How to find the diminishing ratio of the mouth of the fuselage and the end, for a STOL aircraft?

[sayujyabhandari]

How is the diminishing ratio calculated? Is there any optimal formula to it?

 

[TFF]

 

[wsimpso1]

 

[rv7charlie]

 

[Aerowerx]

 

[WonderousMountain]

 

[Pops]

 

[BBerson]

 

[sayujyabhandari]

 

[sayujyabhandari]

 

[wsimpso1]

 

[BBerson]

 

[Riggerrob]

 

[Riggerrob]

 

[Marc Zeitlin]

 

[BBerson]

 

[WonderousMountain]

 

[addaon]

 

[BBerson]

 

[Monty]