Quote:
Originally Posted by TomcatViP
Lol
- The XX was a post BoB product hence as a fighter eng it shld hve beneficed of the former improvements
- If 12lb MS is indicated it EXCLUDE any use of this level of boost above s/c alt
Sry but your statement does not match any engineering rules and is contradicted by the submitted text.
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The Hurricane/Merlin XX was introduced to combat in August 1940, but not given the designation Hurricane II until Sept 1940.
The text specifically allows 12lb boost in M gear for short periods of time during combat and during TO. It states the the boost override will provide 12lb boost up to 8500 ft after which it will gradually decline (to 9lbs at about 13000 ft):
Quote:
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3. The increased boost pressure will be effective up to approximately 8500 ft, above which the boost pressure will fall with increase of height.
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However, as I've stated there is no physical interlock preventing a pilot from using the boost override in S gear, and using the Boost Override in S gear will provide additional power up to about 19000ft. Yes, this is an overload on the engine and cooling system but every pilot flying a Hurricane II always had the option to engage the boost override at any altitude and in either M or S gear.