Spitfire XIV vs Bf-109 K-4 vs La-7 vs Yak-3
- Thread starter Soren
- Start date
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kool kitty89
Senior Master Sergeant
Soren I think you need to be specific on which part Bill was wrong about.
And Bill, Soren already admitted that he was wrong about the aeroelastic effects being an intentional design feature, though they did occur in the way he described.
And mentioned earlier was that the 23000 series airfoil itself (without washout) generated an elliptical lift distribution, without an elliptical (or elliptical-like) planform
And one final thing, though the stalling occurring in high G turns is a disadvantage, the elliptical lift (and thus low induced drag) would benefit turn performance.
And Bill, Soren already admitted that he was wrong about the aeroelastic effects being an intentional design feature, though they did occur in the way he described.
And mentioned earlier was that the 23000 series airfoil itself (without washout) generated an elliptical lift distribution, without an elliptical (or elliptical-like) planform
And one final thing, though the stalling occurring in high G turns is a disadvantage, the elliptical lift (and thus low induced drag) would benefit turn performance.
drgondog
Major
Explain
1. Aeroelasticity - How would you model an airframe system to yield analytical results
2. How you believe that the designers of the Fw 190 understood aeroelasticity and used that knowledge in their designs
3. How the analytical results from any approach in airframe design used during WWII were close toactual results under loads.
kool kitty89
Senior Master Sergeant
Bill Soren already admitted he was wrong about that being an intentional design feature.
plus from the original email post:
On another note, the comments Spitfire seem to say that (while similar in comparing all in the optimum conditions) it's wing would be the most efficient over a wide range of operation.
plus from the original email post:
On another note, the comments Spitfire seem to say that (while similar in comparing all in the optimum conditions) it's wing would be the most efficient over a wide range of operation.
drgondog
Major
Having lower induced drag is all about more efficiency of the wing, not much to do with respect to turn performance but all things equal I would prefere lower induced drag -------> implying slightly better energy retention between the two aircraft (less 'pull' against the thrust).
The stalling characteristics between the Fw 190 were more severe than a Mustang in the same high G turning manuever. Both had 'square' wing tips, Both had twist up to 81.% but the Fw 190 stopped the twist at that point, preferring to reduce the induced drag slightly from a comparable wing which twisted all the way out... which would be fine for straight line flight efficiency.
The Mustang gave plenty of warning (until full fuse tank screwed up stability) as the stall progressed from inboard to tip.
It (Fw 190) probably would have not had the severe snap stall in high G turn if the wing was perfectly rigid and that for a 'rigid - non torsioning' tip area, would have stalled more conventionally.. namely stalling from inboard out all the way, with tip area reaching stall after some decent buffeting of the tail due to the first losses in the root area?
Does that make sense?
what a funny discussion!
so, let's talk numbers: i got the stats for the spit14 and i think kurfust has the stats for the k-4 somewhere, so let's compare how much planes were build , how much declassed and how much didn't saw action and will see what the better plane is!
Just a little explaination:
operationnal means assigned to squadron, what does NOT mean combat-operationnal! The plane was simply assigned to a squad, nothing else!
SoC or Struck of charge : numbers only counted until june45!
Production and active duty43 (tried another view in exell)
the same for 44:
and for 45:
So, only by numbers, i will say the k-4 is much better than the spit: there were simply more of them, and as everyone knows, quantity beats quality, look at the 262 case if you don't trust me
the spit14 has less influence on ww2 airbattles than the he-162 in my eyes!
Now, let's continu the bashing!...
so, let's talk numbers: i got the stats for the spit14 and i think kurfust has the stats for the k-4 somewhere, so let's compare how much planes were build , how much declassed and how much didn't saw action and will see what the better plane is!
Just a little explaination:
operationnal means assigned to squadron, what does NOT mean combat-operationnal! The plane was simply assigned to a squad, nothing else!
SoC or Struck of charge : numbers only counted until june45!
Production and active duty43 (tried another view in exell)
the same for 44:
and for 45:
So, only by numbers, i will say the k-4 is much better than the spit: there were simply more of them, and as everyone knows, quantity beats quality, look at the 262 case if you don't trust me
the spit14 has less influence on ww2 airbattles than the he-162 in my eyes!
