On Tue, 5 Apr 2011 15:36:20 -0400, Jeff Findley
wrote:

It's going to be a big launcher, capable of launching a 53,000 kg
payload into an orbit of 28.5 degrees inclination at 200 km altitude.

Yes, but what payloads need that capacity anytime in the next decade?
Three giant GEO satellites at the same time? Good luck scheduling
that.

http://www.spacex.com/falcon_heavy.php

The most interesting (new) feature I see is "propellant cross-feed from
the side boosters to the center core". This has never been done on any
launch vehicle to date, so it will be very interesting to see how
easy/hard it will be for SpaceX to get this to work.

It hasn't exactly been done, but Atlas had something like it with its
"stage and a half" engines that had to have severable connections to
tankage in flight (and that was in 1959), and Saturn IB had multiple
propellant tanks that had to pump around fuel in-flight (but they were
all integrated as one unit, not hanging off the side of a core.)

It's about damned time someone implement crossfeed. Delta IV-Heavy
could do it, but it's probably too little, too late for Delta. It's
toast if Falcon Heavy even comes in 100% overbudget.

Brian