Gas turbines can deliver a high power-to-weight ratio, compact machinery, smooth shaft rotation, relatively few moving parts, and lower vibration. Their reliability at sustained high power and ability to burn varied fuels can be valuable at sea, while much of their waste heat leaves through the exhaust. Early engines also needed costly exotic materials, consumed fuel inefficiently at idle, responded slowly to changes in demand, and produced a distinctive whine. Reciprocating engines started faster and worked more efficiently at low speed. The balance of advantages and disadvantages explains why propulsion choice depends on a ship's operating profile rather than one headline performance figure.
Notable Point · 11:03-12:40
The trade-offs behind marine gas turbines
Gas turbines offer compact, smooth, high-power machinery, but early marine use had to contend with costly materials, poor low-speed economy, slow response, and noise.