The Falcon Heavy is currently in development and builds off of the Falcon 9 first stage and the Merlin 1D engine, an upgrade of the engine currently flying on the Falcon 9."
Link to Original Source
We've improved Slashdot's video section; now you can view our video interviews, product close-ups and site visits with all the usual Slashdot options to comment, share, etc. No more walled garden! It's a work in progress -- we hope you'll check it out (Learn more about the recent updates).
Simplicity does not precede complexity, but follows it.