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Subject: How to fix the design defects of the Spitfire airplane of WW-II.
Shooter    5/26/2005 5:12:16 PM
Given 20-20 hind sight, It is easy to see where R.M. went wrong with the Spitfire! The following list of items is my idea of how they should have done it, IF THEY HAD READ ANY OF THE COMMON TEXTS instead of designing a newer SPAD for the last war! 1. Start with the late Seafire or even better the Martin Baker MB-5! they have contra props and wide track gear. The MB-5 also has a much higher LOS out of the pit forward. This is also one of the Spits larger problems. 2. Change the shape/planform of the wing and eppinage from eliptical to trapiziodal. The eliptical surfaces caused the construction time and cost of the Spitfire to be more than double that of the Mustang and almost as much as the P-38. 3. Reduce the wing cord and thus area by 35-40%! This reduction in surface aria will increase the cruising speed substantialy! This is probably the single biggest defect in the design. The change in aspect ratio will also help fuel ecconomy! 4. To compensate for the increased landing and take off speeds install triple slotted fowler flaps with a long hinge extension. This gives a huge increase in wing area and changes the camber for supirior "DOG FIGHT" ability, should you ever need it! ( because the pilot really screwed up!) At full extension and deflection, they would reduce the landing speed by 11~13MPH? (Slip Stick calcs!) 5. Remove the wing mounted radiators and install a body duct like the P-51 or MB-5! This one change would add ~35MPH to the plane? 6. use the single stage griphon engine and install a "Turbo-charger" like the P-38 and Most American Bombers had. This would increase power and save weight, both significant contributers to performance. 7. Remove the guns from the wings! This would lower the polar moment of rotation and give the plane snappier rates of roll! It also makes room for "wet wings" with much more fuel. A chronic Spit problem. It also fixes the Spit's gunnery problem of designed in dispersion! 8. Install the Gun(s) in the nose! Either fireing threw the prop boss/hub or on either side 180 degrees either side of the prop CL. This fixes the afore mentioned dispersion problem. One bigger gun between the cilinder banks or upto four 20MMs beside the engine or both, depending on what your mission needs were! 9. Make a new gun based on the American 28MM or 1.1" Naval AA ammo! This shell was particuarly destructive, had a very high MV and BC and was all ready in service. A re-engineered copy of the existing gun to reduce weight and increase RoF is a faily simple task. Pay the Americans for it if British spring technology is not up to the task! it also frees up much needed production capasity for other things. 10. Design a new drawn steel "Mine" shell for the above gun! Spend the money to load it with RDX instead of the TNT used for the first 4/5s of the war. 11. Pay North American or Lockheed to design it for you, since the Supermarine staff was to tied up fixing the origional spitfire design to get it done any time soon. Did I miss anything?
 
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larryjcr    RE:Larry - from the horses mouth... Larry   11/12/2005 5:18:13 PM
I would hardly have said that the RAF in the desert was 'dominant'. They were throwing numbers (to the extent that they had them) at a lot of nearly obsolete Italian a/c (when the Macchi 202s appeared, that changed) and a small force of superior Luft a/c. And that was when they were still using '109Es. When the Fs showed up ...
 
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larryjcr    RE:How to fix the design defects of the Spitfire airplane of WW-II.   11/12/2005 5:22:21 PM
To OBNW. The change in the engine and radiator on the Kittyhawk forced elimination of the nose guns. Was considered easier to eliminate them, and the synchronizer gear in favor of a much heavier wing armament, rather than spend the time and effort to alter the forward structure enough to keep them. Both the USAAC and the RAF wanted them the day before yesterday.
 
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larryjcr    RE:How to fix the design defects of the Spitfire airplane of WW-II.   11/12/2005 5:28:52 PM
Further on the matter of operating altitudes for bombers, and resulting altuitude requirements for escorts. Best operating height for a Ju88A was 18K, for Do17Z and He111 was about 13.5K. Normal operating height for a B17F was 24K. Usual height for German bombers in BoB was 5-10K lower than for B17s later.
 
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larryjcr    RE:Larry - from the horses mouth... Larry   11/13/2005 3:13:42 AM
To OBNW ref bomb racks on P40s. You statement got my attention. I find no listing of bomb racks on Tomahawks or early Kittyhawks in my sources, but there are plenty of phots showing them. I think it's the 'Government Furnished Equipment' scam in action. During the low budget period of the mid to late '30s US military services often bought stripped down a/c, tanks and other heavy items with the price figured as "less Government Furnished Equipment". They would then purchase the missing stuff (often from the same companey) under a seperate contract, as "repair parts" or some such and install it themselves. Allowed them to avoid scaring Congress with the real cost. AS the hard points for bomb racks were designed into the 'hawks starting with the P36 (which became the P40 with an engine change), installing the racks would be a simple field fix.
 
