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## Homework Statement

My vocabulary is pretty bad in specialized English, so I have to post a picture of problem

There are three pipes, the cross-section changes and all measures are illustrative, I need to find an easy formula to find the diameter of d3, so I can create formula in Excel and by changing numbers it calculates the answer.

δ[adm]=2%(l1+l2+l3)

## Homework Equations

Formulas are from topic of momentum and forces,

Maybe this helps

δ= M/W ⩽ δ[adm]

## The Attempt at a Solution

It should become something like ω/M max * some coefficients, but I havent found anything form books.