F4U-4 vs YaK-9U

Discussion in 'Polls' started by Soren, May 6, 2008.

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F4U-4 vs. YaK-9U

  1. F4U-4 Corsair

    67.1%
  2. YaK-9U

    32.9%
  1. Soren

    Soren Banned

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    Been a long time since we one of these excellent debates, so we'll start with te below :)

    F4U-4 vs Yak-9U

    So which one is the best ? And in a one on one fight with equally skilled pilots which will come out the victor ??

    [​IMG]
    [​IMG]
     
  2. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    Without going into each aircraft's performance specs, I'd give maneuverability to the YAK, speed and probably climb to the Corsair. A four cannon Corsair would demolish a Yak but I think the Corsair would survive a few 20mm rounds from the Yak. Overall I'd take the Corsair.
     
  3. DerAdlerIstGelandet

    DerAdlerIstGelandet Der Crew Chief
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    Im with Joe, but this is ofcourse without looking further into performance, etc.

    I dont believe these two aircraft have ever been compared in tests. Is that true?
     
  4. Soren

    Soren Banned

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    IMO the F4U-4 is the best, esp. seeing that it's faster, has a higher climb rate and offers allot more protection. As to maneuverability, well I think they're pretty close here, and the F4U-4 should, with 2,800 HP, be able sustain a slightly tighter turn.
     
  5. drgondog

    drgondog Well-Known Member

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    Always hard to make these manueverabilty judgements on paper.

    On paper, with no consideration for individual flight characteristics in a hard turn the W/L for the Yak-9U is close to 38#/ft>>2 at max weight, while the Corsair is 20% higher at 46.

    The Yak-9 had less Hp but a lot less weight. I's power to weight loading is around .2 while the F4U was lower at .15 for max weight.

    The F4U-4 had a higher rate of climb and presumably could dive faster - both had excellent speed at 20,000 feet and below, the F4U probably faster at 30,000 feet.

    Speculatively the Yak 9 could out turn the F4U and out accelerate it, had less armor and firepower, less range, less high altitude speed and less diving speed.

    I suspect the F4U was better in vertical and Yak 9 better in horizontal all pilot skill being equal.
     
  6. parsifal

    parsifal Well-Known Member

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    Some basic stats about each A/C
    Yak-9U
    Powerplant: 1650 hp Klimov VK 107A V Piston engine
    Performance: Max Sp 434 mph at 16000 ft, service ceiling 39040 ft, range 541 miles, initial climb unknown (well, from the one source I looked at
    Weights: 5988 lb (empty), max T/O weight 6830 lb
    Dimensions: span 32.25 ft, length 28.5 ft, Wing area 185 ft
    Armament: 1 x 20 mm MP-20 Cannon and 2 x 0.5 in UBS MG
    F4U-4
    Powerplant: 2250 Hp Pratt Whitney R-2800 Double Wasp Radial
    Performance: Max Sp 415 mph at 19500 ft, service ceiling 34000 ft, range 1562 miles, initial climb unknown (well, from the one source I looked at (same as the Yak)
    Weights: 9100 lb (empty), max T/O weight 12100 lb
    Dimensions: span 39.75 ft, length 33.33 ft, Wing area 305 ft
    Armament: 4 x 0.5 in Browning MG

    At a guess I am going to say the Yak can outclimb the F4U, but the wing area (which surprised me), probably means the Corsair out turns the YAK. I
    also believe that the Corsair will outdive the the Yak. The Yak appears to have the altitude advantage. Speed is also slihtly in the YAKs favour. There is very little to choose from in terms of the firepower each plan can generate, but the much heavier weight of the Corsair suggest that it has the ability to absorb a much greater amount of punishment.

    Tentatively, I would back the Corsair, but its much closer than I had thought
     
  7. marshall

    marshall Member

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    I think that there are some mistakes in the stats posted by parsifal.
    F4U-4 max speed is rather closer to 450mph at alt than 415mph and it had 4 20mm cannons or 6 .50s. Initial climb rate around 4800fpm.

    I voted for Corsair.
     
  8. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    parsifal - your source for the Corsair's armamant - 4 x 0.5 - try 6 or 4 20mm.

    From Wiki...

    F4U-4
    Performance
    Maximum speed: 446 mph (388 knots, 718 km/h)
    Range: 1,005 mi (873 nm, 1,618 km)
    Service ceiling 41,500 ft (12,649 m)
    Rate of climb: 3,870 ft/min (19.7 m/s)

    Yak-9U
    Performance
    Maximum speed: 417 mph at altitude (672 km/h)
    Range: 420 miles (675 km)
    Service ceiling 35,000 ft (10,650 m)
    Rate of climb: 3,280 ft/min (16.7 m/s)
     
  9. buzzard

    buzzard Member

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    I only checked one of my references, and it gave the Yak an initial climb rate of 4528 fpm. The F4U-5 (yeah, I know...) initial climb rate was 3780 fpm. The other specs corresponded closely with parsifal's.

    Given this, and what the experten had to say about the agility of the later Yak-9s, I'd probably put my money on the Yak in a classic dogfight. The Yak may not have had impressive firepower, but a lot of Corsairs were splashed by the similar armament of the Zero.

    As an all-round combat AC, I think the Corsair was far superior.

    I'm leaving for my fishing trip, so I won't be responding for a few days. I'll be too busy fending off the aerial attacks of the dreaded blackflies :)

    JL
     
  10. buzzard

    buzzard Member

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    FBJ,

    Just saw your post. Quite the discrepancy in the RoC for the Yak. My specs are from Jane's.

    Gotta go find my hip waders...
     
