$8.$ What is a specific balancing challenge in radial engines compared to inline or V$-$type engines?

$-$ A$)$ Higher operational temperatures

$-$ B$)$ More significant piston wear

$-$ C$)$ Irregular firing intervals

$-$ D$)$ Greater radial forces

$9.$ What method is typically used to minimize torsional vibrations in engine crankshafts?

$-$ A$)$ Applying dampers

$-$ B$)$ Using lighter materials

$-$ C$)$ Increasing the diameter of the shaft

$-$ D$)$ Shortening the length of the crankshaft