Worst mass produced, monoplane, single-engine, single-seat, retractable undercarriage fighter of WW2?

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It's not only a matter of engine (he designed also the J2M which used an engine that was available when he designed the Zero, and that was universally praised by US/British pilots who flew it after the war). I think it's more a matter of what he was asked to create. Factor into that also the much better political connections of Nakajima that prevented Mitsubishi and others to use a number of alternate engines. We all knew how it played out with the Homare.

I see some people mentioning the G.50 as a possible candidate for worst fighter. There's nothing wrong with it, except that it was already outdated at the beginning of war. Italy weakness was the engines, or rather both the lack of strategic materials and the quality of the fuel available (ironic, since high octane gasoline was available to the public in '30s for sport cars even!) and this doomed and entire generation of projects till the Germans came to the rescue with their DB601-605.

Engines available in quantity to an Italian designer in the second half of the '30s:

Alfa Romeo: license built versions of the Pegasus, albeit much improved (Alfa Romeo had cross license agreements with Bristol, so that all the improvements were relayed back to Bristol) : 700-900 HP: very large diameter but at least it was reliable.
Fiat A.74: loosely based on Pratt & Whitney designs (for which FIAT had acquired the right to use their patents): 840HP, very reliable
Fiat A.80: 18 cylinder large and heavy engine derived from the A.74: reliable and cheap but offered only 1000HP
Piaggio P.IX and P.XI: licensed versions of the Gnome 14K: 700-900HP; Piaggio engines were always more 'delicate' that their contemporaries and, as such, not very popular.
Piaggio P.XII: starting from the P.XI, Piaggio engineers created an improved, enlarged version; it took a long time to mature: lightweight but very large, at least it could deliver 1500HP.
Isotta Fraschini Asso: bulky W engine with 750-1000Hp. Not very suited for a fighter plane
Isotta Fraschini Delta: lightweight V12 aircooled engine. An engineering marvel but with only 750HP it was no better than the radials of the time.

All these engines were evolutionary dead ends. The Piaggio P.XI evolved into the P.XIX using higher compression ratio and german fuel to achieve 1150HP, but that's all.
Italy was never able to mass produce an engine in the 1500-2000HP class in quantity both due to the deterioration of the situation and because all the designs available were plagued by problems that were never adequately solved.
 
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Of course they would. Those guys would have had success with the Wright Flyer.

Agreed, but it's interesting to compare the performance of the different types used by the Finns. Since all types were operating under broadly similar circumstances, the Continuation War offers some useful insights into some of the "second rate" fighters of the early 1940s. For example, despite having similar numbers of Brewsters and P-36s, the former delivered a significantly better combat performance than the latter. It's been a while since I looked at the numbers but, IIRC, the Brewster and the P-36 significantly put-performed other Finnish fighters until they started getting Me109Gs later in the war.
 
In the F-104's case weren't most of those CFIT? Hardly the crate's fault if the driver steers for the ground. The Canadians did fine with their CF-104s, assigned a NATO tactical nuke strike mission.

I don't know, the article I linked probably has the answer, I looked for info on F-84 safety records, and that was the best I came across during a quick search. Not optimal, because in fact I was looking for info on the early F-84s and the Germans used F- and RF-84Fs, a bit different aircraft. IIRC the safety record of early F-84s (B and C) was appalling.
But the story of 104 with the Luftwaffe was complicated, there were training, logistic and organizational problems. It was too complicated and demanding for the new airforce, to both pilots and ground crews. But IIRC there were a few AFs which had even higher accident rate with 104 that the German LW.
 
Id give the armament to the 406, that central Hispano cannon was a formidable weapon, albeit with only 60 rounds in the drum. The synchronized Browning's in the F2A would have only been firing about 400-450 rpm.

Your right but I read a book on the Finnish use of the MS406. In it was mentioned the replacement of the 20mm with a Russian 12.7mm and the comment was that while the 12.7 wasn't as powerful at least there was confidence that it would fire.
Spare parts for the 20mm must have been difficult to come by after a while.
 
The heck with the specs. I don't even read 'em. The Buffalo is prettier.
I've always believed that there was nothing wrong with the Buffalo in Malaya, they just needed was more of them. In Nov 1941 Malaya Command had five active squadrons of Buffaloes for a territory larger than the UK where RAF Fighter Command had over 80 fighter squadrons.

This photo below of a dozen RAF Buffaloes represents a full fifth of the entirety of Malaya Command's fighter force.



Give Malaya Command twenty squadrons of Buffaloes along with well defended, properly placed bases and they'll give the IJAF's Oscars and Nates a good fight. The Buffalo is fine, but you can't hold back a Japanese onslaught with sixty active aircraft.

It's too bad the dozen or so MS.406 didn't escape and fly to Malaya to become a Free French unit.

 

Re: the Buffalo, Eric Brown had this to say:


Brewster Buffalo / Eric Brown's opinion

I'm not sure if that's the entirety of his opinion, as that is clearly hearsay, but it doesn't seem he was carried away by the Buffalo's capabilities.

Of course more squadrons in Malaya would have been useful. I'm unsure how much so.
 

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