Delta IV Heavy Upgrade 67 t

American orbital launch vehicle. Proposed upgrade to Delta IV Heavy by clustering seven common booster modules, and using an AUS-60 upper stage powered by 2 MB-60 or RL-60 27 metric ton thrust LOx/LH2 engines. A payload fairing over 6.5 m diameter could be accommodated. Introduction would require new launch pads and booster assembly infrastructure.

LEO Payload: 61,000 kg (134,000 lb) to a 407 km orbit at 28.50 degrees. Payload: 22,500 kg (49,600 lb) to a earth escape.