4.11 F4U Performance

[h0MbrE]

Originally Posted by IvanK

All the published performance data is TAS. So when comparing Sim test performance to published data use TAS as well. Wonder woman view gives TAS.

I think this may be part of the problem. The new top speed of the F4U in the sim is around 270kias (311mph). That is almost exactly the max IAS of the aircraft in the performance data. The truth is the actual TAS of the aircraft in the performance test was 431mph (375kias).

I am referring to this document from some of the 1943 official performance tests:

http://www.wwiiaircraftperformance.o...4u-1-02334.pdf

Not sure what you mean by "Wonder woman view" unless you are referring to the hud. I fly mostly full real anyhow but for our tests I will use the hud for reference.

[IvanK]

Originally Posted by h0MbrE

I think this may be part of the problem. The new top speed of the F4U in the sim is around 270kias (311mph). That is almost exactly the max IAS of the aircraft in the performance data. The truth is the actual TAS of the aircraft in the performance test was 431mph (375kias).

I am referring to this document from some of the 1943 official performance tests:

http://www.wwiiaircraftperformance.o...4u-1-02334.pdf

Not sure what you mean by "Wonder woman view" unless you are referring to the hud. I fly mostly full real anyhow but for our tests I will use the hud for reference.

Hombre be more specific at what altitude ?

Try everything at Sea level Crimea. See what numbers you get then compare them to a specific chart from your reference.

Also read the title of that report .. it refers to a test for max performance at War Emergency Power of a "Cleaned up version"



When I test in 4.11 Again Crimea Midday, WEP, RAD 2, 100% Fuel at 19,000ft (FTH Supercharger 3) I get the following:
240KIAS,280MPH IAS, 633KMH TAS (that works out at 393MPH TAS or 342Knots TAS)

The Max speed achieved in the Cleaned up test aircraft was as the report shows 429MPH TAS (averaged of the 2 runs). Its also worth pointing out they flew the test at 23,000ft, rather than the 19,000ft I flew the test.

[h0MbrE]

Perhaps it would be helpful if you would share the performance data you used to model the aircraft as well. I'm doing the best I can here by researching and citing my references but I feel that I am simply hitting a brick wall. I'm sure your data is more relevant and official and I would like to see it as well if you don't mind?

[h0MbrE]

Also, if you look at the date of the document these tests were conducted on the earlier model F4U-1 in 1943. After which the aerodynamic and performance improvements were made and then the C and D models were developed. Take a look at this doc from the US Navy Bureau of Aeronautics dated 1945 on the test results of the F4U-1C and 1D models, FULLY LOADED (defined in the doc), which we also use in the sim:

http://www.wwiiaircraftperformance.o...f4u-1d-acp.pdf

[JtD]

Originally Posted by h0MbrE

http://www.wwiiaircraftperformance.o...f4u-1d-acp.pdf

It says 409 mph top and this is what you get in game.

Would be nice to not clutter up a General debugging topic with a single FM debate.

[h0MbrE]

Originally Posted by JtD

It says 409 mph top and this is what you get in game.

How is this achieved? Altitude, throttle, pitch, fuel, armament, difficulty switches (overheating on/off)? I have never been able to get this out of a Corsair in this sim in level flight with full real settings or otherwise. Please give me a scenario and I will try to duplicate it.

Would be nice to not clutter up a General debugging topic with a single FM debate.

The issue was already underway in this thread before I made a post. If it would be better in addressed another thread go ahead and move all the posts on this issue there. It isn't my intention to clutter anything up.

[JimmyBlonde]

Originally Posted by JtD

Would be nice to not clutter up a General debugging topic with a single FM debate.

^^This^^

[BadAim]

Holy crap, what a bloody freaking mess! This is a BUG thread, not a disagree with the developer over every thing they've done with the sim thread. Does anyone know the difference between a bug and your own personal opinion on one plane's flight model? WOW. I'm really surprised anyone bothers.

[MadBlaster]

Originally Posted by IvanK

Hombre be more specific at what altitude ?

Try everything at Sea level Crimea. See what numbers you get then compare them to a specific chart from your reference.

Also read the title of that report .. it refers to a test for max performance at War Emergency Power of a "Cleaned up version"



When I test in 4.11 Again Crimea Midday, WEP, RAD 2, 100% Fuel at 19,000ft (FTH Supercharger 3) I get the following:
240KIAS,280MPH IAS, 633KMH TAS (that works out at 393MPH TAS or 342Knots TAS)

The Max speed achieved in the Cleaned up test aircraft was as the report shows 429MPH TAS (averaged of the 2 runs). Its also worth pointing out they flew the test at 23,000ft, rather than the 19,000ft I flew the test.

Besides the altitude difference accounting for your slower in game speed, weather/temperature differences? Looks like the real life test was done during winter time. Not sure what the Crimea Midday temp is modeled to. But it's not a winter map, or is it?

[h0MbrE]

The season they did the tests in is irrelevant. It was probably done in Hawaii or somewhere in the southern part of the US where there is no winter. Besides... as I pointed out in an earlier post, this test was done early in 1943 on the earlier 1942 F4U-1s. After which the improvements were made and the C and D models were produced. Once again, refer to THIS document for the relevant test results on the 1944, 1945 C and D models we use in the sim:


http://www.wwiiaircraftperformance.org/f4u/f4u-1d-acp.pdf

We need to stick to the facts here and not be assuming things that might or might not be a factor. These tests were conducted at different altitudes and weapon/fuel loadouts, but the planes were ALL loaded as the official documents clearly point out.

Edit: Also if you notice at the bottom of that doc you will see "Water available for approximately 8.5 minutes at combat power". Wasn't the water cooling removed with 4.11 which causes it to overheat more quickly?