Level flight speed

[Saxman]

34 minutes ago, Rudel_chw said:

 

You maybe are confusing with the F4U-4 specs, the F4U-1 only did 378 mph at 20,000ft.

Source: https://www.wwiiaircraftperformance.org/f4u/f4u.html

 

The F4U-1 without ADI had a top speed of just at 400mph TAS at critical altitude. With the addition of ADI the later F4U-1As and retrofit earlier models reached about 425mph at the upper end. The F4U-1D and C lost about 5-10mph because of increased drag from the knuckle pylons.

Edited 7 hours ago by Saxman

[AJaromir]

According to my previous test (before patch 2.9.19.13478 which added WEP switch) I had 396 mph TAS at 20k . I will make new one.

Edited 5 hours ago by AJaromir

[-Rudel-]

The Mk.IV test dated December 1944, is probably the best document to use as it's the closest to a F4U-1D test that can be found.

https://www.wwiiaircraftperformance.org/f4u/kd227.pdf

Edited 23 minutes ago by -Rudel-

[AJaromir]

32 minutes ago, -Rudel- said:

The Mk.IV test dated December 1944, is probably the best document to use as it's the closest to a F4U-1D test that can be found.

https://www.wwiiaircraftperformance.org/f4u/kd227.pdf

Nice. Seems like I am very close to this. I am looking forward to make the new one.

[Saxman]

2 hours ago, -Rudel- said:

The Mk.IV test dated December 1944, is probably the best document to use as it's the closest to a F4U-1D test that can be found.

https://www.wwiiaircraftperformance.org/f4u/kd227.pdf

Which is odd because there's other performance tests of F4U-1 subvariants on the same site that show speeds approaching 420mph.

[-Rudel-]

Sorry, I derped out on KD227.  It is a Mk.IV, but only because it was built by Good Year.  It's still a -1A.  KD227 build 14658
I'll strike my post out.

Though, of all the F4U-1 tests on that sight, they are all either -1s or -1As.   Not a single -1D.

Now there is a 'Detailed Specification' document that was revised for the -1D.
It states in Paragraph 113a, that the listed data is estimated.  
Under the same paragraph, Note 2 states the data is based off of rated engine powers in Paragraph 503.a...551.b for some propeller specs.
But those documents are missing.  That report is missing a lot of pages.

The data used could have possibly been from a -1A, but won't know until the full report is available.

Edit In, if F4U-1D tests are ever found.  "Clean" should indicate no pylons attached.  Otherwise, the tests should specify the conditions in detail.
 

Edited 13 minutes ago by -Rudel-