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Spurts

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Posts posted by Spurts

    DCS | F4U vs P47

    in F4U-1D

    Posted

    Both really fun. The Jug has had more time to be refined, but IMO you can't beat carrier landings. I also like the cockpit layout of the Corsair, which is odd because it looks like a mess. Had no problem getting the F4U up to 40,000ft in my second flight.

    • Like 2

    FM Bug or Aircraft Feature? High Speed Dive

    in Bugs and Problems

    Posted

    Last night I did an altitude test and took the plane to 40,000ft. From there I wanted to see the behavior in a high speed dive.  Leaving prop set for max RPM and throttling engine to max MP, I put the plane in a 50-70 degree dive. I rapidly reached 540KTAS (per tacview) and the prop never oversped, the MP never redlined, and it held ~540KTAS from 24,000ft to 7,000ft when I pulled out of the dive.  Every other warbird I've flown would have killed the engine and lost the prop to try a full power and max rpm dive like that.  Is there some feature of the engine that lets it safely be put into dives like that or is the overspeed mechanic not implemented yet?

    • Like 1

    Tips for keeping the energy for dogfighting

    in DCS: F-14A & B

    Posted

    On 4/10/2025 at 4:54 PM, RustBelt said:

      (The real plane has ways of making full aft stick very difficult) 

    I get around this by going full forward trim on entering BFM.  Stops me from getting that last bit of up elevator and means all I have to do is relax pressure to get the "nose down" to speed up.

    • Thanks 1

    F-14A/B Flight Model Tuning - Guided Discussion

    in DCS: F-14A & B

    Posted · Edited by Spurts

    1 hour ago, cheezit said:

    The A3D was heavier (MTOW of 82,000 lb vs 74,000 and change as the final MTOW for the Tomcat), no?  And of course the F-111Bs that had some cat shots and traps during carrier suitability testing were much heavier - fair game not to count those since the aircraft (thankfully) never served!

     

    Looking over several variants of the A3D on Avialogs (https://www.avialogs.com/aircraft-d/douglas/itemlist/category/306-a-3skywarrior?start=12) shows that even as the weight increased with later variants the Max T.O. Cat weight doesn't exceed 73,000.  Not that I am finding anyway.  I never mind an honesty check if I ended up missing something.  You are right about the F-111B though, showing a near 78,000lb Max TO Cat weight.  I never consider it since it never went to service.

    • Like 1

    F-14A/B Flight Model Tuning - Guided Discussion

    in DCS: F-14A & B

    Posted · Edited by Spurts

    On 4/10/2025 at 10:57 AM, TotenDead said:

    Well, since the aoa limit was 28 units (e.g 22 degrees) that looks like something very-very far from what service pilots could do. But anyway, that doesn't contradict what I wrote about perfect conditions pulls


    Anyway, It would be really great to see any documentation about 9.5Gs you wrote about. So far all I could find stated only 6-7.5Gs

    The AoA indexer goes to 28, and 28 may correlate to 22 degrees under certain circumstances, bit that is not the AoA limit of the F-14.  "F-14A High angle of Attack Characteristics" paper from August 1976 P.582 Figure 12 shows that max deflection of the horizontal tail results in pitch up moment just past 40 degrees, and P583 states "An unrestricted alpha capability does more than allow the pilot to generate superior levels of instantaneous g. Pilots have found that by flying above alpha=30 deg they effectively convert the aircraft into a flying speed brake.... Also, when flying in the high alpha region, the pilot finds it extremely easy to command the attitude changes required to point the aircraft at the target as he falls in behind his adversary."

    I have several times in DCS reached 40 degrees AoA in hard pulls.

    As to the 9+G stories, the book "Tomcat: Bye, bye, baby" has numerous accounts and the AIMVAL/ACEVAL reports show plots of how often the planes in that test exceeded 6, 7, 8, 9G

    And the 12G pulls weren't test pilots, but operation pilots during both peacetime training scenarios and wartime scenarios.  The F-14 IS OVERBUILT as you mentioned it would be.  There is a reason it is so much heavier than everything else.  It is the heaviest CATOBAR aircraft ever.

    • Like 3

    F-14A/B Flight Model Tuning - Guided Discussion

    in DCS: F-14A & B

    Posted · Edited by Spurts

    3 hours ago, TotenDead said:

    Iirc, the F-14 in the game can pull 12+G turns without breaking apart. Will that be fixed? I mean, it's only a 6.5G aircraft, its structual limit should be around 10Gs tops

    this is a common misconception.  Grumman built the F-14 to be a 9.5G aircraft and tested it to 12 G. The Navy doesn't like anything more than 7.5G which was the initial NATOPS rating.  The Navy then lowered the NATOPS limit to 6.5G wartime and 5.5G peacetime for maintenance reasons but pilots still pulled 9-10+G when needed.  There are a handful of accounts of 12G pulls not breaking anything.  The G model HB is using is historically accurate.  Also, the design of the F-14 is such that if you are going fast enough to pull that high of G the wings are generally going to be swept which reduces the structural loads, and at lower speeds and altitudes where you may get high G with upswept wings the wing stalls and produces less lift above a certain angle of attack but the body lift compensates resulting is the normal force coefficient peaking around 30 AoA and not decreasing as AoA goes towards 90 (but as this is a normal force less and less is lift and more and more is drag)

    • Like 8

    F-14B Causes DCS to Crash

    in Bugs and Problems

    Posted

    21 hours ago, Silhou said:

    Hey Spurts! The mod could be an issue. If you could, please, try the module without is and let us know how it goes. Thanks!

    So I did end up removing the mod.  The B loaded just fine and the AP worked as expected.  I didn't even think about the autopilot issue I was having being a possible bug I just thought I was setting it up wrong, but with the mod gone it all went perfectly.  Thanks everyone for the feedback.

    • Like 1
    • Thanks 1
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