Actually, not too far off
Black 6's Figure for "the patch" - as I read them:
Spit 1a: Max level speed:
@6000m / 19,700ft: 350 mph (563 km/h)
@3000m / 9,850ft: 303 mph (489 km/h)
Figures from the weblinks posted:
Spit 1a: Max level speed:
@6000m / 19,700ft: 355 mph
@3000m / 9,850ft: 320-355 mph (depending on fuel 87/100)
So the patch is
1.4% on the low side at 6000m (I can live with that)
And the patch is
5% on the slow side at 3000m if you're assuming 87 octane, but a more significant 14% on the slow side if you're using 100 octane
I'd like to see sea-level Flight model information for the above, but it seems to me the model is very close to the 87 octane fuelled spit 1a. VERY CLOSE. And I am now happy to accept that.
The real question is - will/should they model 100 octane?