Seafire IIs had the Merlin 45 and Merlin 46 as well, they were converted Mk Vs. I dont have #s on how many of each. There was a Seafire LIIC, which we dont have in AH, that had a Merlin 50M (low alt engine) I beleive. Seafire III came after that.
I tested it again offline and the wep runs out in 5 minutes maximum, from takeoff cold, or warmed up (go ahead and time it). The "max boost" of +16 lbs starts to drop off after @14,000 ft (at 20k you get +9 lbs max with wep on), which matches the data I have seen on it, which is the same link you posted to me. In addition to that its speeds all seem to match very closely to whats posted there. I have yet to see any example of it being too fast for a certain altitude, despite all the claims of its overmodelling. If its developing too high a bhp at a certain alt (and thats the accusation), that would show up as a faster speed, and it doesnt.
Imho, most of what it boils down to is HTC engine modelling, which we all know is a rather simple design. All the a/c, wether its a 109, P-47, or a Spitfire, have the same "wep" then "overheat-off" model to them. Im all for making them as accurate as possible. That way we can all argue even more stuff after guys complain they blow their engines too much
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