A lecture on using the HP 50g and TI-89 Titanium calculators, showing the very basics of both calculators and how they compare, along with lots of links to other documents. 23-page PDF file.
Describes how to calculate friction losses in pipes with the Darcy-Weisbach equation, the Coolebrooik-White equation, the Haaland's equation, and the Swamee-Jain equation.