[caldrail]

Now, did anyone who said that these planes were prototypes or haven't seen combat or were not production ready bother to read the top of the post.

"This is a list of planes that could have realistically seen production and done quite well in combat in a war that was harder on the Americans."

Now, the XP-67 could have been put into production right away according to McDonnell. I wonder why. Oh, that's right, because they weren't making any planes. It would have been a realitively easy change too and it was all talked about. Swap out the engines for those mentioned above and replace the cannons with machine guns and start rolling them off the line. Try reading more then just one source next time, like a book. The XP-67 was designed as a bomber interceptor, yes; however, once the need for such a plane no longer existed, there was talk of modifying the plane to be a long range escort with the changes I have listed above. There was also talk about making a gorund attack version of this plane. The escort seems most promising seeing as once the maneuverability problems had mostly been sorted out after original flight testing and since giving it more powerful engines should have sorted out the rest. Fly it like a Merlin powered P-38 with jets and you have a golden escort fighter.

Your enthusiasm for the XP67 is noted, but all the same, McDonnell were being a bit optimistic when they said it was production ready. It wasn't even close.
In December 1943, at the start of the testing programme, the experimental Continental engines caught fire and new ones weren't available to allow flight testing until March 1944. USAAF pilots found the aircraft had poor acceleration, a long take off run, an unimpressive climb rate, and in flight the aeroplane was found to be only neutrally stable laterally and thus tended to 'dutch roll'. Mr Green had this to say...

Official performance tests were be undertaken in September 1944, but on the 6th of that month the XP67 was irreperably damaged by fire. This accident, the unsatisfactory nature of certain aspects of the fighters performance, and the inordinate amount of time to complete the second prototype combined to result in the termination of the development contract.
Warplanes of the Second World War: Fighters, Volume Four (William Green)

The XP81 was on target for service with the USAAF, but the end of the war terminated the development contract. A production order for the Ryan Fireball (something like 1000 airframes were scheduled) was cancelled for the same reason and only 26 examples were delivered. The 'Flying Flapjack' was an experimental prototype and wouldn't have been considered for production as a military machine. It was more likely the company designers would have used any research data considered useful to design a purpose-built military aeroplane based on the same principles - which they didn't, as I understand it (But I'm wrong about that, see the 'Flapjack' link below)

http://en.wikipedia.org/wiki/McDonnell_XP-67
http://en.wikipedia.org/wiki/Consolidated_Vultee_XP-81
http://en.wikipedia.org/wiki/FR_Fireball
http://en.wikipedia.org/wiki/XB-42_Mixmaster
http://en.wikipedia.org/wiki/Flying_flapjack