The old thread was lost in the forum crash, so I've reconstituted it.
I'm posting this in hopes of getting the F6F speeds corrected.
Primary sources for F6F speeds include: the postwar "Standard Aircraft Characteristics" testing (available here), a 1943 F6F-3 test by the US Army (availablehere), a 1944 comparative evaluation between F6F, F4U, and FW 190 (available here), a 1944 comparative evaluation against A6M Model 52 (available here), as well as documents posted by other participants in the old thread.
First, the results of my testing. All runs were made on the Crimea map at noon, 100% fuel, radiators closed,
elevator and rudder trimmed, full power and WEP, for ~5 minutes after speed and altitude were stabilized. TAS from gauges in no-cockpit view.
Alt.(feet) kph mph knots
SL 521 323 281
3k 521 323 281
5k 516 320 278
7k 518 321 279
9k 530 329 286
10k 541 336 292
12k 554 344 299
14k 571 354 308
15k 579 359 312
16k 585 363 315
18k 593 368 320
20k 611 379 329
22k 619 384 334
25k 615 382 332
30k 591 367 319
Now, the real-life tests:
From Navaer Standard Aircraft Characteristics test of "F6F-3 and F6F-5 airplanes." Number "2" is Combat power:
US Army 1943 test of an F6F-3 without water injection:
From F4U/F6F/FW 190 comparative evaluation. Altitudes are 200ft., 5000ft., 10,000ft., 15,000ft., 20,000ft., 25,000ft.:
From the TAIC Zeke 52 report:
All four of these tests indicate faster speeds than the F6F in IL2/PF. For a rough comparison, I plotted PF performance against
the Navaer graph: PF performance in red:
F4U/FW 190 evaluation test results in green:
I didn't attempt to graph the results from the Zeke 52 report because only the top speed is given; all other results
are in comparison to the Zeke which was not equipped with water injection. Please note that I don't consider my
additions to the Navaer chart as exact, although I think it gives a fair approximation.
Also note that the Navaer test was performed on a "second line fighter and trainer":
And that that the engine in the Navaer test is only rated at 2,030HP at SL
Whereas the F6F-5 with R2800-10W is rated at 2250HP at SL:
Another data sheet showing F6F-5 top speeds with 2250HP at SL :
Listing of F6F engines and HP from Francis Dean's America's 100,00
My conclusion is that, at most altitudes, the PF Hellcat is performing below the levels of the lowest performing
tests (Navaer "Standard Aircraft Characteristics") I could find. Also please note that the Navaer test is a postwar
test and shows a lower HP rating than a wartime F6F-5 with water injection system, and that the weight indicated is approximately 300lbs. heavier than other sources.
Hopefully this issue can be addressed.