Comet HLLV

{{Short description|Proposed super heavy-lift launch vehicle designed for NASA's First Lunar Outpost program}}

{{no orbit for payload}}

{{Infobox rocket|image=FLO_Comet_HLV_Verticle.jpg|caption=Artist's impression of a Comet HLLV being rolled out of the VAB|name=Comet HLLV|function=Crew / Cargo Launch Vehicle|country-origin=United States|height={{convert|410|ft|m|abbr=on}}|diameter={{convert|11.5|m|ft|abbr=on}}|stages=3|capacities={{Infobox rocket/payload

|location = LEO

|kilos = {{convert|254400|kg|lb|abbr=on}}

}}

{{Infobox rocket/payload

|location = TLI

|kilos = {{convert|60600|-|97600|kg|lb|abbr=on}}

}}|status=Proposed and cancelled|sites=Kennedy Space Center|stagedata={{Infobox rocket/Stage

| type = booster

| stageno = F1-A booster

| length = {{convert|155|ft|abbr=on}}

| diameter = {{convert|260|in|abbr=on}}

| empty = {{convert|75678|kg|abbr=on}}

| propmass = {{convert|985368|kg|abbr=on}}

| engines = 2 Rocketdyne F-1A

| thrust = {{convert|16013|kN|lbf|abbr=on}}each on sea level

| fuel = RP-1/LOX

}}

{{Infobox rocket/Stage

| type = stage

| stageno = First

| length = {{convert|160.4|ft|abbr=on}}

| diameter = {{convert|33.0|ft|abbr=on}}

| empty = {{convert|209030|kg|abbr=on}}

| propmass = {{convert|2729770|kg|abbr=on}}

| engines = 5 Rocketdyne F-1A

| thrust = {{convert|40050|kN|lbf|abbr=on}} sea level

| fuel = RP-1/LOX

}}

{{Infobox rocket/Stage

| type = stage

| stageno = Second

| length = {{convert|103|ft|abbr=on}}

| diameter = {{convert|33.0|ft|abbr=on}}

| empty = {{convert|60767|kg|abbr=on}}

| propmass = {{convert|634439|kg|abbr=on}}

| engines = 6 Rocketdyne J-2S

| thrust = {{convert|7750|kN|lbf|abbr=on}} vacuum

| fuel = LH2/LOX

}}

{{Infobox rocket/Stage

| type = stage

| stageno = Translunar Injection

| length = {{convert|55.6|ft|abbr=on}}

| diameter = {{convert|33.0|ft|abbr=on}}

| empty = {{convert|21336|kg|abbr=on}}

| propmass = {{convert|135392|kg|abbr=on}}

| engines = 1 Rocketdyne J-2S

| thrust = {{convert|1180|kN|lbf|abbr=on}} vacuum

| fuel = LH2/LOX

}}}}The Comet HLLV was a proposed super heavy-lift launch vehicle designed for NASA's First Lunar Outpost program, which was in the design phase from 1992 to 1993 under the Space Exploration Initiative. It was a Saturn V-derived launch vehicle with modernized engines, stretched fuel tanks, and strap-on boosters. Its main goal was to support the First Lunar Outpost program and future human mission to Mars. It was designed to be inexpensive and simple while relying on existing technology to lower development costs.