[PSUBS-MAILIST] website updates

[Jon Wallace via Personal_Submersibles]

I've added a couple of things to the website.

1) Equipment Reviews
www.psubs.org -> Resources & Reference -> Equipment Reviews
We'll use this page to keep track of products or equipment that is known 
to be either good or bad for small submarine purposes.

2) Oil Compensated Motor Pressure Tube calculator.
www.psubs.org -> Resources & Reference -> Design Tools -> Calculators -> 
Pressure Compensation Tube Calculator
Ok, that's a mouthful...but in reference to the discussion lately 
surrounding oil compensated motors and using an open ended tube to 
resolve issues with air bubbles...enter max depth and tube length, and 
this calculator will tell you the length of the resulting air bubble at 
depth that separates the motor oil from the ambient water.

Jon