Elon Musk says successful maiden flight for Falcon Heavy unlikely

Development of the booster rocket, which is powered by 27 engines, has proven to be "way harder than the team initially thought," he told the International Space Station Research and Development conference on Wednesday.Falcon Heavy will be the most powerful rocket booster in the world, capable of delivering a 54 ton payload into orbit.Musk said that combining three Falcon 9 rockets together had multiplied vibrations throughout the vehicle making it difficult to test without a launch.