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  1. D

    The 10 Most Beautiful Military Jets Ever

    any omisson of the F-86 is flawed.
  2. D

    Schneider trophy racers were much lighter than Reno unlimiteds with same size engine

    This is an old thread but would like to make some comments to clarify The XP-51F had the same 1650-3 as the P-51B and early D's The speed increment over the B was nearly 15mph with GWTO of 6930 to P-51B at 8400 pounds. Both with 100 gal fuel. Both tested at 61"/3000 rpm. Both tested with 130...
  3. D

    The history of Fox model airplane engines

    eBay always has a full range of Balsa kits, some current, mostly vintage.
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    Aerodynamics of Propulsion

    Thanks, I haven't seen one such either.
  5. D

    Aerodynamics of Propulsion

    Hoerner, while using the Bf 109G as an example, was trying to keep (THp Avail to THp Required) the calcs simple and generic by reducing to Force = Drag. You note that he presents a range of delta Tlb = (0.11 to 0.13) Php directly above his statement that the 109 thrust wa 140 pounds. He doesn't...
  6. D

    Aerodynamics of Propulsion

    Henning - that is an intersting estimate for the 109's DB 605. The equivalent exhaust gas thrust for the P-51B-1 wth Packard 1650-3 at 67" and 29000 feet is about the same for 440mph TAS. For your estimates were you basing them on the NACA tables and plots found in NACA Advance Confidential...
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    Aerodynamics of Propulsion

    The 'optimal' design objectives for NAA for Mustang cooling system was to achieve even pressure distribution across the Intercooler/radiator matrix, following reduction in airflow velocity as managed by the expanding plenum. Between 1940 and spring 1943 there were many changes to the design of...
  8. D

    BF-109 Aerofoil Question

    Interesting (or not), the NAA model P-509, progenitor for NA-73X, proposed NACA 2416-34 and a NACA 23016 as the back up had the AA/NACA 45-100 not been successful as the Mustang airfoil of choice.
  9. D

    B21 Reveal

    Agreed - if there is no search algorithm on constant alert from current/future radar capable of detecting 'point' wake turbulence in contrast to air surrounding it. I suspect detection of a 600 mph induced drag vortex wake on grand scale could switch to a tracking radar, then lanch optical...
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    Could the Working Class Afford a P-51?

    One factor that elevates high performance warbirds like the P-51 and F4U above norms is liability insurance.
  11. D

    Increasing size of a plane

    Simple answer for future flight safety and/or acceptable flight characteristics. No. An'upscaled' airframe is a new design with respect to stuctures, so for flight safety you will have to start from scratch on every shear panel, longeron, bulkhead, fitting, etc. designed to Allowable Stress...
  12. D

    Jurca me109

    The induced drag of the slats and an untwisted wing, was lower than conventional design wash out for the otherwise same wing. Roll authority is required for low speed stability and solved (WWII era) with either fixed washout or external slats and no washout to better move lift distribution To...
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    Introducing AeroAcademy - Online Courses about Aerodynamics and Flight Dynamics

    Tutoring on a paid syllabus means extreme caution on 'teaching' a method to predict and apply aerodynamic loads to the design airframe. It is a legal way to tell you Go With God' to get yer 'assumed' loads. "Airframe Structures" by Peery is an excellent text addressing not only structures but...
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    Jurca me109

    Why would replacing slats with wing fences be of remote benefit to the 109 wing? True the slats were a mechanical disadvantage (maintenance) perhaps to a simple wing fence, And... The slats did create issues when one delayed deployment in high G asymmetric turn condition, but the slat did...
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    Need help to understand airflow

    ALL of the airflow shown is turbulent. There is no laminar flow for RN> ~ 500K and most full scale a/c are in the 2x10^6 and greater in flight. What the tufts show is whether it is immersed in free stream or in an 'eddy' created during full blown boundary layer separation. BL behavior may be...
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    Need help to understand airflow

    I would disagree the last statement. One of the most important design considerations forward of max cross sectional area of an aircraft is to minimize the velocity gradient from spinner to Max Cross section. The Mustang had three monstrous drag advantages built in to the design: 1.) Conical...
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    Wanted: Bruce Carmichael Personal Aircraft Drag Reduction Book

    Hoerner's Drag book is pretty good compilation of all components of parasite and pressure drag.
  18. D

    Aileron Design - What works and why?

    Get some soaring time, and all your 'yaw in turning' blues will go away with now instinctive rudder input. Those tufts will do wonders for learning the difference between a 'skid' and a 'carved' turn.
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    German P-51????

    Corky Meyer is a highly respected pilot whose opinions deserve respect. I had an opportunity to talk to him just after he published his book - at Oshkosh circa 2007? Because of the high investment and maintenance costs of Warbirds, nobody (including Meyer) pushed either the P-51D or P-47D that...
  20. D

    German P-51????

    Respectfully - the availability of C3 was always there for Rechlin Test operations and the 51B when captured was using 130. The P-51B 'light' at 61 in. MP was delivering 445mph in May 1943 test flights - as well as 4100fpm ROC down low. There was never a reason to load the captured P-51B with...
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