Quote:
Originally Posted by NZtyphoon
Fair enough I missed #205 because it was so tedious reading all of your nonsense over again; here's #205
This is a post about the Merlin XX, which is a completely different engine from the III, using a two-speed supercharger which drew more power than the single-stage single speed unit of the III:
otherwise there is No evidence provided that R-R routinely tested its engines without superchargers, No documentation, No mention of a History of Rolls-Royce.
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I quoted the exact title of the book elsewhere (sry not with me as for now). It's one of the RR heritage trust. It's a study extracted from RR sources and internal documentation.
As I said, this small book written in 1941 explain why RR had to create new methods to predict the perf of a S/C Engine at alt due to the divergences of predicted perf and the real ones achieved during flight test. The authors were the very same guys conducting the work at the time.
It is also explained how the US was slightly in advance in that way. But also why RR conducted that work as improvement were still on demands.
The base engine to conduct this work was the NEW MerlinXX flight tested in a Hurricane II.
There is a lot of interesting curves that I hve re-used in my post (but no scan). Most notably no perf test was seen using the 12lb boost when top performance was the very base of that work
The book itself is cheap (10 to 20$ ?) and can be ordered simply via amazon if I do remind well. I had to wait 1 or 2 month to get a new print out of the roll. You may read (or ask ?) Viper2000 posts with whom I heard first abt that book.
~S
03-15-2012, 08:09 PM
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