4.11 F4U Performance

[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.

Also there is always an issue with Atmosphere so do your tests Crimea Midday.

[IvanK]

Sawyer. What supercharger settings (3) were you using in your 20,000ft test ? and on what map.
a 60KIAS diff is huge.

[sawyer692]

Originally Posted by IvanK

Sawyer. What supercharger settings (3) were you using in your 20,000ft test ? and on what map.
a 60KIAS diff is huge.

Super 3 on the 20K test using coral sea map. I used that map for all the tests I did. I also took video of the tests if that helps although it would be simple to set up a scenario.

I do appreciate your "ear" on this and your responses.

(I also pondered the TAS vs IAS but the comparison shows air is air)

[h0MbrE]

Originally Posted by sawyer692

I do appreciate your "ear" on this and your responses.

Likewise

[IvanK]

Sawyer your 20,000Ft figures for 4.11 are way off. in your post 120 You got these numbers:

20,000ft
4.101 – 222kias
4.11 - 160kias
i.e. a diff of 62KIAS

I re tested in both 4.10.1 and 4.11.
F4U1C, 100% Fuel, Rad 2, 100% Power Prop pitch 100%, Supercharger 3 Default, Crimea Midday
I get 220KIAS or 579KMH TAS in 4.10.1
I get 210KIAS or 566KMH TAS in 4.11
A diff of 10KIAS or 12KMH TAS

Wonder Woman view cockpits off with the gaudy circular instruments

[sawyer692]

Originally Posted by IvanK

Sawyer your 20,000Ft figures for 4.11 are way off. in your post 120 You got these numbers:

20,000ft
4.101 – 222kias
4.11 - 160kias
i.e. a diff of 62KIAS

I re tested in both 4.10.1 and 4.11.
F4U1C, 100% Fuel, Rad 2, 100% Power Prop pitch 100%, Supercharger 3 Default, Crimea Midday
I get 220KIAS or 579KMH TAS in 4.10.1
I get 210KIAS or 566KMH TAS in 4.11
A diff of 10KIAS or 12KMH TAS

Wonder Woman view cockpits off with the gaudy circular instruments

I gotta give you that one, WEP made a big difference. I was running at 99% throttle in the test I posted (forgot to mention that). I just tested again with WEP (no rad) and got it to 220kias per the speedbar.

I'll get together with my squad and do some more testing and research in the next couple days.

Again, I appreciate your time on this matter.

[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