Aces High Bulletin Board
General Forums => Aircraft and Vehicles => Topic started by: Krusty on March 15, 2008, 05:23:38 PM
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I was working on a P-40E skin and noticed that the E-6b doesn't tie in to the actual boost settings on the P-40E.
[EDIT I double checked the numbers]
Full throttle is about 44" and 3000RPM, WEP is about 52" and 3000RPM, but the E6B lists the max power as 38" and 2800(?) RPM.
Is the e6b wrong or is the engine too powerful, or is the engine right but the dials are just calibrated wrong?
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*bump*
Anybody? :uhoh
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*Punt*
The smart people will answer.
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The E6B numbers refer to a specific alt which probably varies by plane. They won't (shouldn't) be consistant at all alts.
Regards,
Hammer
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P-40Es didn't have a WEP power setting. The V-1710-39 was rated at 1,150 HP at 46.2" at sea level.. BTW, I've mentioned this before.
Here's the Flight Operation Instruction Chart for the P-40E:
(http://home.att.net/~historyzone/P-40E-FOIC.jpg)
What we have is, essentially, a P-40K.
My regards,
Widewing
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Wow
Okay I did some checking and comparing afte reading WW's post.
Going off of
http://www.gonzoville.com/ahcharts/index.php?p1=p40e&p2=p40b
and
http://www.hitechcreations.com/ahhelp/models/p40e.html
and
http://home.att.net/~jbaugher1/p40_8.html
There are some strange questions that come up. Jbaugher's webpage usually has a nice reference or two, so I just used his first-off. There may be better resources out there. Anyways, his page says:
The P-40E was powered by one 1150 hp Allison V-1710-39 twelve-cylinder Vee liquid cooled engine. Maximum speed was 335 mph at 5000 feet, 345 mph at 10,000 feet, and 362 mph at 15,000 feet. Initial climb rate was 2100 feet per minute.
Comparing that to gonzo's and the AH planes webpage charts, this corresponds to the WEP speed charts, only the AH charts drop off too soon, never getting that fast (they stop at about 13.5k, not going up to 16k)
So, if a 1150hp Allison has about the same top speeds as we do, only without WEP, how are we reaching these speeds WITH WEP in-game?
Is it that the power is right, but the engine dials are simply mis-applied to show the wrong readings? I think this has happened at least once in the past.
On the other hand, the climb rate seems too high on WEP using the AH and Gonzo charts.
Did the max power rating of the P-40E have a 5 minute time limit? Or was it always on, sort of like the Yak9s we have in-game?
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Krusty,
I do not know of very many aircraft engines that you can run at max power continuously and expect there not to be damage done. People running around in game at max power continuously is just not reflective of real life, instead it is a game concession.
That said, there were some tests of R2800's run at max combat power for hours I believe. Check with Widewing, I believe he has that, it may also be in Graham White's Book.
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I realize that. AH2 makes some sort of concession on that part, I think. I think they use 30-minute continuous as "full throttle" most times, and cruise as "max continuous" or something similar.
So the question is, we've got the right performance specs (speed) but the boost is way too high. If you fix the boost (remove the WEP setting) the speed would slow down to be no better than the p-40b. Something is off in how AH2 has the P40s modeled, I don't know what though.
The P-40E seems to have too much power, but the specs are still "normal" despite that extra power. Some sort of hybrid performance, mixing P-40 types, I think.
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[EDIT I double checked the numbers]
Full throttle is about 44" and 3000RPM, WEP is about 52" and 3000RPM, but the E6B lists the max power as 38" and 2800(?) RPM.
You should have triple checked as you still got them wrong:
E6B:
"Military" (5mins) 44.6", 3000 rpm
"Normal", 38.5", 2600 rpm
(gauge readings are different though)
(http://img.photobucket.com/albums/v424/timppa/P40eng.jpg)
P-40Es didn't have a WEP power setting.
I guess HTC's definition of WEP is "5-10 mins power". By that definition P-40E did have WEP.
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Tim: I double checked the in-game MAP, forgot to check the E6B when I did that.
I assume that WEP is the same as takeoff? Seems several planes have similar TO/WEP ratings.
So here's the thing, though. If 5-min WEP is still only 45" or so, at that setting in-game, the P-40E performs no better than the P-40B.
So, even if you de-rated it to the historical settings (not counting 1-minute takeoff) it's too slow.
Look here:
http://www.gonzoville.com/ahcharts/index.php?p1=p40b&p2=p40e
The full throttle (no WEP) is 44 at 3000 RPM. In the chart that's the "no wep" speed chart. You see almost no change in speed, and a loss of climb.
The real deal was supposed to do ~360 TAS at 15k. At no-wep full-throt now, it won't even come close!
So, maybe we can get some more info here on the proper P-40E power and climb charts, and maybe then Pyro will correct it. Just looking at the WEP curve now shows the FTH is way lower (should be max speed at 15k on max power, shows as around 12-13k)
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Tim: I double checked the in-game MAP, forgot to check the E6B when I did that.
I assume that WEP is the same as takeoff? Seems several planes have similar TO/WEP ratings.
So here's the thing, though. If 5-min WEP is still only 45" or so, at that setting in-game, the P-40E performs no better than the P-40B.
So, even if you de-rated it to the historical settings (not counting 1-minute takeoff) it's too slow.
Look here:
http://www.gonzoville.com/ahcharts/index.php?p1=p40b&p2=p40e
The full throttle (no WEP) is 44 at 3000 RPM. In the chart that's the "no wep" speed chart. You see almost no change in speed, and a loss of climb.
The real deal was supposed to do ~360 TAS at 15k. At no-wep full-throt now, it won't even come close!
So, maybe we can get some more info here on the proper P-40E power and climb charts, and maybe then Pyro will correct it. Just looking at the WEP curve now shows the FTH is way lower (should be max speed at 15k on max power, shows as around 12-13k)
I would really like to see this. Then maybe we might see a whole bunch more P-40s in the air...
God I miss the days when I would enter a furball and see P-40s, Yaks, P-47s, C2s, P-38s, Ki61s... "Variety: You dont know what you've got 'till its gone."
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*Punt*
The smart people will answer.
:rofl :rofl :rofl :rofl