cjboy Lancs with Hercs
The mark 2 Lanc had Bristol Hercules 1650 HP engines fitted because RR could not make Merlins fast enough to satisfy the demand from all the companies who wanted them at the time. The other solution to the shortage was the American Packard Merlin fitted to nearly 4000 Lancs. The Herc engined Lancs built by Armstrong Whitworth were just 300 out of the total of 7374 Lancs made. They had a lower service ceiling and a higher fuel consumption but were faster at lower altitudes.