Aces High Bulletin Board
General Forums => Aces High General Discussion => Topic started by: Ack-Ack on July 01, 2005, 12:28:16 AM
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P-38J
crew: 1
wingspan: 52' 0"
length: 37' 10"
height 12' 10"
wing area: 328 sq ft
powerplant: 2 x Allison V-1710-89/91 Vee-12 liquid-cooled engines
max speed: 420 mph at 26,500 ft
weight, empty: 12,780 lbs
weight, loaded: 17,500 lbs
weight, max: 21,600 lbs
service ceiling: 44,000 ft
armament: One 20mm cannon /w 150 r. four 0.50 cal mgs /w 500 rpg
# built: 2970
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P-38L/M*
crew: 1
wingspan: 52' 0"
length: 37' 10"
height 12' 10"
wing area: 328 sq ft
powerplant: 2 x Allison V-1710-111/113 Vee-12 liquid-cooled engines
max speed: 414 mph at 25,000 ft
weight, empty: 14,100 lbs
weight, max: 22,000 lbs
service ceiling: 44,000 ft
armament: One 20mm cannon /w 150 r. four 0.50 cal mgs /w 500 rpg
# built: 3923
Told you so. And as you can see, it's the lighter weight of the J that gives it the marginal speed over the L, despite the newer and better Allisons the L had. Now does this translate to an advantage for the J? I guess in a level chase, the J would eventually catch up if both planes stay on a level plane. Other than that, I can see no real advantage of 6mph.
ack-ack
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would the 1500ft difference in alt make a 6mph difference in speed as well?
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In a lvl chase they would both be on the same lvl... the max speed of the J is at higher altitude though.
Also i heard the J had less drag due to the diffrent engine cowlings, is that true?
If so then i would guess most of the speed advantage comes from the reduced drag?
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Which one has the highest deck speed?
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p38 j 200ft no wep 332mph in ah2.......................... .p38l 200ft no wep 333mph ah2.
Both had 50% fuel
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Weight has nothing to do with maximum speed. If you dont believe me, take any plane up with 100% fuel and then 25% fuel.
Balsy
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That would be in Aces High 2?... which surprises me.
More weight means more drag due to higher AOA thus lower speed.
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Im no aeronautical engineer but.. .in level flight/maximum speed isnt the AOA the same?
If I take a 727 up to 20K empty, will it fly faster at level flight than a full one?
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i was just at the bong memorial in superior wisconsin(about 15 miles frome his home town of Poplar WI.)and the info there said that the 38L had a top speed of 414 and the 38J i cant remember the exact number but its top speed was around 385 (http://[IMG]http://img.photobucket.com/albums/v347/jongl/bong1657.jpg)[/IMG] (http://[IMG]http://img.photobucket.com/albums/v347/jongl/bong1648.jpg)[/IMG]
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Keep in mind AOA / coefficient of lift is not only dependent on weight but also changes with the square of velocity. Increasing velocity means reduced AOA.
For max level speeds the change in AOA and resulting induced drag due to a change in weight are very small. The impact on max level speeds would be imperceptible unless you're comparing speeds stabilized over a long duration.
For example a Beech Bonanza E33A with a max level speed of about 215 mph, the impact due to weight is about 1 mph per 100 lbs of weight.
Tango, XO
412th FS Braunco Mustangs
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My only concern is, which one can I live the longest in?
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Thanks Rod, could have done the test my self but was too lazy, appriciate it :)
Slimm, as for your only concern... the J I'd say.
Deck speed is the most important speed for any plane in AH. The J acording to Rod367th's test is only 1 mph slower at the deck compared to the L and it turns quite a bit better then the L.
The J is most likely the one you can live longest in. BUT it performs worse in high speeds and it doesn't have dive flaps.
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Originally posted by Wilbus
...and it doesn't have dive flaps.
Heh, that's ok. I gave up long ago trying to get higher than everyone else. There was always someone higher than me. So I play below 4K agl, usually.
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25k no wep p38J 400mph 25k p38L no wep 401 mph
what i found out is j climbs faster and can pull out vertical dive from 25 to 4k hit x and st8 and true flying L model crashed same test.
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i was just at the bong memorial in superior wisconsin(about 15 miles frome his home town of Poplar WI.)and the info there said that the 38L had a top speed of 414 and the 38J i cant remember the exact number but its top speed was around 385 [IMG]
alot of ppl seem to forget that each plane made in a series is different, depending on the mechanic, and how well he tuned it, how well each part was machined, rivet job, time of year, tempurature, ectra.
the japanese planes had a wide area of performance because they were thrown together so fast and ran on such bad fuel.
i bet some day one of the ubber real sims will have a randomizer that will give each model of plane a unique tuning range.
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Originally posted by slimm50
My only concern is, which one can I live the longest in?
you should change your question to:
My only question is, which one can I kill the most in?
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A 6 mph difference is statistically irrelevent. You could fly two identical models and one could be 6 mph faster than the other on any given day. 6 mph out of 420 mph is 1.4 percent.
They are published test speeds from somewhere, and just as easily the J was flown with a slighlty better engine that day, or a polished leading edge, or who knows what, maybe the bird crap on the nose wasnt polished off properly.
Any diff under 10 mph isnt even worth discussing really, despite the endless threads on plane X and plane Y.
My guess would be either a P-38J-25 or a P-38L-5 could do @ 410-420 mph tops in good shape, clean, with a pilot that made no mistakes.