Rocket League: Vulcan gameplay Hagawobla. Rocket League gets the player tempted to win with the challenge of the controls but so much fun,and there's NOTHING wrong with Rocket League!!!!! 57 out of 70 people found this helpful. The first stage propellant tanks share the diameter of the Delta IV Common Booster Core, but will contain liquid methane and liquid oxygen propellants instead of the Delta IV's liquid hydrogen and liquid oxygen. Loading ... VULCAN NEW ROCKET LEAGUE CAR - CUSTOMIZING THE VULCAN ROCKET LEAGUE RUMBLE FUNNY MOMENT & FAILS - … G Vulcan is ULA's first launch vehicle design, adapting and evolving various technologies previously developed for the Atlas V and Delta IV rockets of the USAF's EELV program.