didn't know about the hurris in France, thanks:cool:

Neither did I! I like the fact the 12lb boost was a field modification that squadrons could undertake themselves. If memory serves, it could be done in the space of a morning (might be getting confused with a Sopwith Camel though...don't ask!).

Sure it was not Belgium?

Lille and I think Vitry is in Belgium.

something seems off... I can climb in a mkIIa @2k ft/min on 4lb boost with my prop set at 2500rpm with a speed of ~230 IAS....

If I take the mkIa (with its bugged prop) and try a climb angle of 2k ft/min with my boost set at 4 and my prop set at coarse making the revs about 2300/2400 rpm i can only manage about 180 IAS.... and thats only for a short peroid of time.. after a few thousand feet ur boost drops to 0 and u cant maintain the 2k climb angle...u can barely maintain 1k!

and also with the mkIa at 18k feet with the boost at 4lb and the prop set at coarse I only manage to hit 240 IAS thats hardly 200 MPH TAS!

how is it possible to reach the planes actual top speed (which is 350 mph IIRC)?

I can assure you 240 IAS at 18k is not hardly 200 TAS.
More like 325 using the common 2% rule.

EDIT
Easy rule of thumb is "deviation is about 2% each 1000 ft".
In this case: 18*2=36, 240/30=8, 240+80= . . . you get the idea.

EDIT2
Or use bombsight table 2 lol
Probably more convenient.

If I were doing 240 MPH IAS at 18,000 ft, I'd be pretty happy as I'd be tootling along at 330 MPH TAS. That's according to Bombsight Table 2.

P.S. Flying Pencil, they're both in France (Lille is very close to the Belgian border) and yes...I had to check on google maps!

Given the 1C have handed out Spitfire pilot notes books with the collectors edition I imagine that they will have to match whatever settings are in the book.

Boost drops off with altitude so you have to apply more power as you ascend, did you do that??

my mistake i was reading the CoD manual wrong... the manual says 225IAS @ 18k is 296TAS... After trying it again Im just hitting 220IAS which would make it more like 290-ish TAS

either way its not what the aircraft should be doing at that alt!.. at spit mkI with a MerlinIII engine with a 2-pitch prop should be doing at least 350 TAS at 18K

this is way off.

Now the mkIIa seems spot on...

@18k on full WEP boost (only managed 4lbs at that alt) with the prop at about 2850 revs I was able to hit the 280IAS mark (354TAS) which is what it should be!

the mkI's seem to be off...I'm not sure about their climb rates being off yet but the top speeds are DEFINITELY off.

In summation: mkIa's prop is bugged , there is no added boost when WEP is applied and it wont hit its top speed at alt (18k ft)

good work Biggs:)