Drive shaft calculations. 1

[linamar]

Here's the problem I'm facing:
I'm working on a development project for a low power wind turbine.
The concept has been defined and a couple prototypes were built but no calculations heve been made to size the transmission shaft, housing and bearings. The prototype has a straight shaft with the rotor attached through compression rings, the bearings were selected using probably empirical methods and no stress calculations were made, at least not to my knowledge.
Since my job is to make it manufacturable in some quantities I have to start from scratch and redesign the shaft, rotor, housing and connector to the tower.
I only know the torque required to drive the generator, the weight of the rotor and this is all about it.
I haven't done such calculations in the last decade or so and I'm little rusty, and I would start with the shaft but I need to get a starting poing. We don't have FEA capabilities (can be outsourced for a fee) but there are analytical ways to calculate a shaft. I would appreciate if somebody could lend me a hand letting me know where and how should I start.
Thanks.

 

[unclesyd]

If you are still interested you might want to contact these people as they carry Nitronic 50 which is Aquamet/Aqualoy 22. They list there supplier as Elecrolloy. They also have the capabilities to grind and straighten a shaft.
They also list pre heat treated and stress relieved round bar in 41xx/4340 series.

http://www.specialtysteelsupply.com/index.php

http://www.electralloy.com/index2.php