Now, let's continu the bashing!...
kool kitty89
Senior Master Sergeant
OK, Bill but what part do you still disagree with Soren about?
Kurfürst
Staff Sergeant
Excellent graphs bada. I can confirm that bada`s strenght figures for Spitfire XIVs agree well with known number of XIVs reported in service at given dates.
Its also worth remembering that not all aircraft assigned to an RAF fighter squadron flew operational sorties; British practice was to use 20-22 plane strenght squadron establishments, of which however a maximum of 12 planes would fly operational sorties; the remaining aircraft was assigned to the Squadron as reserve aircraft.
For comparison, the 109K strenght assigned to first-line units was a steady 200 in October, November and December 1944, rising to 314 by end of January 1945; no further strenght data is available unfortunately, but its worth remembering that the production of other Bf 109 subtypes practically ceased by that time in favour of the DB 605D powered G-10 and K-4.
Its also worth remembering that not all aircraft assigned to an RAF fighter squadron flew operational sorties; British practice was to use 20-22 plane strenght squadron establishments, of which however a maximum of 12 planes would fly operational sorties; the remaining aircraft was assigned to the Squadron as reserve aircraft.
For comparison, the 109K strenght assigned to first-line units was a steady 200 in October, November and December 1944, rising to 314 by end of January 1945; no further strenght data is available unfortunately, but its worth remembering that the production of other Bf 109 subtypes practically ceased by that time in favour of the DB 605D powered G-10 and K-4.
drgondog
Major
1. His misquotes of what I said as I have noted above
2. His use of my explanations to him (Soren) to try to expand what he said to Gene as if he was the author of the thought
Notably in my last two comments in response to this one this morning.
From Soren
Bill I posted the entire mail in its original form, and all I wrote is there in the exact original context!
So stop believing I'm trying fool anyone here man! Go contact Gene for crying out loud!
For the record - I agree everything Gene said.
Soren misquoted his original comments that started this long running debate to Gene - he pulled out the original context 'of designing elliptical distribution' for a high G turn and inserted mine regarding 'aeroelastic effects combined with the tip design' were the causes of the stall.
I think I have laid out the specifics in my last three posts on this subject.
Soren has not admitted to either the 'ommissions' or the 'commisions', from his statements and my rebuttals ,in his email to Gene.
He re-wrote his statements to include my corrections and posed them as his own thoughts.
Further - he is not responding to the three simple questions I asked him about Aeroelasticity... dispite his vast knowledge of the subject before this debate.
That about sums it up.
drgondog
Major
I think I will take a nap... but I think I want the Spit XIV depending on the mission.
claidemore
Senior Airman
Hi Bada,
Actual production of the Mk XIV Spitfire was 957, not 482. Not sure what your sources are for those figures, but they are a bit low. I have seen figures ranging from 700+ to 1500 for the K4.
Be that as it may, your graphs show an interesting trend. Nearly half of available Mk XIVs were usually non-operational, because, as pointed out by "glen" in a previous post, they simply weren't needed. The ones who were operational had a hard time finding anything to fight as it was. Too much competition from Mustangs, Tempests, Typhoons, P47s, P38s and Spit IXs.
The graphs show a peak of MkXIV use about the time the allies "knew" they would win the war, so there wasn't much sense in producing hordes of planes that weren't needed. Production and use was pretty steady all through the early months of 1945, the numbers available were fullfilling the need.
The K4 on the other hand, was needed badly. The Luftwaffe did not have the luxury of having half the supply in reserve. Still, only 314 with frontline units in January 45 (but given the fuel situation, how much flight time were they getting?). After that production fell off, as some units started reporting being given older types such as G6.
Besides, if number of planes used is the final determinant, the Yak 3 or La7 would win hands down, with numbers in the thousands compared to numbers in the hundreds.
Actual production of the Mk XIV Spitfire was 957, not 482. Not sure what your sources are for those figures, but they are a bit low. I have seen figures ranging from 700+ to 1500 for the K4.
Be that as it may, your graphs show an interesting trend. Nearly half of available Mk XIVs were usually non-operational, because, as pointed out by "glen" in a previous post, they simply weren't needed. The ones who were operational had a hard time finding anything to fight as it was. Too much competition from Mustangs, Tempests, Typhoons, P47s, P38s and Spit IXs.
