Prop Blade Effects
We often treat the propeller as a uniform “actuator disc” and the slipstream as a uniform stream tube of accelerated and swirling air. While...
Torque and P-factor
We’ve touched on this during previous discussions of slipstream (most recently in the April 2023 issue), but there are several power and propeller effects...
Thrust Line Effects
The propeller of an airplane generates thrust that drives it through the air. In addition to propelling the airplane, the thrust of the propeller...
Propeller Effects–Lateral Directional
The propeller slipstream affects the aerodynamics of the airplane. A propeller accelerates air backward and also imparts a swirl. The air in the slipstream...
Design Process: Slipstream Effects
In preliminary design and for performance calculations, we treat the engine, propeller and airframe as separate entities. The only engine effect we typically consider...
Design Process: Engine Size
The engine of an airplane must produce enough power to meet the requirements of all phases of the mission.
First, the engine must accelerate the...
Design Process: Strakes and Ventral Fins
On some airplanes, the basic empennage does not provide acceptable flying qualities in all flight regimes. Supplemental surfaces to augment directional stability, improve high...
H-tails and Triple Tails
The majority of airplanes use the conventional tail configuration with a single, centrally mounted vertical tail and rudder. Sometimes, however, the vertical tail is...
Design Process: T-Tails
A T-tail is a configuration where the horizontal tail is mounted on top of the vertical tail rather than directly to the fuselage. T-tails...
Design Process: V-Tails
A V-tail is a configuration where the horizontal stabilizer and vertical fin are replaced by a pair of surfaces mounted at a high dihedral...
In Case You Missed It
Floating Nut Plates
The floating nut plate. It sounds like it should come with an allergy warning,...
X Marks the Spot
Light and slow, yet lacking control skittishness, the X-Air is a simple and fun way to go nowhere in particular. By Bob Grimstead.
