F4U-1D, 367mph at S.L and 434mph at critical altitude.

Discussion in 'Aviation' started by Dawncaster, Mar 27, 2014.

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  1. Dawncaster

    Dawncaster New Member

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    #1 Dawncaster, Mar 27, 2014
    Last edited: Mar 28, 2014
    hello.

    I found something interesting while surfing.

    here is what I found.

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    Title: "new" 1944 F4u-1d Navair
    Post by: F4UDOA on July 21, 2006, 12:34:52 PM
    The first page is almost identical to the current AH NAVAIR performance charts. Slightly better climb rate.

    http://home.comcast.net/~markw4/F4U-1DNAVAIR1.jpg

    The second side is the differance. 367MPH at sea level and 434MPH at 20K in the "Clean" condition.

    http://home.comcast.net/~markw4/F4U-1DNAVAIR.jpg

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    Title: F4u-u1/1d/1c/u4
    Post by: F4UDOA on May 06, 2006, 09:53:13 AM
    Saxman,

    Not quite that high on the F4U-1/1D but over 3K per minute above 10K at 12,000LBS.

    I have one NAVAER Standard Aircraft performance Characteristic chart that had the top speed without underwing Pylons listed as 367MPH at Sea Level and 434MPH at 20K on the F4U-1D. It is dated mid 1944. Climb is listed slightly better than what we have now.

    I have just received a bunch of stuff from the National Archives in DC and then turned around and drove to the National archives in MD and lost half of what I got in DC. I wanted to cry. AnywayI still have some great stuff.

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    what? F4U-1D, 367mph at S.L and 434mph at critical altitude with clean configuration?!

    wow, these performances are far superior than F4U-1C/D's 1945 ACP! and similar to F4U-1 BuNo.17930's performance.

    ....but, F4UDOA's site is gone and I can't find that document.

    so I don't know whether it is true or not.

    F4U-1D ACP mid-1944 <= is it actually exist? are those results true?

    in my opinion, 1944 dash one corsair seems to be stronger than in 1945.

    ps. damn, wrong attachment! how can I remove it from post?
     

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  2. tomo pauk

    tomo pauk Creator of Interesting Threads

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    Welcome to the forum :)

    I don't think that describing that F4U as land-based reveals all the truth. Eg. that F4U (test report) featured several 'touches' that were reducing the drag (and being applicable equally for the CV-based birds), like sealing gun blast tubes and chutes with duct tape*, replacing some of the cowl flaps with fixed plate, changed tail-wheel installation. Plus deletion of the hook.
    Here is a test of the run-on-the-mill F4U-1, doing 420 mph.

    By the 1945 Corsair - do you have in mind the F4U1-D or F4U-4?

    With that said - one might wonder just how fast the F4U would have been faster with rear-facing individual exhaust stacks, with a better ram recovery, and in a full land-based 'trim'.

    BTW - the links you've posted don't work.

    * not a good idea if the plane is supposed to fire it's guns ;)
     
  3. GregP

    GregP Well-Known Member

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    Why would you think it is not a good idea to seal the gun tubes if you're going to fire them? I think all the world's air force did that at the time.

    It surely won't affect the bullets or shells. I think most people used fabric stuck on with dope.
     
  4. tomo pauk

    tomo pauk Creator of Interesting Threads

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    You have missed the other 'half' of what was sealed with duct tape, namely the chutes, through the expanded casings would be ejected. Six of those were at most of the Corsairs.
     
  5. Dawncaster

    Dawncaster New Member

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    #5 Dawncaster, Mar 30, 2014
    Last edited: Mar 30, 2014
    I mean F4U-1 1944 vs F4U-1 1945. not F4U-4

    because, case of F4U-1 BuNo.17930 vs BuNo.50030, BuNo.17930 has better speed performance at all altitude except S.L

    and F4U-1 BuNo.17930 was not so special model. just land-based and late pruduction F4U-1.

    early-1943 to mid-1944, when they were in ground-operation, hook was commonly removed.

    fixed upper plate was already equipped when 1943 with starting production of bulge canopy F4U-1(known as F4U-1A).

    other upgrades were almost standard for late model production(or upgraded at modification center) F4U-1 and early F4U-1D

    actual clean-up version F4U-1 was BuNo.2334, 431mph at 23825ft wihout water-injection(only 51.9" hg with 1715BHP vs BuNo.17930's 59.5" hg with 1975BHP), estimated speed was 443mph at 21800ft with water-injection(2000BHP)

    http://www.wwiiaircraftperformance.org/f4u/f4u-1-02334.pdf
     
  6. tomo pauk

    tomo pauk Creator of Interesting Threads

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    Okay. The F4U-1D introduced two fuselage racks, that would cut some speed?

    I've listed some other changes, too, not just the hook.

    Agreed re. fixed plate.
    No aircraft will take off with chutes sealed off, and the new tail wheel with new fairing was introduced for this test only. Of course, that modification was not some kind of brain surgery.

    You might want to check the table at pg. 3 of that report, where it says that the plane BuNo.2334, using WER, 4-bladed prop with different gearing, drag reduction (sealing, polishing, removing of wing walkways etc. - worth 16 mph; no racks?) will make 432 to 442 mph. It needed 1875 HP to achieve 432 mph at 21400 ft.
     
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