Sketchbook- Sketch models

You must be wondering what's a sketch model! So yeah, a sketch model is a  replica of how your end product will look like BUT using scrap materials like cardboard, wool, chicken wire, paper etc. it can be anything!
Below are my 3 sketch models I did for my 3D project.

Using plywood and bending wire as spring

Using cardboard and spring made out of bending wire

Using cardboard, plywood and woolen string

Importance of sketch models:
Just like an architect would test his design to check for stability and balance against natural disasters, you should test your design as well. 
Sketch models fit in exactly for this purpose so as to be able to visually notice errors and make necessary changes. 

• Image 1: Testing the weight of the plywood body against the strength of the springs
• Image 2: Testing the flexibility when using several springs
• Image 3: Testing the solidity of the body

During my making of, the sketch models helped out greatly as I noticed the springs wouldn't hold the weight and I was able to successfully balance off the weight with the springs and the tail of the fish at the end :)
Remember to always test designs and yeah sketch models yields in additional marks :D