General Electric LM1500

The LM1500 was derived from the J79 engine in 1960.^[3] Its first application was for the first US sea-going research hydrofoil, HS Denison.^[1] Conversion as a marinised turboshaft engine involved two major changes: the addition of a free power turbine, and corrosion-protection by the addition of internal coatings and a maintenance scheme of freshwater rinsing to prevent salt damage. Naval fuels could also include diesel fuels with higher sulphur content than aviation-grade JP-5 fuel, but this was avoided in these early engines by keeping to JP fuels.^[1]

Its first commercial use was as a catapult for launching aircraft.^[4] Over time, its commercial applications widened to include marine propulsion^[5] and its use at oil and gas pipeline compressor stations.^[6]

• Official site (GEAE)^{[permanent dead link]}.