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In Case You Missed it

Aero ‘lectrics

Jim Weir provides a DIY alternative to the store-bought transponder antenna.

Wind Tunnel

Yaw rarely occurs without rolling, and roll rarely occurs without yawing. This month Barnaby Wainfan discusses coupled motion, including adverse yaw, the spiral mode and Dutch roll.

Cool Runnings

Norm Ellis does the math and shows you how to select the right oil cooler for your engine-cooling package. Given the critical role oil temperature plays in engine health, its a good idea to go beyond selecting the smallest, lightest and cheapest cooler you can find.

Build Your Own Leak-Down Tester

Converting a Harbor Freight compression tester for aircraft engine use.