In Case You Missed It
Angle of Attack vs. Airspeed
Angle of attack indicators have been used by the military and airlines for years...
Variable Geometry Cooling System
The way to reduce or eliminate excess cooling drag in cruise is to use a variable-geometry cooling system that can change shape to control the amount of air flowing through the cowling.
All About Avionics, Part 7
If you intend to fly non-precision or precision GPS approaches, you really do need an IFR GPS. This article explains the options available and the legal issues associated with using the latest in-cockpit GPS technology for IFR navigation; by Stein Bruch.