  11. renrich

    renrich Active Member

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    Michael, the performance figures that FB posted are those for F4U4. Your's are probably for a F4U1a. I don't know which Yak 9 it was or who was flying them but, if memory serves, F4Us met Yak 9s in early going in Korea and shot them all down.
     
  12. JoeB

    JoeB Member

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    A North Korean Yak-9P, all metal but basically similar performance to a U, was captured in Korea in September 1950 and tested in the US, but not in head to heads AFAIK, performance of prop planes probably wasn't such a hot issue by then.

    Also the the types, F4U-4 and Yak-9, very likely Yak-9P's, met in one daylight combat in Korea April 21 1951. A pair of VMF-312 F4U-4's, one piloted by Phillip DeLong, already an ace from WWII, claimed at least 3 of 4 Yak-9's that jumped them when they were carrying external stores, for some holes in one of the F4U's. The NK side of that combat isn't known but one Yak and its pilot's body were recovered from shallow water nearby. Of course it's only one incident and 'pilots equal' was highly unlikely to have been the case.

    Another Yak-9 was claimed in a night action by an F4U-5N whose Marine pilot also already had (F6F-5N) victories in WWII.

    Joe
     
  13. kool kitty89

    kool kitty89 Well-Known Member

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    The Corsair also used the High lift NACA 23000 series airfoil (common to the F4F, F6F, F2A, Fw 190, and portions of the P-38 and P-39, all of the Mitchel wing P-38) with 15% thickness at root, 9% at tip. (CLmax decreases with thickness over 16% for this airfoil) The CLmax for the corsair's wing was nearly 1.6 iirc.

    The Yak (and almost all soviet fighters) used a modified Clark Y airfoil (YH), the same as the Hawker Hurricane, which is a relatively simple design. (less lift or drag efficient than the NACA airfoils used, though better than the simple Clark Y) With thickness 14% at the root and 10% at tip. I don't have figures for CLmax, but I'd imagine it would be somewhere around 1.3-1.35.

    The Incomplete Guide to Airfoil Usage

    The AR of both a/c is very similar. (slight edge to the Yak, along with a high taper ratio)

    Consdering the airfoil difference they should be about equal in lift loading.

    Power loading at low alt goes to the Yak with 1,500 hp for the ~7,000 lb gross weight, compared to 2,450 hp for the F4U-4 (water injection) with 14,000 lbs gross weight.

    But if you reduce the fuel load of the F4U to be the Yak's range it would be much closer, along with even better wing loading.

    Of course actual aerodynamic test results would be needed to fully clarify the characteristics)

    Armament of the F4U is good with 6x .50's with 420 rpg giving heavy firepower for a long firing time. (at 800 rpm ~31 sec) Able to easily tear the Yak apart, while even with the 20mm the Corsair would take a good pounding. I don't consider the 4x 20mm Corsair, as 1. there weren't a whole lot of them made, but more importantly 2. they had freezing problems at altitude, and 3. the 20mm M2 cannon was still not that reliable of a gun. (much better than the M1, but not close to the British Mk.2 Hispano, or the Soviet ShVak or B-20)

    The F4U-4 also had an excellent roll-rate at over 100 degrees/s (similar to the P-47N).
     
  14. FLYBOYJ

    FLYBOYJ "THE GREAT GAZOO"
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    My numbers were from Wiki and its what they had posted for the F4U-4, I don't rely too much on Wiki but from I seen elsewhere they seem about right.
     
  15. parsifal

    parsifal Well-Known Member

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    it was 5 am down here....was barely functioning at the time
     
  16. kool kitty89

    kool kitty89 Well-Known Member

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  17. renrich

    renrich Active Member

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    KK, good tech stuff in your post. However 14000 pounds for a F4U4 is pretty high. A combat load would be 12420. That would be full internal tank of 1404 pounds, 720 pounds of ammo, basic wgt. is 10076, the rest is water/alcohol, oil. Fighter with one external tank would be 13350 pounds.
     
  18. kool kitty89

    kool kitty89 Well-Known Member

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    Yeah, but the top speed chart in that PDF of the repot seems low. (as does the cret alt, which should be ~24,000 ft)

    I think the 14,000 lb weight is full internal load clean configuration, which is more than normal combat config.
     
  19. renrich

    renrich Active Member

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    KK, the critical altitude for F4U4 at military power is about 27500 with a TAS of 425 mph. The CA at combat power is about 25500 with a TAS of almost 450 MPH. The bomber wgt. with 1000 pound bomb and 2 external tanks is 14515.Bomber with 2000 pound bomb and one external tank is 14412. All info from "America's Hundred Thousand," by Dean. The author's sources are given as Navair bulletins and manufacturer data.
     
  20. claidemore

    claidemore Member

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    Like the F4U-4, the Yak 9U also had two different weapon choices, the 20mm ShVAK + 2 x 12.7mm UB or the NS-37mm cannon +2 x 12.7mm UB (Yak 9UT, 282 produced).

    The modern Yak 9U-M, with Allison V1710 is listed as doing 434 mph. Thats 1500 hp and the VK-107A was 1650 (takeoff) 1500 normal, so pretty much the same. Some sources state 700kmh for Yak 9U (437mph), others show 672 (420mph).

    Climb rate was 5 min to 5000 meters(16400 ft), or 3280 ft/min. Thats a wee bit better than the F4U4's time to 16,000 ft of 5 min at normal power and a wee bit less than the F4U4 time to 16k at Military power. About equal in the climb department.

    According the the charts from Chance Vought, dated 1947, the highest speed I can see is 394 mph @ Combat power. Don't know much about Corsairs, and maybe I'm missing something, but thats what that chart says.

    F4U Performance Trials
     
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