The graphs show a peak of MkXIV use about the time the allies "knew" they would win the war, so there wasn't much sense in producing hordes of planes that weren't needed. Production and use was pretty steady all through the early months of 1945, the numbers available were fullfilling the need.
The K4 on the other hand, was needed badly. The Luftwaffe did not have the luxury of having half the supply in reserve. Still, only 314 with frontline units in January 45 (but given the fuel situation, how much flight time were they getting?). After that production fell off, as some units started reporting being given older types such as G6.
Besides, if number of planes used is the final determinant, the Yak 3 or La7 would win hands down, with numbers in the thousands compared to numbers in the hundreds.
parsifal
Colonel
Not that it matters, but wasnt something like 80% of the LW grounded or otherwise non-operational at the end of the war, mostly due to fuel shortages, but also because of pilot deficiencies. Dont the figures for the K-4 therfore appear to be somewhat misleading from that stanpoint. Perhaps not relevant to this thread, I admit
drgondog
Major
From my perspective the Mk XIV and K-4 were both in combat and should be evaluated on merit. What is debateable is to what extent the K-4, on the average, would perform to spec versus the Mk XIV at that stage of the war given the variable supply chain for parts and fuel to keep them at 'peak performance' level
Not strictly true. Typically only 12 would fly sorties at one time. Because some planes are always unserviceable, a German formation with 20 aircraft on strength would often only have 12 or so available for operations. Hooton gives the figures for German fighters available in the Reich and on the west Front in June 1944 as 983, with 566 serviceable. That's a 20:12 ratio, near enough.
I believe the figures are from a spreadsheet that lists all Spitfires produced. That shows 482 Spitfire "XIV". However, whoever has extracted the data from the spreadsheet has ignored Spitfire "XIVe", which is the Spitfire XIV with the "E" wing armament, 2 20mm cannon and 2 0.5 inch Brownings. There are another 44 of those.
They have also ignored the Spitfire FR XIV. That was the Spitfire XIV with a camera mounted in the rear fuselage. It was different from the unarmed photo reconnaissance Spitfires in that it retained full armament, and flew combat sorties, it just took photos at the same time.
There are another 423 "FR XIV" on the list, and 8 "FR XIVe".
That's a total of 957 Spitfire XIVs.
Numbers don't reflect on performance in my opinion and this shouldn't be held against LW aircraft. Alfred Price cites April 45 figures of Luftwaffe serviceability showing JG 26 and 27 could muster a little over 100 Fw 190s and Bf109s between them, which was less than either the Spitfire XIVs or Tempests facing them in NW Germany. Most all the other LW units were facing the Russians or 9th AF in south west Germany. I remember seeing a German document of serviceability for April 45, I forget where (maybe here), but it was similar to Price's data.
Kurfürst
Staff Sergeant
Spitfire XIV (all types) production per month, originally compiled by milian:
First number production in that month, second number cumulative production by the end of the month.
Total Delivered by end of month - Number delivered that month
1943 : 18 18
01-44 : 30 12
02-44 : 45 15
03-44 : 50 05
04-44 : 56 06
05-44 : 68 12
06-44 : 101 33
07-44 : 129 28
08-44 : 151 22
09-44 : 185 34
10-44 : 245 60
11-44 : 300 55
12-44 : 341 41
01-45 : 399 58
02-45 : 511 112
03-45 : 648 137
04-45 : 743 95
05-45 : 815 72
06-45 : 844 29
07-45 : 873 29
08-45 : 891 18
09-45 : 898 7
10-45 : 904 6
11-45 : 911 7
Bf 109K production
09-44 : 15 15
10-44 : 293 308
11-44 : 221 529
12-44 : 325 854
01-45 : 338 1192
02-45 : 233 1425
03-45 : 168 1593
April missing.
The problem is that a lot more was facing the 2nd TAF than just JG 26 and JG 27. There were a lot more other units on the West, not to mention that in April 1945, there was hardly a seperate 'Western' and 'Eastern' front. The Reich itself was the battleground.
