ratio", this discussion may help to many designer to design efficient model Airplane. So please correct me or add from your side if I am missing something.