No joke: 248mph Hurricane dh5-20, 230mph Spit... what on earth is going on??

[Momod]

Originally Posted by ATAG_Snapper

Great thread with great input from everyone.

Agreed, seems every time I fly on ATAG I eek out a bit more performance out of the red planes thanks to the input on here, will try the Spit 1 later
Salute to all

[ATAG_Dutch]

Originally Posted by trademe900

17,000 feet:

dh5-20: 248mph (course/low rpm)
rotol 100octane with tit pulled: 220mph (just before engine blows)

Spit 1: 265mph (course/low rpm)
Spit 1a 100oct with full emergency boost: 230mph (just before engine blows)
Spit 2a full emergency boost: 230mph

I used the table in the game manual to convert to TAS, but of course figs were given for 16,000 and 18,000ft, so the conversions are very rough. I'd be happy to stand corrected if they look off.

DH5-20 320mph
Hurri 100oct - 292mph

Spit I - 338mph
Spit Ia - 296mph
Spit IIa - 296mph
Spt Ia100oct - 295mph
SpitIIa - 295mph

[trademe900]

thanks for those conversions

[Osprey]

Our server, 71st and ACG Combined, runs with temps off. Try them there.

[5./JG27.Farber]

Dont forget there is a difference between TAS and IAS...

During the Storm of War Campaigns: Battle of Britian we went through 3 patches of the game and you can see the reds switch aircraft each patch.. I thought this was quite interesting also.

[IvanK]

Interesting. I get in the case of the Spit MKI DH 2 Pitch and Spit MKIA CSP a 20MPH IAS diff at FTH. With the DH 2 Pitch being 20MPH IAS faster with Coarse pitch +6lbs. Compared with real life this is a little bit out as they should be a lot closer than this. Converting to TAS results in my test to a 16MPH TAS differrential


TAS in figures below.

[NZtyphoon]

Originally Posted by ATAG_Dutch

I used the table in the game manual to convert to TAS, but of course figs were given for 16,000 and 18,000ft, so the conversions are very rough. I'd be happy to stand corrected if they look off.

DH5-20 320mph
Hurri 100oct - 292mph

Spit I - 338mph
Spit Ia - 296mph
Spit IIa - 296mph
Spt Ia100oct - 295mph
SpitIIa - 295mph

I don't suppose posting the chart, with conversions, will be a problem in an IL2 forum:
Red = trademe900
Blue & red = ATAG_Dutch conversions
Brown & red = RAE figures from Price - The Spitfire Story 2010

[Momod]

Just did some more testing, 1000ft with boost, 50% rads and 2500 revs when appropriate
Spit 1 250mph
Spit 1a 265mph
Spit 1a 100oct 290mph
Spit 11a 280mph
Hurri DH5-20 262mph
Hurri mk1 100oct 274mph
Hurri Rotol 258mph
conclusion :- 100 octane give superior performance at low altitude

[ATAG_Dutch]

Thanks Momod. I've done a lot of testing recently, and quite honestly I'm glad other people have 'taken up the baton' as it were!

This is as it should be, the 100oct should only have improved performance up to a certain altitude, which I forget at the mo.

The whole issue though, brings the problem of altitude inaccuracies in the game back to the fore. The fact that none of the aircraft can achieve documented operational ceilings makes one wonder how the 'atmosphere' is modelled. So the performance we get at 17.000 may reflect RL performance at 25,000 or something like that. This is one of the reasons I've done most of my testing at low alt. I don't trust the 'atmosphere'.

That still doesn't explain the DH5-20 Hurri being so much faster than the IIa however, at any height!

[Momod]

Last month I flew the Hurricane DH5-20, This month I`ve been flying the Spit 100 octane but last night I tried the Spit 1 and it seemed very good climbing out and at 15000 plus but on one flight I tangled with a 109 at different altitudes and ended up low where the performance seemed poor compared to the spit 100 octane, This seems to be confirmed by the top speed tests I`ve done at the different altitudes, It almost feels like they have recreated the High fighter/Low fighter configuration of IL2 1946
~S~ 56RAF_Rumba