Author Topic: High Altitude woes for the Luftwaffe  (Read 5181 times)

Offline AquaShrimp

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High Altitude woes for the Luftwaffe
« Reply #30 on: April 20, 2007, 05:40:26 PM »
I was watching "Wings" one day, and a P-51D pilot was talking about BF-109s being way above them (30,000+) as they were escorting bombers.  He said these were special high-alt equipped 109s, and that they had much better performance than the P-51s at such altitudes.

Any idea to what type of BF-109 he was referring to?

Offline Captain Virgil Hilts

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High Altitude woes for the Luftwaffe
« Reply #31 on: April 20, 2007, 05:53:51 PM »
Quote
Originally posted by Squire
Disagree with the premise.

You are talking as if the Air War didnt develop at all.

Allied fighters will start out with no P-51, only P-38s and P-47s. They have fuel issues as well, where defending fighters can last longer at full power on the defensive near friendly bases.

The LW does get later varients of the 109 and 190 as the war progresses, 109D-9, 109G-14 and 109K-4 all come into service vs the P-51s summer-fall, 1944.

Bomber alts will be between 18k-25k I would think, depending, not always at 25k.

I see it as a rather balanced field actually. Both sets are competative, you can argue the fine points (and they have been argued over for decades) but the bottom line is that no one side will have super-duper a/c vs POS a/c on the other.

...so relax. :aok


Only the P-47 has fuel issues, the P-38 has PLENTY of range, as it has good fuel efficiency and plenty of drop tanks. The ONLY reason the P-38's ever suffered from a lack of range is because the pilots were not taught proper fuel management, and were wasting fuel and blowing engines until Lockheed sent Tony Levier to show them what was wrong. After proper instruction, guys who had been coming back with a tea cups of fuel left were coming back with a hundred gallons. It has been said that a lot of P-38's may have been lost because they hung around and fought when the pilots figured out they were going to have to ditch and be captured anyway.
"I haven't seen Berlin yet, from the ground or the air, and I plan on doing both, BEFORE the war is over."

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Offline Squire

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High Altitude woes for the Luftwaffe
« Reply #32 on: April 20, 2007, 06:10:22 PM »
Bomber streams rtb, escort fighter groups rtb, no a/c had enough gas to fly at full power forever.

...even P-38s had to rtb at some point. Either fuel or tactical issues that come up.

My point is that defending fighter always have a "home court" advantage as they are over firendly territory, much nearer bases they can land at short of fuel, or battle damaged, or both.

And I will point out that max ranges are based on optimum cruise settings, not combat. Fuel is always a concern, even for "long range" fighters.
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Offline Widewing

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High Altitude woes for the Luftwaffe
« Reply #33 on: April 20, 2007, 06:34:16 PM »
Quote
Originally posted by Squire
Disagree with the premise.

You are talking as if the Air War didnt develop at all.

Allied fighters will start out with no P-51, only P-38s and P-47s. They have fuel issues as well, where defending fighters can last longer at full power on the defensive near friendly bases.

The LW does get later varients of the 109 and 190 as the war progresses, 109D-9, 109G-14 and 109K-4 all come into service vs the P-51s summer-fall, 1944.

I see it as a rather balanced field actually. Both sets are competative, you can argue the fine points (and they have been argued over for decades) but the bottom line is that no one side will have super-duper a/c vs POS a/c on the other.

...so relax. :aok


It isn't a premise, nor a theory or even an opinion.

Don't believe me? Tell ya what, I'll fly any US fighter of 1943 vintage; P-38J, P-47D-11 or P-51B. You take a Dora or a 109G-14. We can take off from field A3 of the TA map (30k base). We can then play a bit.... You will be horrified at the beating the Dora will take.

Then you should consider how the 109G-6 or 190A-8 will do.

My regards,

Widewing
My regards,

Widewing

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Offline Captain Virgil Hilts

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High Altitude woes for the Luftwaffe
« Reply #34 on: April 20, 2007, 06:38:19 PM »
You don't fly a mission at 100% military power. A mission profile has power settings and time frames calculated. In the beginning, a mission profile had about 5 minutes of WEP figured in, because they weren't getting the range they should have.

You are correct, the Luftwaffe will have the home field advantage. As they should.

However, I doubt fuel will be the consideration you would assume.
"I haven't seen Berlin yet, from the ground or the air, and I plan on doing both, BEFORE the war is over."

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Offline zorstorer

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High Altitude woes for the Luftwaffe
« Reply #35 on: April 20, 2007, 06:46:15 PM »
As long as the bombers fly at cruise and not 100% power I will be happy.  :D

BoB shows how fun it is chasing bombers around at 100% power ;)

Offline Viking

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« Reply #36 on: April 20, 2007, 07:08:11 PM »
Quote
Originally posted by Widewing
No, the Bf 109K-4 does not outperform the P-47N at 25k.

