Wind Tunnel

Multiple engines complicate design, because not only must the airplane be able to maintain flight on one engine, but also the pilot must be able to control it. Lateral/directional stability issues are key;

Wind Tunnel

In order to bank the airplane and execute a turn properly, adverse yaw must be countered or eliminate altogether. The discussion of how to do this includes rudder control, aileron-rudder interconnects, directional stability, differential ailerons, aileron drag and the use of spoilers;

Wind Tunnel

The aerodynamics of an airplane sometimes don't cooperate with the pilots desire to roll, and instead produce both yaw and roll. Contributing factors are aileron parasite drag, induced drag between the wings and changes in the roll rate itself;

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.

Wind Tunnel

This month columnist Barnaby Wainfan takes a look at how the airplane responds in roll when the pilot is maneuvering. Two key factors are roll acceleration and the steady-state roll rate.

Wind Tunnel

The discussion of lateral/directional stability continues with an examination of dihedral effect and the effect of roll;

Wind Tunnel

Pitch is not the only axis involved in making an airplane fly well. Yaw and roll are also important, and this month Barnaby Wainfan turns his attention to lateral/directional stability and its effect on flying qualities.

Wind Tunnel

When is an airplane in trim? At least to the pilot, the airplane is trimmed when no stick force is required to maintain equilibrium. So how do we achieve this? Barnaby Wainfan explains any number of ways to go about it, including the use of trimtabs, spring systems, sparrow strainers and variable incidence tails.

Wind Tunnel

This month Barnaby Wainfan turns his attention to the control system and how various aspects such as linkages, the elevator planform and tail aspect ratio, and trailing-edge treatments affect pitch control.

Wind Tunnel

The diagnosis of pitch sensitivity problems boils down to one of two things: too little static margin or control system problems. This month we discuss how to modify the airplane to fix them;

In Case You Missed it

Editor’s Log

Chasing ratings.

Light Stuff

The Sport Pilot rules allow you wide latitude in changing categories of aircraft without a lot of re-training, opening up intriguing options for pilots interested in diversifying their flying. By Roy Beisswenger.

Aero ‘lectrics

Anatomy of ADS-B.

The Dawn Patrol

Dick and Sharon Starks and The Dawn Patrol make their annual, magical pilgrimage to AirVenture Oshkosh. Mix in a big, surly storm, the Wild Snorting Piglet, and an Air Force Brigadier General, and you've some something to write home about.