DarrenW
Staff Sergeant
Cast your vote: Best US escort fighter in ETO during 1943?
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My head is now hurting. Can someone tell me any area of performance that the latest P-39 was superior to the Spitfire IX or XIV, P-51-B/C, P47 and F4U as of 25 December 1943?[/QUOTE]
1. Spitfire IX: That would be the LF Mk.IX with the Merlin 66 using +18 lbs./sq. in. boost.
2. Spitfire XIV: Not Applicable. It did not fly its first operational sortie until 28 December.
3. P-51B: That would be the P-51B-1 with the Packard (Merlin) V-1650-3 using +67" Hg.
4. P-47D: That would be the P-47D-2-something(help me here people) using water injection.
at 56"Hg. producing 2,300 hp./T.O.
5. F4U-1a: This would be without water injection. That came along in 1944.
Then someone mentioned the P-38J/L. Well that would be number 6.
6. P-38J-5: Not Applicable. First operational sortie was on 28 December 1943.
1. The P-39N was faster than the Spit 9 up to about 5,200 meters. It was generally
consider a more rugged aircraft (In more opinions than just mine). I'm old and
don't have much time left so you look it up. It definitely had the better ground
attack fire power. I do not have the rate of roll figures for the P-39N, but the D-1
was out-rolled by the Spitfire up until 355 mph.
3. The P-51B-1: It would be ludicrous to believe the P-39N could match the
Mustang's speed but it actually compared reasonably at lower levels. At
2,000 m. there speeds were 394 vs. 381 mph. 3,000 m.= 406 vs. 398 mph.
Climb rate and overall maneuverability went to the Airacobra at low-medium
altitudes. Sea level climb= 3,187 vs. 4,140 fpm., 4,000 m.=3,437 vs. 3,620 fpm.
The P-51B-1 was not able to climb with the P-39N until almost 6,000 m.
4. P-47D-22: Does anyone really need me to post the climb rate figures here?
Well, Just for fun let's use the D-10 tests with the new Curtiss 836-RC2-18
paddle-blade propeller. It managed 3,580 fpm. S.L. and 3,300 fpm./4,000 m.
This test aircraft could actually match the Airacobra at 4,500 m. It must be
kept in mind that this was a test vehicle and the actual operational Thunderbolts
climbed about 400 fpm. slower. Low and medium altitude maneuverability
go to the Airacobra. Speed?,. Sea Level: 39/47= 344/337mph., 4,000 m.= 388/394.
5. F4U-1a: Sea level climb: 3,160 fpm., 4,000m.= 2,410 fpm. The P-39N held the
advantage all the way to their service ceiling. Maneuverability: The F4U had
an early advantage in acceleration into the roll over the P-39N if it was carrying
its wing guns. Not so much against the Russian aircraft without them. The
airacobra pretty much held the edge everywhere else, at least at low and
medium altitudes.
Alright guys,
Before you all start trying to dance all over my head. Look closely at exactly the
information I have posted. I agree that every other aircraft listed here is more
versatile. I also agree that every other aircraft here was much better suited to
the utilization that they were designated. BUT for the use that the Russians
needed fighter aircraft for, the P-39N in 1943 was the best choice (in my little mind).
Its my belief that the State department did have a ban on the F engines which is why we had to have the C. Having been forced to have the C we may as well have the same engine as the P40 which is why they weren't handed. Interestingly the tests agreed that having non handed engines wasn't a problem.If there was a ban it disappeared somewhere between March of 1940 when the British order 143 model 322s without the turbo superchargers and June 5th of 1940 when they order 524 Lighting MK 2s with Turbo Superchargers.
Mighty short lived if it existed.
A great post Corsning, but at the end of 1943 what were the requirements in Europe?Well, before I get some sort of momentum going, I would like to go on record as saying,
"P-39 Expert, please get off the whole P-39 would have been a good escort fighter at
20,000 ft. in the ETO or anywhere else. It just would not have happened.
There were too many other aircraft in the works that could do that mission
so much better. Concentrate on where the P-39 really shined like the
Russians did."
