Just for the record, I bought the Midwest Lobster Yacht premade by DonnieBoy, Don has been my mentor for all things rc and building materials, motors, gears, learning how to use fibreglass cloth, and much more. Great guy!

Don't worry, it's not mandatory.
The relationship is only between vessel length and diameter.

The other data, such as: the weight, the number of blades and the material can be useful to those who want to make a choice starting from zero information.

For example, two identical long boats have a different relationship, even if only slightly.
Let's analyze in detail and discover that the one with the larger propeller is heavier.
It is coherent and the reader will have more general guidance.

The type of transmission is one of these non-mandatory data.

You need to know if geared or direct drive?

If geared, since most of these were given to me second hand the gear ratio is not known on all of them.

Hi Ron, sorry for the delay, I added your ships to the report list in this link.
If there are any errors, tell me.

https://model-boats.com/forum/135991#135991

Hermank is absolutely right, very good Ronald.

Ronald canadian modelboat builder
Whaw what a Nice collection of boats you Made throughout the years. You can be very proud !!!!!👍