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Diablo310th
10-22-2007, 11:02 AM
Here is some interesting data I found about the D27 and D27 Late Jugs. Maybe some of you that are more learned than me can interpret better as to if something is off here.

P-47 D and P-47 M Hp Data

Dated 6 Oct 1944
Site used for hp data: http://www.spitfireperformance.com/p-47/p-47.html

P-47D P-47M
WEP 2600 hp 2800 hp


Pulled from Aircraft Data from fmd files extracted from the sfs file.

P47-D27
[Engine]
Engine0Family PrattWhitney_R-2000_Series
Engine0SubModel R-2800-59_THRU-40
[R-2800-59_THRU-40]
HorsePowers 2000
BoostFactor 1.1
WEPBoostFactor 1.18
2000hp x WEPBoost 1.18= 2360 hp diff. of 240 hp

P-47D27 Late
[Engine]
Engine0Family PrattWhitney_R-2000_Series
Engine0SubModel R-2800-59_THRU-40_overboost
[R-2800-59_THRU-40_overboost]
HorsePowers 2000
BoostFactor 1.1
WEPBoostFactor 1.24
2000hp x WEPBoost 1.24= 2480 hp diff. of 320 hp

Diablo310th
10-22-2007, 11:02 AM
Here is some interesting data I found about the D27 and D27 Late Jugs. Maybe some of you that are more learned than me can interpret better as to if something is off here.

P-47 D and P-47 M Hp Data

Dated 6 Oct 1944
Site used for hp data: http://www.spitfireperformance.com/p-47/p-47.html

P-47D P-47M
WEP 2600 hp 2800 hp


Pulled from Aircraft Data from fmd files extracted from the sfs file.

P47-D27
[Engine]
Engine0Family PrattWhitney_R-2000_Series
Engine0SubModel R-2800-59_THRU-40
[R-2800-59_THRU-40]
HorsePowers 2000
BoostFactor 1.1
WEPBoostFactor 1.18
2000hp x WEPBoost 1.18= 2360 hp diff. of 240 hp

P-47D27 Late
[Engine]
Engine0Family PrattWhitney_R-2000_Series
Engine0SubModel R-2800-59_THRU-40_overboost
[R-2800-59_THRU-40_overboost]
HorsePowers 2000
BoostFactor 1.1
WEPBoostFactor 1.24
2000hp x WEPBoost 1.24= 2480 hp diff. of 320 hp

JtD
10-22-2007, 11:51 AM
2000hpx1.18x1.1=2596hp

2000hpx1.24x1.1=2728hp

P-47M is not P-47D-27late. It has a R-2800 C-series engine instead of the B.

Viper2005_
10-22-2007, 11:55 AM
This implies that both D27s should have the same top speed at 100% power or less, and also at 110% power when their water finally runs out.

Maybe somebody who has the time could test this?

Diablo310th
10-22-2007, 12:06 PM
thanks Jtd...Fatcat and Brain over at CWoS caught my error too. Viper...according to this that is true. Is that correct tho considering the D Late is using 150 octane?

JtD
10-22-2007, 12:29 PM
Depends. 150 octane could also be used for higher boosts without water, but I'm not sure how often it actually was.

KIMURA
10-22-2007, 12:46 PM
150octane was "given up" somewhere around April 45, because of the enourmous harm to the spraking plugs. With 150 grade fuel sparking plug lifetime dropped down to 2 sorties, whereas with lower 130? fuel the lifetime was around 4-5 sorties.

Cajun76
10-22-2007, 02:14 PM
According to IL2 Compare and Hardballs, the -27 is actually slightly faster at SL when at 100%. They are the same at 2000m, and by 3000m the Late pulls ahead.

Looking at IL2 Compare, I thought there was a bigger difference between the two.

However, the biggest difference between them is not shown be the graphs. The Late can maintain a faster high speed climb. This is different than max ROC and zoom climb. It's the ability to cruise at a rather high speed and put distance between you and the ground at the same time. This is where the extra power is really noticeable, for me anyway.