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eh, Contrary to what?
I would rather represent myself, thank you... Besides just to make it clear, and short, my position being:
8th AAF FC had it,
15th AAF FC did not (to my best knowledge)
the RAF FC/ADGB didnt, save for a handful of Sqns on anti diver missions, when that ended, even those didnt get it anymore
the 2nd TAF didnt get it either, not until jan/febr 45, and only for Spit sqns (tiffies/tempest wouldnt benefit anways). As per Berger, the stuff was troublesome and they reverted back to lower graded b4 the war ended.. in short in real operstional use, they had, for about two months at the wars end, at +25 a spit 9 that was equal to the boosted G6s and G14s the jerries had for a year by then, and were already phasing out by 1945...
A couple of ironies I like to mention...
- Though the brits produced the stuff mostly, yanks used almost all of it for their fighters
- while MW and his bunch were campaigning for this 150 stuff for years, quite obviously in hope that this was the magic stuff Allied planes had and LW ones didnt, our research reveals the jerries had it a year before the brits, and produced and used the magic stuff in far greater quanties.. not that it would matter IMHO that much, just being a bithere
Sir drgondog ,
1) eyesight is certainly more important than any technical parameter of any fighter
We both agree
2) Why P51H was not chosen for Korean war service?
Because it was still a first line long range interceptor and escort for SAC and the 18th and 35th FBW were equipped with D's - on location in Japan - further there was zero advantage to deploying the P-51H to Korea when its enhanced performance over a D made no difference in ground support role.
3) I have not the slightest respect for M.Williams and his site. The man is biased ,cooks up evidences and documents , compares aplles with oranges. Kurfust has exposed him many times , has proven his in purpose wrong statements .
OK to disagree but not necessarily correct - Kurfurst has been damaged from time to time, as all of us have, in these debates
4) Kurfust is a well known researcher mainly of Bf 109 . He has presented evidence that 150octane fuel and high boost pressure in alleid fighters had many problems and sporadicaly used. Every Luftwaffe fun ,me included, who respects himself accept his arguments. I consider the 75" P51D against standard Jumo 213A +Mw50 D9 fully equal at all altitudes. (and much superior above 7000m)
Kurfust would be correct if the assertion you refer to is fouling of plugs - 'sporadic use' would not be correct. Early plug failures, not fully resolved until a new plug with different operating temperatures, limited normal plug life to 25 hours before complete change.
Except for his first three weeks of combat June 6-June 30 he used 150 octane fuel in his Mustang 100% through April 1945. The Fighter Groups did not have the 'option' to pick and choose the type fuel delivered to their storage batteries - that was WAY above their pay grade.
5)Rate of roll important only for defence??? No sir ,i disagree . Aileron turns are most important in most offensive combat manouvers. It requires skills ,yes, e.g. deflection shooting capabielities.
Max Roll is critical to evade an opponent on your tail - to a.) get out of line of fire, and b.) enter either a sharp turn or c.) continue to roll and reverse when you have the advantage. Deflection shots based on max aileron input and hard stick would be luck - not skill
6) The dominant factor in acceleration is power loading and propeller profile. Drag is secondary factor . Must be a huge diference in drug to see noticable results. P51 had a front plate equivelant surface 4,10ft2 ,d9 4,78ft2 , 190a 5,22ft2 .P51 a total wer area of 885ft2 ,d9 721 ft2 .Do you consider these diferences huges? Yes they affect speed, but not acceleration.
Of course drag affects acceleration but power loading and propeller efficiency is more important if drag is close. They all (parasite, induce drag) influence acceleration but power loading is more important initially and while in the middle range of the drag bucket. At the high end of the drag bucket, drag becomes increasingly important when the available thrust of the engine/propeller system diminishes.
7) If you see 190s front wing spar you wiil understand
Here is what I understand - the spar design of any airframe (WWII for sure) is calculated to take out bending loads by translating the bending to compression on one cap/skin component and tension on the opposite cap/skin component. The web in a classic "I of H" spar has to be sized to ensure the shear stress between the tension and compression cap are not in excess of allowable stresses.
