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Question about Apollo Lunar Module
My friend's friend is one of those people who think that we never landed on moon and his reasoning is that the ascent stage of Apollo Lunar Module did not have enough fuel and/or power to lift-off from moon.
I found these specs on wiki: http://en.wikipedia.org/wiki/Apollo_...e#Ascent_stage APS propellant mass: 5,187 lb (2,353 kg) APS engine: Rocketdyne RS-18 APS thrust: 3,500 lbf (16,000 N) APS propellants: Aerozine 50 fuel / nitrogen tetroxide oxidizer APS pressurant: two 6.4 lb (2.9 kg) helium tanks at 3,000 pounds per square inch (21 MPa) APS specific impulse: 311 s (3,050 N·s/kg) APS delta-V: 7,280 ft/s (2,220 m/s) Thrust-to-weight ratio at liftoff: 2.124 (in lunar gravity) I managed to prove to him that it did have enough power to lift-off based on the 2.124 thrust-to-weight ratio but couldn't do anything about his "not enough fuel" theory. How can I prove that 2353 kg fuel was enough? Last edited by eddman : July 20th 11 at 09:20 PM. |
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Question about Apollo Lunar Module
On 07/20/2011 09:38 PM, eddman wrote:
My friend's friend is one of those people who think that we never landed on moon and his reasoning is that the ascent stage of Apollo Lunar Module did not have enough fuel and/or power to lift-off from moon. I found these specs on wiki: http://en.wikipedia.org/wiki/Apollo_...e#Ascent_stage APS propellant mass: 5,187 lb (2,353 kg) APS engine: Rocketdyne RS-18 APS thrust: 3,500 lbf (16,000 N) APS propellants: Aerozine 50 fuel / nitrogen tetroxide oxidizer APS pressurant: two 6.4 lb (2.9 kg) helium tanks at 3,000 pounds per square inch (21 MPa) APS specific impulse: 311 s (3,050 N·s/kg) APS delta-V: 7,280 ft/s (2,220 m/s) Thrust-to-weight ratio at liftoff: 2.124 (in lunar gravity) I managed to prove to him that it did have enough power to lift-off based on the 2.124 thrust-to-weight ratio but couldn't do anything about his "not enough fuel" theory. How can I prove that 2353 kg fuel was enough? Compare the APS delta-V against the delta-V required for low lunar orbit. Even accounting for gravity losses, it's more than enough. |
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