Hello, im working on a Project and it has been a while since i did calculations With mechanics. The pool would be made in glassfibre with polyester and will be: L=2000mm W= 1750mm h= 400mm we use the E-module for glass, so we use E= 70 000 N/mm2 I= bh3/12 = 2000mm x 4003 mm /12 = 1,067 x 1010mm4 Supporting conditions: The tank would lay flat on the ground, so the pressure from the water is the only forces in place, and we asume the pressure would be 3,9kpa = 2080N The tank by it self is only for demonstration purposes, to illustrate how a scale-ship With DPS works. We will have Wind (by fans) and also a pump to make water flows in the tank. And the idea is that the Scale-ship would automatically adjust itself, and not move under these conditions. (this is offtopic and will be done With programming in LabView.) The weak areas of the tank would be the edges at the sides, as each of the tank's plates would be produced one by one and "welded" together. But we avoid calculating this, as it makes it too complicated. We might use aluminum ( the same E module) to support these edges, but this depends on our budget. so we need to calculate without it first. We are making this as a budget project assignment at our collage. Any tips on what formula's to use to calculate the thickness of the tank? or any tips in general? We need to start making the final worksheets in Inventor to hold our deadline, and thats why we need to figure out the thickness. I apologze for my weak grammar, i am Norwegian.