Spitfire M45 Rates

[71st_AH_Mastiff]

50% fuel, mirror on full weapons load, Stalingrad Map Autumn IAS

with the M45

 

   320 ft.......100m..20%...40%...60%..306...326...324 Mph...492...524...521 Khm...+16 @ 3,000rpm boosting 5 min...engine blew

 

1,000 ft.......500m.. 20%rad..40%rad..60%rad...307...317...326 Mph...494...510...524 Kmh +16 @ 3,000rpm boosting 5 min...engine blew

 

3,000 ft,.. 1,000m 20%rad...40% rad, 296...294 Mph..476...473 Kmh.. +9 @ 3,000 rpm

 

3,000 ft... 1,000m 20% rad...40% rad...308...306 Mph...495...492 Kmh +12 @ 3,000rpm 5 min rating

 

3,000 ft,..1,000m...20%rad...40% rad... 60%rad...324..323...306 Mph...521...519...492 Kmh, +16 @ 3,000 rpm boost engaged 4 to 5 min on this setting then engine blew.

 

11,482 ft...3,500m...20%..40% rad, 287...286 mph..461...460 kmh .+9 @ 3,000 rpm

 

11,482 ft...3,500m...20%...40%  297... 298 mph..477...479 kmh .+12 @ 3,000 rpm

 

11,482 ft...3,500m...40%...308 mph...495 kmh .+15 @ 3,000 rpm boost engaged

 

19,370 ft..6,000m...40% rad 269..268 mph..432..431.kmh, +8: @ 3,000 rpm

 

updated 71317..

Edited July 13, 2017 by 71st_AH_Mastiff

[Holtzauge]

Thanks again for doing the test flights Mastiff. As you said before, measuring actual in-game data gives us something solid to stand on.

 

To make comparing simpler I also plotted IAS in the figure (see below).

 

Some observations:

 

The figure of 589 Km/h IAS at 6 Km in IL-2 seems strange? Is it a typo? A plausible IAS at this speed is between 400-500 Km/h IAS.

 

Good correlations:

 

At 1 Km + 9 boost: IL-2 476 Km/h, C++ 467 Km/h which is a difference of +1.9%

 

At 3.5 Km + 16 boost: IL-2 489 Km/h, C++ 491 Km/h which is a difference of -0.4%

 

However, at 1 Km + 16 boost there is a bigger difference:

 

IL-2 535 Km/h, C++ 506 Km/h which is a difference of +5.7%

 

I think the Il-2 figure of 535 Km/h IAS at 1 Km is a bit too optimistic and it is actually possible to do a ballpark estimation using the method I described here to show that a more plausible speed at this altitude would be around 505 Km/h.

 

 

[CUJO_1970]

Wow, she is definitely on the generous side and I don't think there were more than a handful of those Merlin 45 at Kuban...

 

Looks more like a fresh on the western front Spitfire (which is fine) is what we actually have and not what was actually delivered to VVS.  http://lend-lease.airforce.ru/english/articles/spit/

 

Seems like they would consider adding a P-40 to this standard as well since the precedent is set here with the Merlin 45 Spitfire for Kuban theater.

Edited July 12, 2017 by CUJO1970

[Finkeren]

The Merlin 45 absolutely makes a difference, as I would expect. There's a reason the M45 equipped Spit Mk. Vs survived in service for much longer (into 1944 IIRC), while the high alt. ones were phased out ASAP.

[71st_AH_Mastiff]

updated

 

"However, at 1 Km + 16 boost there is a bigger difference:

IL-2 535 Km/h, C++ 506 Km/h which is a difference of +5.7%"

 

 

more than likely a typo on this one.

 

remember I could only sustain this for 4 to 5 min then engine blew.

Edited July 12, 2017 by 71st_AH_Mastiff

[JG27*Kornezov]

Holtzauge thank you for your C++ efforts.

71st_AH_Mastiff thank you for giving the time to test. Edited July 12, 2017 by JG27_Kornezov

[Holtzauge]

I just had a closer look now and it is interesting to see that for the figures at 3.5 and 6 Km altitude there is a good agreement with the IAS speed measurements Mastiff has done in BoX and my C++ calculations (as well as the RAE chart of course!). However, for 1 Km and below the difference is bigger and if you were to assume the 535 figure instead of the 510 Km/h at SL then the speed altitude chart would have a strange curve at lower altitudes which I think is another argument why 535 Km/h seems optimistic.