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Boat Forum / Building / December 2006Calculating Prop Shaft Diameter
Hi, I'm making a large scale (13ft) model submarine and am currently designing the propulsion unit for it. If I told you I have a 2hp driving a 3 bladed prop would someone here be able to tell me a suitable prop shaft size? Cheers, Michael No, but if you told us what submarine, what scale you were using, (what prop diameter), then max torque could be figured. It is torque and prop shaft length that determines shaft diameter, not HP. I would hazard a guess at .625 to .750 inches. Steve > Hi, > [quoted text clipped - 7 lines] > > Michael > I'm making a large scale (13ft) model submarine and am currently designing > the propulsion unit for it. Try going to psubs.org. They're building manned ones, but as small as your model. Someone there can lead you to the answer. M Are you designing the sub. to meet performance specifications? Does weight matter or does it interfere with the indented performance. Some time, you may have to cut the weight down from the start. If this is the case the weight and size of the shaft will matter and you may have to select the proper material to maintain the weight requirement. >> I'm making a large scale (13ft) model submarine and am currently >> designing [quoted text clipped - 4 lines] > > M > Are you designing the sub. to meet performance specifications? > Does weight matter or does it interfere with the indented performance. [quoted text clipped - 10 lines] >> >> M Thanks Guys, M, I'm a member of the Psubs mailing list but I must admit I didn't think to ask them. Marierdj, I've worked out the sub has to weigh around the 2000kg mark before it will sink, and generally speaking you have to add lots of ballast to get 'em to dive so not too worried about weight. Steve, I've done the math, and using the data on the motor, I've calculated that the max torque is 0.78Nm (7 pound inch) and with a shaft length of 1m max. Cheers, Michael |
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