PS - I know that RM2S was superseded by the combat rating of RM1S, but the existence of the rating implies that something was done with it, at least for a while. It also provides some "fossilised" evidence of the old RM1S rating.
I think that it is worth investigating, because the Spitfire II currently indicates about +8 psi boost with the cutout operated. Although some people say that this is just due to the boost needle hitting the stop, it's notable that in no-cockpit view the boost gauge goes up to +12 but also only indicated about +8.
I therefore have a sneaking suspicion that the Spitfire II is erroneously modelled with an engine having the RM2S takeoff rating. Either that or they just picked +8 arbitrarily.
In any case, it's probably worthwhile tracing this stuff through because if they match the top speed with the wrong engine power then the errors will manifest themselves elsewhere in the envelope (eg zero lift drag or prop efficiency will be wrong).
If, as I suspect, we have a botched RM2S then again, as with the 87 octane RM1S, I think it's probably worthwhile to fix it and just add an extra Spitfire & Hurricane model to the list, because choices are nice to have, and also because this would provide additional opportunities to crosscheck the airframe drag characteristic.
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05-11-2011, 01:47 AM
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