First of all this is for marine duty. Iam using a Gear which supplies the shaft flange good for shafts up to 4" in diameter but iam restricted to use a 4.5" shaft. In this case i have to design the flange .. iam struck here could anyone of you please guide me .. how to find out the flange length and thickness required..? the flange is made of high strength steel with material strength of 800 to 950 N/sq.mm. where as the shaft material is Aquamet22 and has a tensile strength of 87,000psi Please Help???