Friday Update, February 10, 2012

[Kwiatek]

Originally Posted by Robo.

There are actually several versions of Spitfire Mk.I pilot notes (various updates etc.) and even me, far from being an expert I am aware that the above document is from XII development (eg Merlin III that became XII after various modifications) If you're expert offering your services within this specific era you should really know that, that's basic stuff.

Sorry about off topic.

Well nothing is such simple like you think.

Generally rising fuel octan casue higher engine ratings - it is clearly show in many different manuals for different planes ( Spitfire MKII, Tempest etc).

E.x. Spitfire MKII manual:



Brackets - 87 octan fuel, no brackets - 100 octan fuel engine ratings.

I dont want to lead academic debate but there is any info that document about Merlin III new engine ratings is taken from XII development (eg Merlin III that became XII after various modifications) - it is only someone speculation.

Some short uptades in Spitfire MK1 Merlin III manuals said only that with 100 Octan fuel +12 lbs boost was allowed for emergency power - there is no mention about full engine ratings with 100 Octan.