Next - that height of the beam is limited by the depth (or thickness) of the airfoil at the point on the chord where the spar is located. For a thin wing you need greater cap area, top and bottom, for a tall wing smaller cap areas may be considered. Local skin thickness (top and bottom) of the wing is an important consideration in sizing the spar caps.
Next - torsion due to the resultant loads applied eccentrically to the spar as well as aereoelastic bending caused by such eccentric loads as aileron input, wing stiffness, etc offer different approaches to sizing (and placement of secondary beam member - like wing/flap intrerface) of primary and secondary spars.
Soren and I got into a lengthy and heated discussion of probable cause of Fw 190 violent stall characteristics - I suspected that it was a combination of no washout for the last 20% of the wing couples with a possible torsion over load due to the aileron input of the high wing (higer lift/higher relative AoA)
But I am not sure. The Fw 190D also had the same wing - correct?
The point I want to make is that a mark one eyeball inspection of a spar tells you nothing - you need the drawings, the loads, and the structural analysis to read between the lines.
8) I respect your opinon .I respect ten times your father and i am certain that he reported exactly what he found. However i must notify that his impressions are in direct contradiction with dozen of reports from german pilots, both test pilots and operational pilots.As well as technical rules. Every german who flew the aircraft reported better turning than A model with normal propeller . Techically it make sense because D is slightily heavier but more powrful,have some exhaust thrust, and better aerodynamics. At least sustained turn rate must be better.
I have no problem with your comments. There is no way to postulate that my father's impressions of the Gablingen Dora versus the two seater Fw190A are valid, but they are against the Mustang, at least to the point that he was flying against very good pilots in well maintained Mustangs and made the judgment that the Dora was an excellent airplane.
My father's conclusions were certainly "anecdotal' based on informal rat racing with fellow highly skilled Mustang pilots - with no controlled set of tests other than flying in line abreast formation and evaluating climb and acceleration, flying in trail to evaluate turn.
Give me a single techical reason why D should have notifiamble reduced RoR with the same wing minus external guns. Also while all accounts report that ailerons did decame heavier above 400mph all Fw had excellent high speed manouverability.
Simply stated there is No technical reason I would offer to differentiate roll rate for the A versus the D. Removal of most wing armament for the D should reduce the rolling rate of intertia, the wing span and shape are the same because it is the same wing and I am not aware of any additions to outboard wing stations for the Dora.
Having said this, engine torque probably was higher in the Dora so a roll complimenting the engine torque should slightly enhance the Dora over the Anton for that vector while the roll direction opposite the torque vector should reduce the roll rate in comparison with the Anto for the same turn.
Rigging can also bequestioned for my father's experience- but not necessarily
Your father reported exactly his founds but: He did not use Mw50 , ailerons were most propably not adjusted correctly, and general aircrafts situation acceptable for flights but not optimized.YOU CAN NOT DRAW CONCLUSIONS OUT OF CAPTURED MACHINES .
Ergo - no conclusions may be drawn as all comparisons between a Dora and a Mustang were made with captured machines - yes? As to optimization no conclusions may be drawn either. I don't know that Mw50 was or was not used.
We dont even know if that particular example was properly built. Did your father had the knowledge to fly the aircraft to its limits? British test pilots reported poor turning for Bf109 but the were getting out of the turn as soon as slats started to deploy!!!!!Was he willing to take the risk of pushing an unKnown machine? Had the german flight instructions? Who maintenaid the aircraft? US personnel? Captured black men? Were they happy and cooperative ? Brown was sabotaged in a Ar234 by an prisoner black man. What kind of fuel they used ? I dont mean octanes , if it was cooperative with german injection and lubricants.( In no way i am saying if he was a good pilot i am sure he was excellent pilot, i ask if he was familiar with german equipment)
Anyway you are wriht after all Its close enough to consider pilot ability and tactilal situation and deploypment the desicive factors.
To cut it short, I have no problem with the 8th AAF deliveries... the numbers are there (20 000 tons per month IIRC, and that through the conflict from about June 44.)
The only thing I am unsure about are P-47s and esp. the P-38s - the latter were, more or less, withdrawn at around the time the new juice arrived. The other thing that is hazy is wheater 72" or 75" was the limit on Mustangs; that they used the fuel and enjoyed a significant boost in performance (and some maintance difficulties, re: spark plug life) is not.
