What it says on the box, shouldn’t the P-47N climb faster than the D-28?? The model we have has 70Hg of manifold pressure. so this should be the PREMO model besides the P-47M.
Yet in game, climbing from airfield to 5000 meters at 290kmh +/- 2kmh, the P-47D-28 is faster by over 20 seconds than the N model.
Or is this a case where gaijin messed up engine parameters again?
The N was 4000 lbs heavier than the D AFAIK.
What aircraft weights were those figures at?
The P-47N-15 has a lot more weight in the wings from additional internal fuel tanks to extend its range, as it was mainly an escort fighter version of the P-47 for the B-29 in the Pacific War. It’s also worth noting that it also carries 600+ more rounds of 12.7mm ammunition than all the other P-47s, which also contributes to its weight factor.
Imagine if they Made a P-47 with the same design thought give to the P-51H
It was heavier, but seeing from what I’m seeing these tests coalesce (5 mph difference) with the Fairchild tests and they were in ‘standard configuration’ with 13962 pounds as the gross weight. the P-47N if I recall in game both at minimum fuel, the N is roughly 1000lbs heavier empty weight wise. Gaijin removed 512kg from the empty weight of the N recently. but fuel does add an extra 1000lb making it a 2000lb difference
In flight with 23 minutes worth of fuel the P-47D-28 weighs 5773kg / 12729 lbs
the P-47N with minfuel 6382kg / 14069lbs. So literally this is a 100lb difference compared to the document and in-game.
What I don’t get is documentation is showing the P-47N should climb faster than the D-28. Yet it’s not.
Looking at in-game horsepower figures, the P-47N for some reason is producing less horsepower than the D-28 at low altitudes. which makes no sense considering all documentation shows the N variant produces 2800 horsepower WEP at all altitudes.
They did. XP-47J.
I really wish we could get that or XP-72 in game but with the records gone its unlikely
We got the flight manual for the XP-72 A lot of prototype planes we have the flight manual for and they still have the same flair that the you see the old ww2 flight manuals have.
oh, didnt know that, hopefully there is enough in that to for gaijin to make a full flight model then
Both of these images show that the engine horsepower changes with altitude, and that it does not have peak horsepower at sea level.
Afaik, the main contributing factor in game is the fuel load. Since the game forces you to bring 30% as min fuel, the N has a much longer min fuel time than the D
Thanks for the documents. But now I have to ask. Why is the D-28 still climbing massively faster compared to the climbrate data? Because the climb rate data is from sea level.
Could be that the documents you have show dry climbrate. In WarThunder the P-47D-28 has water injection.
They were late D model P-47s (If I remember correctly a D-30 was used in the test) so they would have water methanol injection as bog-standard at that point.
Yes, but that doesn’t change my statement. The tests you’re comparing to could’ve been done with dry power. It should be stated on the documents themselves.
Then what counts as standard ‘combat condition’ then? Because the test is written with the interpretation that you’d know what that means. Methanol injected? Or not? Because the horsepower figures the give in the sheet line up with water injection. Even still, if it was dry power. The P-47N’s engine only produces 2100 horsepower dry while the D-28 dry produces almost 2300. The climbrate of the P-47N would be logically much worse then.
I genuinely don’t know. I don’t know what documents you’re using for the P-47D-28, you’ve only shown one graph for the P-47N.
All I’m saying are hypotheses.
Also I don’t think you quite understood what I meant. The graph you show for the P-47N is very clearly with water injection (it says “war emergency” is 2800 horsepower at 2800 RPM, although from other images we can see this is just a simplification of the actual output, and the lines in your provided graph directly stating if they are using WEP or WEP for 5 minutes followed by normal power). I’m saying that the graphs you’re using for the P-47D might not be using water injection.
The initial chart in the OP shows the P-47D producing 2600 horsepower. Can the P-47D produce that amount dry?
For some reason I completely missed those two first images (stupidity on my end).
I don’t know exactly what power the P-47D can run without water injection, but to me it seems clear that it is running something weaker than it is actually capable of running.
This graph shows that at the highest power setting it generates 2800 horsepower at sea level, with water injection.
Edit: There’s two lines for water injection, one for 45.0’’ Hg and another for 70.0’’ Hg of pressure. Maybe the 2600 horsepower value on the other document is with the lower pressure water injection, as it seems to roughly line up to that 2600 horsepower value.
And the model in game we have produces 2700. If I remember correctly the D-28 did actually used to produce 2800. Why did gaijin dial it back?
