Radiator/cowling flaps

[bladeracer]

Originally Posted by horseback

I believe that in most cases, the main limiting factor for water injection for the R-2800 was the water available in the water tank. Whether the tank's volume was determined by space or the amount of abuse the engine could safely take in a single flight, I cannot say, but I do know that if you went to water injection/War Emergency Power, you were supposed to inform the aircraft's crew chief, who had to make several checks and tests before clearing the aircraft for its next flight (and often would say unflattering things about you if your reasons for the extra work seemed insufficient).

cheers

horseback

That's one reason I asked, some aircraft carry enough boost additive to exceed the specified usage limit so conceivably could use it several times without exceeding the limit in any single episode.
I think generally there were tells built in so the crew would know immediately whether WEP had been used, though not necessarily for how long.
In First Light, Geoffrey Wellum didn't seem particularly worried about WEP usage at all.