The RAF otoh is another question though.
eh, Contrary to what?
A couple of ironies I like to mention...
- Though the brits produced the stuff mostly, yanks used almost all of it for their fighters
- while MW and his bunch were campaigning for this 150 stuff for years, quite obviously in hope that this was the magic stuff Allied planes had and LW ones didnt, our research reveals the jerries had it a year before the brits, and produced and used the magic stuff in far greater quanties.. not that it would matter IMHO that much, just being a bithere
The Germans had 150 grade C3 fuel in 1943?
http://www.fischer-tropsch.org/Tom Reels/Linked/A5464/A5464-0638-0654 Item 6A.pdf
Why was 150 octane not found in the test results?
See also Report No. 2197 dated Sept. 16 1943.
Spellcheck, it works wonders....
Where do you get that from Vincenzo?
flyboy,how well are you fluent in german? wandering minds would like to know. give jim a break! i vote to have you replaced as a moderator.
With all respect to the rules of the forum i must say that shooting german pilots after paqachuting was a quite common practice for american pilots.
3)Generally speaking P51 and Dora are in the same performance class. P51 is superior as escort fighter. D9 is superior as general air superiority fighter up to 7000m
(D13 with jumo 213f is superior at all altitudes, with 213EB ,db603L even challenges P51H performance without sacfificing armor ,armour, and structural strength as -H did (the reason that did not see Korea service)
D9 has better power loading=better acceleretion+ wing loading (not much of a difference)+ ,wide blade propellers =better roc
In the subject of high boost pressures in late war allied fighters i fully adupt the arguments of Kurfust. In additon i say that is not that simple to increase piston engines output.Just bring improve fuel and raise the boost pressure in a ALREADY operating engine. There are technical points and limitations
If we accept your claims about 72" HG there was answer in form of C3+MW50 213A=2240ps, 213EB, 213F,DB603EC, DB603LA ,DB603L , 222E/F , all these engines ready for productin but the boys of B17s had other opinion .
Finally i must say that i am very sceptical about the 487mph of P51H . But maybe i am wrong.
But P51 is the winner in the most crusial way: Was in the wright place ,in THE WRIGHT TIME. The hesitation of luftwaffe to introduce new types in order no to interupt production meant that Dora never had the chance to face the mustang in somewhat better odds.
Just my thouhts
2) Why P51H was not chosen for Korean war service?
3) I have not the slightest respect for M.Williams and his site. The man is biased ,cooks up evidences and documents , compares aplles with oranges. Kurfust has exposed him many times , has proven his in purpose wrong statements .
With all respect to the rules of the forum i must say that shooting german pilots after paqachuting was a quite common practice for american pilots.
3)Generally speaking P51 and Dora are in the same performance class. P51 is superior as escort fighter. D9 is superior as general air superiority fighter up to 7000m
(D13 with jumo 213f is superior at all altitudes, with 213EB ,db603L even challenges P51H performance without sacfificing armor ,armour, and structural strength as -H did (the reason that did not see Korea service)
D9 has better power loading=better acceleretion+ wing loading (not much of a difference)+ ,wide blade propellers =better roc
In the subject of high boost pressures in late war allied fighters i fully adupt the arguments of Kurfust. In additon i say that is not that simple to increase piston engines output.Just bring improve fuel and raise the boost pressure in a ALREADY operating engine. There are technical points and limitations
If we accept your claims about 72" HG there was answer in form of C3+MW50 213A=2240ps, 213EB, 213F,DB603EC, DB603LA ,DB603L , 222E/F , all these engines ready for productin but the boys of B17s had other opinion .
Finally i must say that i am very sceptical about the 487mph of P51H . But maybe i am wrong.
But P51 is the winner in the most crusial way: Was in the wright place ,in THE WRIGHT TIME. The hesitation of luftwaffe to introduce new types in order no to interupt production meant that Dora never had the chance to face the mustang in somewhat better odds.
Just my thouhts
2) Why P51H was not chosen for Korean war service?
3) I have not the slightest respect for M.Williams and his site. The man is biased ,cooks up evidences and documents , compares aplles with oranges. Kurfust has exposed him many times , has proven his in purpose wrong statements .
Dave - here is the 51H handbook - not NAA performance calcs..