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I work for a tank manufacturer and need help on designing a handrail for a stairway that will be bolted to the tank. The tank is 46' in diameter and 45' tall. The stairway is at a 35 degree pitch from horizontal. I have the stairway figured out, but I need to tell the shop guys the correct diameter to role the stairway railing. We are using 1 1/2" steel pipe for the railing, so when it is physically rolled, it is where it is and if I don't give them the correct diameter I'll be getting a very nasty phone call. I've looked everywhere but can't find a formula to figure it out.


Simply put: how do I calculate the diameter of a spiral running up the side of a cylynder?


Thankyou for your time and consideration.


Sincerely, Johncarl

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