Got it.
Here is the inter-active sheet for some basic things when considering upgrading or buying a new boat. Bit of finger trouble at my end.
It gives a starting point.
Column H is the one to keep an eye on. "Kg/hp ratio"
You can input in the yellow cells. The red cells automatically give the results and you don't have to work anything out.
The sheet is "protected" against accidental input and won't let you put anything in a "protected" cell.
Need to tidy up the right hand side to make it more useful when considering what accessories are needed to bring it up to what you want so looking for useful input there.
You can input whatever motor and boat details that you have looked at to give an idea of things.
The sheet also has a "last updated" window.
You can download and save the sheet to your computer for your own use if you wish.
Attachment 121506
Ignore the bottom attachment (below) in the grey box. Somehow it got uploaded and I don't know how to delete it.