power loading
/ˈpaʊə ˌləʊdɪŋ/noun
1Chiefly Mining. A mechanized method for loading materials on to a conveyor belt, especially coal at the coalface.
2The weight of an aircraft (when fully loaded) divided by the total engine power.
Origin
Early 20th century; earliest use found in Anaconda (Montana) Standard. From power+ loading.