Model: Speed / Climb

At 25k
P-47N: 457 mph / 3,020 fpm
109K-4: 445 mph / 2,870 fpm

At 30k
P-47N: 475 mph / 2,490 fpm
109K-4: 430 mph / 1,980 fpm

You have to got down to 23.5k to have roughly equal performance. At 22k, the 109 is faster, but that's very close to its FTH.

At 22k
P-47N: 446 mph
109K-4: 451 mph

If HTC goes for realism, the Americans and Brits will have 150 octane avgas in the early autumn of 1944.

My regards,

Widewing



According to GonZo’s fighter comparisons (I believe you have contributed with some data):






Unlike the numbers you now present you can see that the 109K out climbs the P-47N at all altitudes, and are equal or very close to equal in speed at 25k.

Offline Viking

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« Reply #37 on: April 20, 2007, 07:26:25 PM »
Seems to me you have accidentally switched the climb numbers.

Offline Widewing

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« Reply #38 on: April 20, 2007, 07:55:28 PM »
Quote
Originally posted by Viking
According to GonZo’s fighter comparisons (I believe you have contributed with some data)

Unlike the numbers you now present you can see that the 109K out climbs the P-47N at all altitudes, and are equal or very close to equal in speed at 25k.


He doesn't use actual test data for some aircraft. He uses the HTC charts for the P-47N, which reflect max takeoff weight.

I used 267 rounds per gun (standard USAAF ammo load) for the P-47N.

The charted numbers for the 109K-4 reflect 25% fuel. I tested using 30 minutes of fuel. I take off, adjust fuel burn to burn quickly down to 30 minutes endurance at max power, then set burn to zero. 25% fuel provides exactly 30 minutes duration for the P-47N (based upon E6B at a burn rate of 1.0). The 109K-4 requires about 40% fuel to fly 30 minutes at max power (E6B).

One can argue that the Allied fighters will be carrying considerably more than this in CT. However, as a basis for equal testing, 30 minutes is sound.

In addition, I tested acceleration from 200 mph IAS to 250 mph IAS (329 mph TAS to 410 mph TAS) at 25k and 30k.

I record time required to accelerate from 200 IAS to 250 IAS.

At 25K
P-47N: 42.22 seconds
109K-4: 46.94 seconds

At 30k
P-47N: 1:02.32
109K-4: 2:01.34

At 30k, the P-47N runs away from the 109K like the Messerschmitt was tied to a tree.

My regards,

Widewing
My regards,

Widewing

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Offline bj229r

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High Altitude woes for the Luftwaffe
« Reply #39 on: April 20, 2007, 08:04:07 PM »
never mess with Widewing:cry
Never underestimate the power of stupid people in large numbers

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Offline Toad

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High Altitude woes for the Luftwaffe
« Reply #40 on: April 20, 2007, 08:14:49 PM »
303rd Bomb Group Mission Reports

Actual mission reports from the 303rd Bomb Group, B-17's.

I think if you check you'll find most bombing done from the mid-20's and higher, on up to 29K.

Not that many in the low 20's, usually the shorter ones to St. Nazaire and the like. The farther the target, the more likely to be above 25K.

364 mission reports; enjoy.


It would seem if that if you want to emulate the real thing in TOD, these mission reports would be a fine reference for planning.
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Offline Wmaker

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High Altitude woes for the Luftwaffe
« Reply #41 on: April 20, 2007, 08:18:58 PM »
http://www.llv32.org/filmit/WWWM1.ahf
http://www.llv32.org/filmit/WWWM2.ahf

Here are the films of the engagements...there are two things that are strikingly evident...WideWing is an excellent pilot and I had had fifteen (15) beers. :)

So it is painfully obvious that the 109 can be flown A LOT better than I did. As anyone can see I didn't use the flaps at places where I should have used them.

Just, one more comment, kweassa is 100% correct on the fact that 109s became better with the last flight modelling change and quite frankly I don't think that 109s turn too slow but the opposing fighters turn too well IMO. It is all down to the modelling of the lift coefficient when using flaps IMO.

I'll try to read this thread tomorrow (today :)) and then comment further.
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Offline Viking

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« Reply #42 on: April 20, 2007, 08:26:35 PM »
Quote
Originally posted by Widewing
One can argue that the Allied fighters will be carrying considerably more than this in CT. However, as a basis for equal testing, 30 minutes is sound.
 


That’s a fallacy my friend as the purpose of these threads of yours is to test the actual environment we will be playing in CT. The Allied fighters should be tested at 75%  fuel or more (most allied fighters were still flying on drop tanks over Germany), and the LW at 50% without drop tanks, and 75% or more if drop tanks have been used.

