Sorry guys, it's been a busy weekend and, worse yet, none of it was work related. I've got a couple of new clues for you all. I'll throw in a second pair so tomorrow will be covered as well.
Looking for an aircraft:
1) This plane was built by a well known manufacturer
2) This plane was designed to use tech that was new at the time.
3) This plane featured a single engine and crew of 2
4) The tech used in this plane was also used on planes manufactured by allies and adversaries, some of which became legendary
5) Several of the planes referred to in clue 4 had service lives of over 20 years
6) Only one of the subject aircraft was built
7) The plane was cancelled due to two things the government couldn't overlook
8) The engine was not manufactured by the country building the plane
9) The single engine design did not give the performance or survivability desired.
10) While the plane was destroyed during it's third year of testing, the pilot was unhurt due to bailing out
11) The plane in question shared a fuselage with another aircraft that was also destroyed during testing
12) While the plane was completed in June, it was not flown until November due to changes, reworks and technical issues that had to be resolved
13) The time taken to go from first test flight to reaching it's top speed and performance capabilities was just over a month
14) From first flight to destruction of the aircraft was 38 months
15) The plane is question had a top speed comparable to many of its contemporaries of the day
16) Since the plane was not produced, there was never any weaponry or hard points installed
17) The plane in question had a ceiling of almost 61,000 feet and a maximum range of almost 2400 miles
18) One of the "legendary" aircraft had side by side seating for the crew while the aircraft in question had tandem seating
19) The "legendary" aircraft was originally designed to have the same mission as the aircraft in question but, due to operational requirements and results of testing, it's mission profile was changed
20) The "legendary" aircraft, other than the seating arrangement, actually looked very similar to the plane in question
21) The manufacturer of the aircraft in question has been around for close to 100 years
Good Luck