Yeah, it was the BMW 003's that were too big, the Jumo 004's were the more reliable then, but the initial trials were very well received, take-off speed of 95 mph in just 500 yds, and 497 mph level speed was recorded - One of the jets cut-out and that one crashed, but with at least 3 other prototypes developing, they were over-run by the Allies...Interestingly, the project really started developing when German Intelligence discovered what the Northrop Corporation was doing, which got RLM behind them forming Sondercommando 9, which kept Technischen Amt out of it. One of the Horten brothers married Ernst Udet's secretary, which lent a lot of weight to their efforts, and eventual Goering heard of it and was delighted by it's uniqueness, so he was behind it too....Manufacturers estimations gave it a max speed of 607 mph at 39,000 ft, range 1180 miles, AUW 16,550 lbs normal, and 4,330 ft/min climb rate, max ceiling 52,500 ft. - US troops got to the Friedrichsroda plant first, so the technology must've gone Stateside....