Delta IV Heavy Upgrade 48 t

American orbital launch vehicle. Proposed upgrade to Delta IV Heavy by adding 4 GEM-60 solid rocket boosters, RS-68 Regen upgraded engines with regeneratively-cooled nozzles to the core vehicles, cryogenic propellant densification, and cryogenic propellant cross-feed between the strap-ons and core. 6.5 m diameter payload fairing. Introduction would require modifications to existing launch pads.

LEO Payload: 43,000 kg (94,000 lb) to a 407 km orbit at 28.50 degrees. Payload: 15,800 kg (34,800 lb) to a earth escape.