LOL, What a load of garbage onemale, do you have any education beyond floor sweeping at all? You can not change the size without changing the values in the model. Garbage in, garbage out!<quoted text>
You are under the impression that Scale Modeling and testing designs and theories on scale model is something which is Anathema to Scientists and Engineers.
The insect spiracle-tracheal system is very efficient for a small body, but it simply would not work in a larger animal. The tracheal tubes would have to be much bigger around to serve a larger insect. They would have to take up too much of the insect's body in order to supply enough air to every body part, and if they had a much larger diameter, they wouldn't be able to extend into the insect's legs.