I believe what you recall seeing was just the newest of Mike Williams`s brainchilds - he tries to exclude half a dozen LW unit from the unit strenght count, claiming that they weren`t in North-West Germany, but say, 100km further south or east
- waving a strenght lists which shows the Luftlotte Reich only he pulled off from Holm`s site and arriving at his usual dubious conclusions.
Apart from that, I seriously doubt the RAF could muster more then 100 Tempests and Mk XIV Spitfires for operational sorties at all, there were simply not enough in Squadrons for more, and the reason for that was that they simply could not produce more, for whatever reason.
I doubt they just didn`t want to have more - that would be rather silly in view that they were still producing ca. 320 Spit IX/XVI a month early 1945, even if that Mark was obviously a bit old to meet new requirements.
First number production in that month, second number cumulative production by the end of the month.
Total Delivered by end of month - Number delivered that month
1943 : 18 18
01-44 : 30 12
02-44 : 45 15
03-44 : 50 05
04-44 : 56 06
05-44 : 68 12
06-44 : 101 33
07-44 : 129 28
08-44 : 151 22
09-44 : 185 34
10-44 : 245 60
11-44 : 300 55
12-44 : 341 41
01-45 : 399 58
02-45 : 511 112
03-45 : 648 137
04-45 : 743 95
05-45 : 815 72
06-45 : 844 29
07-45 : 873 29
08-45 : 891 18
09-45 : 898 7
10-45 : 904 6
11-45 : 911 7
Bf 109K production
09-44 : 15 15
10-44 : 293 308
11-44 : 221 529
12-44 : 325 854
01-45 : 338 1192
02-45 : 233 1425
03-45 : 168 1593
April missing.
The problem is that a lot more was facing the 2nd TAF than just JG 26 and JG 27. There were a lot more other units on the West, not to mention that in April 1945, there was hardly a seperate 'Western' and 'Eastern' front. The Reich itself was the battleground.
I believe what you recall seeing was just the newest of Mike Williams`s brainchilds - he tries to exclude half a dozen LW unit from the unit strenght count, claiming that they weren`t in North-West Germany, but say, 100km further south or east
- waving a strenght lists which shows the Luftlotte Reich only he pulled off from Holm`s site and arriving at his usual dubious conclusions. Apart from that, I seriously doubt the RAF could muster more then 100 Tempests and Mk XIV Spitfires for operational sorties at all, there were simply not enough in Squadrons for more, and the reason for that was that they simply could not produce more, for whatever reason.
I doubt they just didn`t want to have more - that would be rather silly in view that they were still producing ca. 320 Spit IX/XVI a month early 1945, even if that Mark was obviously a bit old to meet new requirements.
- Thread starter
- #198
Sorry Bill but hat's just pure BS, I didn't take "your" opinion. I put it the way I've done throughout the thread.
The full elliptical lift distribution I have always maintained was achieved in turns, i.e. where aeroelasticity affects the wing and "bends" back the orginial 2 degree's of twist causing the whole wing to stall at the same AoA. That has been my argument from the start Bill.
One of the documents Neil got from the NA shows deliveries of aircraft to the RAF, up to 3rd September each year.
From 4th September 1943 to 3rd September 1944, 202 Spitfire XIVs.
In the next year, again up to 3rd September, 726, which means a total of 928 by early September 1945. Your figures are about 50 short by the start of September 1944, and about 37 short by September 1945.
Well, looking at the Luftwaffe claims list, scores 02/01/1945 until the end of the war against Spitfires, Typhoons and Tempests:
JG26 - 46
JG27 - 28
JG54 - 4
JG53 - 3
JG7 - 3
JG301 - 2
JG1 - 1
JG3 - 1
JG11 - 1
JG4 - 1
JG51 - 1
JG77 - 1
EJG2 - 1
(the reason for chosing the 2nd of Jan as the start date is Bodenplatte. Jan 1st wasn't typical of what units did what, either in the months before or the months after)
So 93 in total, 74 of them by JG 26 and JG 28. That's 80% by those 2 geschwader, 20% by the rest of the Luftwaffe. So the effective stregth of the Luftwaffe day fighters against the RAF was 25% larger than JG 26 and JG 27 combined.
Hardly. On the 26th April 1945 the RAF had 500 Spitfire XIVs in the UK and Europe, 62 in India (or en route)
On the same date they had 426 Tempest Vs, 32 Tempest IIs.