1. Spitfire IX: That would be the LF Mk.IX with the Merlin 66 using +18 lbs./sq. in. boost.
2. Spitfire XIV: Not Applicable. It did not fly its first operational sortie until 28 December.
3. P-51B: That would be the P-51B-1 with the Packard (Merlin) V-1650-3 using +67" Hg.
4. P-47D: That would be the P-47D-2-something(help me here people) using water injection.
at 56"Hg. producing 2,300 hp./T.O.
5. F4U-1a: This would be without water injection. That came along in 1944.
Then someone mentioned the P-38J/L. Well that would be number 6.
6. P-38J-5: Not Applicable. First operational sortie was on 28 December 1943.
1. The P-39N was faster than the Spit 9 up to about 5,200 meters. It was generally
consider a more rugged aircraft (In more opinions than just mine). I'm old and
don't have much time left so you look it up. It definitely had the better ground
attack fire power. I do not have the rate of roll figures for the P-39N, but the D-1
was out-rolled by the Spitfire up until 355 mph.
3. The P-51B-1: It would be ludicrous to believe the P-39N could match the
Mustang's speed but it actually compared reasonably at lower levels. At
2,000 m. there speeds were 394 vs. 381 mph. 3,000 m.= 406 vs. 398 mph.
Climb rate and overall maneuverability went to the Airacobra at low-medium
altitudes. Sea level climb= 3,187 vs. 4,140 fpm., 4,000 m.=3,437 vs. 3,620 fpm.
The P-51B-1 was not able to climb with the P-39N until almost 6,000 m.
4. P-47D-22: Does anyone really need me to post the climb rate figures here?
Well, Just for fun let's use the D-10 tests with the new Curtiss 836-RC2-18
paddle-blade propeller. It managed 3,580 fpm. S.L. and 3,300 fpm./4,000 m.
This test aircraft could actually match the Airacobra at 4,500 m. It must be
kept in mind that this was a test vehicle and the actual operational Thunderbolts
climbed about 400 fpm. slower. Low and medium altitude maneuverability
go to the Airacobra. Speed?,. Sea Level: 39/47= 344/337mph., 4,000 m.= 388/394.
5. F4U-1a: Sea level climb: 3,160 fpm., 4,000m.= 2,410 fpm. The P-39N held the
advantage all the way to their service ceiling. Maneuverability: The F4U had
an early advantage in acceleration into the roll over the P-39N if it was carrying
its wing guns. Not so much against the Russian aircraft without them. The
airacobra pretty much held the edge everywhere else, at least at low and
medium altitudes.
Alright guys,
Before you all start trying to dance all over my head. Look closely at exactly the
information I have posted. I agree that every other aircraft listed here is more
versatile. I also agree that every other aircraft here was much better suited to
the utilization that they were designated. BUT for the use that the Russians
needed fighter aircraft for, the P-39N in 1943 was the best choice.
A great post Corsning, but at the end of 1943 what were the requirements in Europe?
1 long range at high altitude.
2 shorter range recon, ground attack, low level escort and air superiority missions.
In the far east almost all missions required range and carrier capability was a price worth paying.
If you are crossing the Channel in a P-39, what do you do about an Bf109 at 10,000ft? the higher you go the more you are in his territory and he can climb too, the lower you go the more you concede and the closer you are to enemy flak in the place the everyone was trying to convince Adolf that a landing would take place.
Paragraph 2, The British read the glossy hype? British know that the prototype P-39s only weighed around 6000# and they also knew that their P-400s would weigh more since they specified EVERY piece of equipment in their contract. This was absolutely no surprise to the British.
Paragraph #3, in 1940 the British (and French) WERE absolutely desperate for aircraft, but in no way did they believe for one second that any P-39 with the 1150HP engine would do 400mph, especially at 7850# after installation of the armor plate/glass and self sealing tanks that were REQUIRED BY THE BRITISH.
