Actually the Gotha Ho-229 you are refering to was to be a fighter. It could only carry about 1000kg of bombs in the fighter/bomber configuration. And several of them were built and flown on test flights. There is an exellent example of it at the Smithsonian Institute. If you go to the X-planes forum here, I have posted several pictures of it and I believe I posted the specifics of it. It was a truely remarkable aircraft. Some people refer to it as the Go-229 but was actually the design of Walter and Reiner Horon so it was given the designation Gotha Ho-229. Here I will post the specifics of it again.
Gothaer Waggonfabrik AG. to Horten design (see note below)
Type: Single seat fighter/bomber
Engines:
Two Junkers Jumo 004B turbojets
Thrust: 1,980lb (900kg)
Dimensions:
Span 16.75m
Length 7.47m
Height 2.80m
Weights:
Empty: 10,140lbs (4600kg)
Max. loaded: 19,840lb (9000kg)
Speed:
607mph (977km/h)
Ceiling:
52,500ft (16,000m)
Range:
1,970 miles (3170km) at 393mph (635km/h) with two drop tanks
Armaments: Planned
Four Mk 103 or Mk 108 cannon
Plus
Two 1,000kg bombs
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Comments:
First flown in January 1945, the Ho 229 was the innovative design of Walter and Reimar Horten, both former Luftwaffe officers. The test programme showed the 229 to have outstanding speed and handling characteristics but developement was halted when US troops overran the research facility. Some dispute has arisen over whether the 229 should be classified as the Go 229 or Ho 229. Since Gothar was supposed to build 229 and didn't really design it, I'm arbitrarily going with the Ho 229 designation in honor of the designers.