In aircraft design, the “radius of a spark-ignition (SI) engine” typically refers to the distance from the center of the engine’s crankshaft to the outer edge or tip of one of the engine’s components, such as a piston or a rotating part within the engine. The radius is a fundamental parameter used in designing and analyzing various aspects of the engine’s geometry and performance.
Formula for Radius of SI Engine (r):The formula to calculate the radius of an SI engine depends on the specific component or aspect you are measuring. For a general calculation, you would measure the distance from the engine’s center to the outer edge of the component you are interested in.
- Radius (r) is typically measured in meters (m).