The Falcon Heavy won't surpass NASA's Saturn V moon rocket, still all-time king of the launch circuit. It won't even approach the liftoff might of NASA's space shuttles.
But when it departs on its first test flight, as early as Tuesday, the Heavy with its three boosters and 27 engines will be the most powerful working rocket out there today, by a factor of two.
Picture SpaceX's frequent-flyer Falcon 9 and its single booster and then times that by three; the Heavy's three first-stage boosters are strapped side by side by side.
With more than 5 million pounds of liftoff thrust, equivalent to 18 747s jetliners, the Heavy will be capable of lifting supersize satellites into orbit and sending spacecraft to the moon, Mars and beyond.
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Using another airplane analogy, SpaceX boasts a Heavy could lift a 737 into orbit, passengers, luggage and all. The company already has some Heavy customers lined up, including the US Air Force.
"I can't wait to see it fly and to see it fly again and again," said the Southwest Research Institute's Alan Stern.
Cape Canaveral hasn't seen this kind of rocket mania since the last space shuttle flight in 2011. Huge crowds are expected for the afternoon launch from Kennedy Space Center.
Visitor center tickets for the best up-close viewing, called "Feel the Heat" and "Closest Package," sold out quickly.
"When you're talking about what would be the biggest and largest operational launch vehicle in the world, that adds another dimension of excitement," said Phil Larson, an assistant dean at the University of Colorado at Boulder, who used to work for SpaceX and the Obama administration.
But for this inaugural flight, the rocket will carry up Musk's cherry-red Tesla Roadster. In addition to SpaceX, he runs the electric car maker Tesla.
"Red car for a red planet," Musk tweeted in December, when announcing the surprise cargo.
Fresh-off-the-drawing-board rockets typically carry steel or concrete blocks in place of true cargo.
"That seemed extremely boring," Musk explained. NASA officials said the Falcon Heavy is just the latest evidence of the Kennedy Space Center's transformation into a multi-user spaceport, a turnaround after decades of space shuttles taking center stage.
Blue Origin, led by Amazon's Jeff Bezos, for instance, is developing a big, reusable orbital-class rocket named New Glenn after the first American to orbit the world, John Glenn.
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