Another factor you’ve not taken into consideration is the 109K’s superiority at MIL power, and the 109 has twice the P-47’s WEP. At MIL power the 109 is faster than the 47N at 30K.
« Last Edit: April 20, 2007, 08:28:45 PM by Viking »

Offline Widewing

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« Reply #43 on: April 21, 2007, 01:17:43 AM »
Quote
Originally posted by Viking
That’s a fallacy my friend as the purpose of these threads of yours is to test the actual environment we will be playing in CT. The Allied fighters should be tested at 75%  fuel or more (most allied fighters were still flying on drop tanks over Germany), and the LW at 50% without drop tanks, and 75% or more if drop tanks have been used.

Another factor you’ve not taken into consideration is the 109K’s superiority at MIL power, and the 109 has twice the P-47’s WEP. At MIL power the 109 is faster than the 47N at 30K.


You stated, "If the ETO gets to 1945 the LW will have the 109K which outperforms the P-47N in all regimes of flight at and below 25k."

I responded by posting data that showed that this was untrue. I compared max performance based and eliminated a variable, thus establishing greater accuracy.

Had P-47Ns been deployed to the ETO, they could have flown from Britain to Berlin WITHOUT drop tanks and still have a 45 minute reserve. Being a 1945 fighter, they would have been based in eastern France or Belgium. Thus, they would rarely fly with more than 350 gallons (full internal fuel is 556 gallons). Therefore, I would argue that you would likely never encounter a P-47N with more than 50% fuel. Indeed, the P-47N could fly 1,700 miles on internal fuel, including warm-up, climb-out to 25k, cruise to target, 5 minutes in WEP, 15 minutes at MIL power, cruise back and still have 30 minutes of reserve fuel. It could fly over 400 miles on 25% fuel, or from Berlin to Manston. So, you could certainly encounter a P-47N over Germany with much less than 50% fuel.

As to speed, you are incorrect. The P-47N can attain 434 mph in MIL power at 30k. That's faster than the 109K can manage in WEP. At MIL power, the 109K can do 421 mph at 30k. Test both yourself, I have no corner on the testing market. Anyone with the software can confirm my data.

Oh, by the way, the P-47D-40 is also faster than the 109K using just MIL power (431 mph) and faster yet in WEP (436 mph) and with 50% fuel is its equal in climb rate up there. All of the P-47s are faster than the 109K at 30k.

If you wish, come to the TA one evening and we can compare the two in combat. You may be shocked to discover that the P-47D-40 actually has a smaller turn radius at 30k than the 109K (about dead equal to the 109G-6). Up that high, the 109K has no advantage in climb and is slightly slower. It falls way behind in acceleration as well. Plus, the P-47s can start getting flaps out at 400 mph.

Within the context of Combat Tour, I hope that the mission generator air spawns the Luftwaffe fighters high enough to allow them a reasonable chance to carry some speed into the fight. While the 109K-4 is reasonably competitive with the Allied fighters, the Dora is at best marginal (410 mph @ 30k, with a climb rate of just 1,050 fpm) and the rest of the 109s and 190s are outclassed in terms of speed. Without some altitude to trade for speed, the lesser fighters will be bounced continuously.

If you watched Wmaker's films, you saw that the P-47D was much faster than the 109G-6. To the extent that I could have simply BnZ'd the 109 all day. But, it was far more fun to follow the 109 down and mix it up. The Jug lost equality down low when it ran out of WEP.

Another interesting thing about combat at 25k to 30k is that a turn radius that measures 700 feet at sea level, exceeds 2,000 feet up high. Thus, you will not see the close dogfights you see on the deck. Up high, excess power is what ultimately determines agility.

My regards,

Widewing
« Last Edit: April 21, 2007, 01:20:27 AM by Widewing »
My regards,

Widewing

YGBSM. Retired Member of Aces High Trainer Corps, Past President of the DFC, retired from flying as Tredlite.

Offline straffo

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High Altitude woes for the Luftwaffe
« Reply #44 on: April 21, 2007, 02:33:07 AM »
Quote
Originally posted by Krusty
Straffo, have you seen the targets for CT? They posted screenshots. Miles and miles of city, including residential and industrial areas. The point is carpet bombing, from hundreds of bombers all at once. That means you need a target large enough to carpet bomb! The objective will be a % of the total target (i.e. "You need to bomb 60% for a win")


Well I expect the bomber briefing to be not like :

- bomb within 10km of the powerplant area.
or :)
- bomb germany.

Don't forget IRL the bomber where not precise ,I hope they won't use laser bombs in CT !