Apparently squadron deliveries of Mk II aircraft began in September, but IIRC, some late production Mk 1s received the Merlin 20 but retained the Mk I designation and these reached squadron service in August.

McKinstry and Mason both put the Mk II into service in September 1940 (see attached). Interesting bit about the Mk Is getting the Merlin 20...

Oh yes, I'd really like to see the Merlin XX Hurricane in this sim, hopefuly one day we'll get the 1941 scenario, too. Bf 109F is in there, just few steps to the rest :D

Sticking to the OP and doing some more testing it seems the Hurricane FMs (all of them) are seriously wrong on many many levels. Is the data from klem's test applicable for the in-game environment? Can we put that in context with Spitfire and 109 tests done by the others?

According to Wikipedia (yes, I know) it first flew on 11 June 1940 and went into squadron service in September 1940, also stated here
http://www.historyofwar.org/articles...rricaneII.html

Like the N engine 109s, there are more important things to fix. We should see it in BoM and N Africa - just starting a rumour :).

I am re-doing the tests. I need to set them against Density Altitude. Also I discovered that the BCO does work, I thought it didn't because it has no effect at SL and 1000 ft tests I did so I assumed it didn't work. However early indications are that it is stilll well below par at low level, more to come.

I'll post here when I finish and completely revise my OP.

OT
 

You're up early Klem!
56RAF_phoenix

Good stuff klem! I assume you meam BCO on original 87 octane Rotol Hurricane. Looking forward for the tests mate.

No, I mean BCO on the 100 octane.

On the 87 Octane it was there only as an EMERGENCY override, not a performance control. I don't think it does anything on the CoD MkI 87 octane but when I get around to testing that I'll see. There is a 'Boost' parameter that I pick up in the scripting and although the 'Manifold Pressure' parameter only appears to be a reflection of the gauge reading, the 'Boost' parameter goes higher. Early indications are that pulling the tit makes no difference up to 5000 feet where it still does not at 3000 rpm but does at 2650rpm. But its early days and I want to make more tests.

Where were you at 5:30a.m.?

Oh I am aware of that, but I got confused by DnR's testing on the other forum as he stated the BCO works on the old 87 octane Rotol, too. You can pull the plug for something like 0.02 lbs. boost increase as far I know.

Oh yes it does work indeed, from sea level all the way up to some 12000ft. Gauge reading is only +8lbs (wrong on both 100 octane aircraft, but the other way around)

All you have to do is:

1. Pull the tit
2. Wiggle your throttle back and forth (otherwise nothing happens)
3. Voila - we have BCC-O activated, boost gauge now reads +8lbs (I assume that's just a bug as the performance feels like +12, also wrong on Spitfire)

glitch: you have to set the mixture to lean in order to use it at 3000rpm as intended, on rich there is 2600rpm max (engine will shake the Dickens out of you if you don't). Speed on S/L is greater and the manifold pressure decreases nicely as you aproach full throttle height.