Modelling engine wear and WEP limitations

[Seadog]

"I had to return from Nuremburg in a Wellington II on one engine and used maximum boost and revs on a Merlin X for five hours with no sign of distress..."

= +10lbs at 3000rpm.
The Merlin in Perspective,p25.

[TomcatViP]

Merlin X (two stage - two speed s/c) later eng model (with 1145 HP and 9lb )

[Kurfürst]

Originally Posted by TomcatViP

Merlin X (two stage - two speed s/c) later eng model (with 1145 HP and 9lb )

In 1938 it was probably an early internal RR - and not a service - designation (X = eXperimental?) for a Merlin with 100 octane IMHO.

[TomcatViP]

X stand for 10 - Beware that all those long night of typing might hve put some excessive strain on your brain eng