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Aussiegunnerreturns    RE:Larry - from the horses mouth... Larry   11/13/2005 9:01:14 AM
First of all I mean't that the Hurricanes and the Hawks were the dominant RAF fighters in the Middle-East, in the sense that there were more of them than anything else. I wasn't suggesting that the RAF was dominant in the battle with the Axis airforces. "the 'hawks were good, stable a/c, but the Hurri was designed as a medium altitude interceptor, not for ground attack, while the 'hawks were intended for what the RAF would have called 'Army Cooperation' from the drawing board." That's just conjecture. You have provided no evidence to say that the Hurricane was inhibited compared to the Hawk as a bomb platform, because it could also fly rings around the Hawk at altitude. Of course if you can find some evidence, perhaps a comment by a pilot who flew both, test data on CEP's from bomb delivery or records of numbers of ground targets destroyed per mission, then I might be persueded to agree. However, I'd remind you that the Hurricane was extremely successful as a gun(40mm in particular) and rocket platform in destroying tanks, which I'd imagine are pretty tough targets due to the accuracy required to hit them. That suggests to me that a. It was probably also pretty stable as a bomb platform. and B. It had armament options not available on the Hawk, that made it the more versitile type.
 
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Aussiegunnerreturns    RE:Larry - from the horses mouth... Larry   11/13/2005 9:16:41 AM
First of all I mean't that the Hurricanes and the Hawks were the dominant RAF fighters in the Middle-East, in the sense that there were more of them than anything else. I wasn't suggesting that the RAF was dominant in the battle with the Axis airforces. "the 'hawks were good, stable a/c, but the Hurri was designed as a medium altitude interceptor, not for ground attack, while the 'hawks were intended for what the RAF would have called 'Army Cooperation' from the drawing board." That's just conjecture. You have provided no evidence to say that the Hurricane was inhibited compared to the Hawk as a bomb platform, because it could also fly rings around the Hawk at altitude. Of course if you can find some evidence, perhaps a comment by a pilot who flew both, test data on CEP's for bomb delivery or records of numbers of ground targets destroyed per aircraft per mission, then I might be persueded to agree. However, I'd remind you that the Hurricane was extremely successful as a gun(40mm in particular) and rocket platform in destroying tanks, which I'd imagine are pretty tough targets due to the accuracy required to hit them. That suggests to me that, A. It was probably also pretty stable as a bomb platform. and B. It had armament options not available on the Hawk, that made it the more versatile type.
 
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oldbutnotwise    RE:Larry - from the horses mouth... Larry   11/13/2005 10:53:53 AM
Larry, I can find no evidence that eraly p40s were bomb equiped, I can find written proof that they werent, the P40 the RAF supplied to the AVG in china were not fitted with nor could be fitted with bombs - from actual AVG history! the point I was making about the nose guns was that if they were so superior the they would have made the effort! yes the BOB was fought at 7-10k less than the B17 missions however this is still 5-7k above the best operating altitude for p40s, even the later P40 had to stay below 10k if it hoped to stand a chance of playing with 109E's the earlier ones would be even less able. the problem with the high - attack - run tactic is that when confronted with fighter escor it becomes high - attack - runaway, unless you have a big zoom climb advantage you end up only having the one pass. the attack it self doesnt break up the formation and the mission continues. it is the exact tactics used by the Luftwaffe against the B17/24 with fighter escorts and history shows that it was the wrong tactic. the get amonst them and break them up tactic of the BOB was shown to be a better strategic one (however it does make individual scoring harder - but as the idea is to stop the raid not increase pilots scores this is not an issue)
 
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larryjcr    RE:Larry - from the horses mouth... Larry   11/13/2005 1:19:00 PM
First, the whole idea of the tactic was to avoid combat with the escorts. Dive past them, his and dive clear, unless actively pursued (and the '109 pilots had orders to stay with the bombers) zoom for height, then climb back up and do it again. This can break up a bomber formation just as effectively as being chased around by the escorts. If the escorts chased you, continue the dive to low level and fight him there. The German tactics involved MASSED attacks by large numbers of fighters. This is why even a relatively small escort force could be effective. Engage the mass before it could attack. Unless you can overwhelm the escort, the 'mission continues' in any event. The question is: can you inflict enough losses to discourage tomorrow's mission. As I mentioned, these tactics were used very effectively by the AVG in China on a smaller scale, of course, but the altitudes and relative performance of the a/c were similar, proportionate numbers of interceptors lower and the GCI support much more primative. I was aware that the Tomahawk I didn't come with racks, but the structure was built for them, and installation (assuming the racks and fittings were available) should not have been a problem.
 
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larryjcr    RE:Larry - from the horses mouth... Larry   11/13/2005 1:27:09 PM
Ref Tomahawk vs Hurribomber. Can't provide specific referrences for you. My claim based on USAAC pre war doctrine to which the P40 was designed. As for armament, I do agree with shooter to the extent that nose guns were more effective than wing guns, the question is about the degree. The decision was that the .30s were of limited value, and 6x .50s in the wings were better than two in the nose, especially when the modifications to the engine mountings, radiator and cowling would make keeping them a much more complex redesign job. Leaving two in the nose and just replacing the wing .30s with .50s would probably have been at least marginally better for gunnery, but would have taken more time, and meant some added complexity, having another system to maintain (the syncronizer).
 
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larryjcr    RE:Larry - from the horses mouth... Larry   11/13/2005 1:43:18 PM
The Hurri with 40mms was a fairly ingenius idea as a specialized tank destroyer, even if the limited ammo supply, and terrible effect on performance were debits. God knows that British tank forces in the desert needed all the help they could get. I know that ref. claim that a Hurri bomber could carry 2x500 lb bombs, but I'd hate to think about the performance penalty. With performance already reduced with the air filter, etc., and never all that great at low altitude (best altitude for a Hurri II is listed as 18K) what could have been left??
 
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