In Case You Missed It
What’s New
DRE has a new ANR headset, Approach Fast Stack Pro-G Hub is issued a PMA, and the Hummingbird heli quickbuild kit gets FAA approval.
Ask the DAR
DAR Mel Asberry continues his discussion of operating limitations and Phase I flight-test requirements.
Air Power
The art of porting cylinder heads, whether by hand or by CNC machine, is a valuable part of blueprinting detailed engine builds or overhauls, and surprisingly subtle changes can determine how efficiently the engine will breathe.