Paragraph 5, note the distinction between Lend Lease planes and Direct Purchase (contracted) planes. The British were paying CASH for the contracted planes. But now free lend lease planes were available. What would you do if you were the British? Well you would do your best to get out of the CONTRACT and get the free lend lease planes.
1. Spitfire IX: That would be the LF Mk.IX with the Merlin 66 using +18 lbs./sq. in. boost.
2. Spitfire XIV: Not Applicable. It did not fly its first operational sortie until 28 December.
3. P-51B: That would be the P-51B-1 with the Packard (Merlin) V-1650-3 using +67" Hg.
4. P-47D: That would be the P-47D-2-something(help me here people) using water injection.
at 56"Hg. producing 2,300 hp./T.O.
5. F4U-1a: This would be without water injection. That came along in 1944.
Then someone mentioned the P-38J/L. Well that would be number 6.
6. P-38J-5: Not Applicable. First operational sortie was on 28 December 1943.
The loss of time line and how fast things were changing in 1943 is almost laughable. The first six Griffon Spitfires with 60 series engines were tested by Geoffrey Quill on 20 January !943 called Mk VIIIGs. That is a month after our P-39N entered production in USALucky for the P-39 variant that it did not have to compete with the Spitfire XIV and P-38J-5 because they would not fly operational sorties for 3 days!
Possibly, those aircraft were in squadron service and ready to go on operations at December 25, 1943.
We really do need to see this historic RAF/Bell contract.
Anyone have info on the British pilot Christopher Clarkson, who "evaluated" the P-39 in the USA (December 1940?) prior to delivery to the UK?
His impressions/reports?
In the Soviet Union in 1941-43 there was a real lack of high altitude engines and not from want of trying or desire (they tried turbo-charging everything short of the diesel engine from the T-34 tank) and the two most common fighter engines. The VK-105 and the ASh-82 just weren't very good for several reasons. Getting 1150hp at 12,000ft was beyond the reach of the VK-105 and 1125hp at 15,500 was a miracle.
For instance the VK-105PA was rated at 1100hp at 6500ft(2000m) and 1050hp at 13200ft (4000M) and when they went to the VK-105PF power went to 1260hp at 2300ft (700m) in low gear and 1180hp at 8900ft (2300M) above 13200ft the performace was the same?
Please note that when pressure in later in engines was increased they went from 1050mm to 1100mm which is about 2in of increased presure or about 1lb.
The ASh-82F had 1300hp at 17,700ft (5400M) but the radial engine has more drag. The ASh-82FN had 1460hp at 15250(4650m) The Russians constantly worked at reducing drag.
The only Russian built aircraft with more high altitude performance was the Mig-3 and they were out of production. The P-39 could slide right on in as a medium altitude fighter in Russia.
Sorry Sir, I was just trying to make a distinction for my reply. I lowered my voice and will take a time-outCornsing, do you have to use bold text?
"4. P-47D: That would be the P-47D-2-something(help me here people) using water injection.
at 56"Hg. producing 2,300 hp./T.O.
5. F4U-1a: This would be without water injection. That came along in 1944."
Just to add more to this:
According to America's Hundred Thousand, Republic Aviation began fitting water injection systems on all P-47D-20RE models in November 1943 and by the end of the year most ADI modifications were complete on older aircraft stationed in England. It also states that on November 25th of the same year the 1,551st F4U-1A built by Vought became the first Corsair equipped with WEP from the factory.
I was comparing "Operational" fighters.
.There has been some discussion about how different in performance were the P-39Q and N. They did differ in armament, the two .30 cal. machine guns in each wing being replaced by a .50 cal. mounted in lower-wing gun pods. I checked wind tunnel testing concerning the extra drag of these gun pods in NACA report L5A30 to verify. NACA concluded that the CD of the airplane (in this case, a P-63) was increased by 0.0010, which amounted to a -6 mph change in level speed. So if we add 6 mph to the speed of a P-39Q we will pretty much have the speed of an average P-39N. But then again, those four missing .30 cal. machine guns had to reduce drag slightly as well. So the addition of 4-5 mph is a reasonable amount to add, but never more IMHO.