I am trying to calculate the theoretical deflection of a flywheel on a large diesel engine in an attempt to use it in measuring generator efficiency. I need to theoretical values in order to better understand instrumentation needs. I want to run the test in place and space is very very limited. It is a steel crank shaft on large marine diesel engine. The crank is bolted to a 38.5 in diameter x 1.5 in thick fly wheel. A 35.5 inch by .75 inch thick 'flex plate' is bolted to the fly wheel with bolts on 34 inch centers. It is bolted through a spacer ring that separates the two plates. The 'flex plate' is then bolted to the generator drive shaft. So engine turns crank which turns flywheel. Fly wheel turns flex plate. Flex plate drives generator shaft. Does anybody know how I can calculate deflection of a rotating disc which will allow for a load to be applied at a known radius? I have attatched a pdf with a rough sketch of the system. I do not need it solved, just a hint as to how to approach the problem. Thanks.