QUOTE(Mk 1 @ Sat 28 Mar 2009 1334)

It would be tough to do an effective job of a ground attack mission against Chichi Jima in a P47.
-Mark 1
Why's that, Mark 1? At 150 miles from Iwo, it's well within the P-47's combat radius,
if we're talking about post-Iwo Jima strikes. In a late-war comparison, the P-47N had a lot more range than the F4U-4, which somewhat makes up for the lack of carrier capability, depending on what the mission is.
I've heard that the F4U oil coolers were vulnerable to ground fire, as Joe Brennan has noted. Both the P-47 and F4U used the R-2800, which has a reputation as a very durable engine. The P-47 is turbosupercharged, while the F4U was mechanically supercharged. But not a whole lot to choose from in terms of low altitude performance, reliability, or damage tolerance.
The P-47 does have (8) .50cal vs (6) for the F4U, although some F4Us were fitted with (4) 20mm cannon--although the cannon was apparently not preferred over the MGs. Additionally, in comparing the later models, didn't the P-47N have the M3, with a much higher ROF than the M2 in the earlier models & F4U-4? I think the F4U carried fewer rounds per gun, but possibly offsets this with a higher maximum bomb load?
QUOTE(From Joe Baugher's article on the P-47N)
Performance of the P-47N-5-RE included a maximum speed of 397 mph at 10,000 feet, 448 mph at at 25,000 feet, and 460 mph at 30,000 feet. Initial climb rate was 2770 feet per minute at 5000 feet and 2550 feet per minute at 20,000 feet. Range (clean) was 800 miles at 10,000 feet. Armanent included six or eight 0.50-inch machine guns with 500 rpg and two 1000-lb or three 500-lb bombs or ten 5-inch rockets. Weights were 11,000 pounds empty, 16,300 pounds normal loaded, and 20,700 pounds maximum. Dimension were wingspan 42 feet 7 inches, length 36 feet 4 inches, height 14 feet 7 inches, and wing area 322 square feet.
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Chance Vought's F4U-4 came about as a development of the F4U-4XA, which was first flown in early April 1944. It was fitted with an up-rated Pratt & Whitney R2800-18W or -42W engine. This powerplant developed 2,450 bhp with water injection. It was also fitted with a four blade hydromatic propeller which provided the necessary efficiency to utilize the greater power. The carburetor inlet was moved from the wing root leading edge to a duct located under the engine. The exhaust stacks had to be re-routed as a result. Armament remained the same as the F4U-1, with six .50 caliber Browning MGs. The limited production F4U-4B was armed with four M3 20mm cannon. Under-wing load capability was substantial. Up to three 1,000 lb. bombs along with eight 5 inch rockets could be carried. Reportedly, it was not unusual to rig the F4U-4 with as much as 6,000 lbs of ordnance. Apparently the robust structure of the Corsair could bear these loads without undue wear and tear on the airframe. Almost certainly, such overloaded Corsairs did not operate from carrier decks, but exclusively from shore bases.
Let’s compare the F4U-4 to its earlier sibling, the F4U-1 so that we can clearly see the improvements made.
Maximum speed:
F4U-1: 417 mph @ 19,900 ft.
F4U-4: 446 mph @ 26,200 ft.
The -4 displays a 29 mph speed advantage, but more importantly, does it at a considerably greater altitude. The F4U-4 is actually 10 mph faster than the P-51D at the Mustang’s best altitude.
Rate of climb:
F4U-1: 3,250 ft/min.
F4U-4: 4,170 ft/min.
While the -4 has a more powerful engine, it also weighs more than the F4U-1. This marked increase in climb rate can be attributed to the more efficient 4 blade propeller as well as the higher power of the up-rated powerplant. The increase moves the Corsair into stellar company with fighters such as the P-38L and the F7F Tigercat. The F4U-4 climbs at a rate 20% better than the P-51D.
There is little doubt that the Corsair was likely the greatest load carrying fighter of its era. There is little to compare to it except perhaps late-war models of the P-47, which still fall somewhat short in maximum load.
Most of the comparisons in the article on the F4U-4 are against the P-51, with occasional number for the P-47D. Also, the analysis is lacking in factual information on the P-47 and nothing at all for the later versions of the P-47. The article also states that the AF considered the Corsair to have a more rugged airframe, but no supporting details.
I'd say that it'd be pretty much a wash.
Douglas