posted on Dec, 7 2007 @ 07:21 AM
Look at the schematic on this page, it shows that the oxidizer is going to be
consumed in the combustion chamber, even before the engine bell itself. It’s expanding gases that are coming out of the bell more so then actual
flame in a zero atmosphere environment. Those gases may be hot enough to ignite something and cause charring if there was a oxidant in the atmosphere,
but not so in zero atmosphere. Also it should be noted that the LEM did not hover for a long period of time over the landing spot, it actually made a
bit of a swath in the loose dust as it came down on an angle. The LEM itself only weighed about 6K in the lunar atmosphere and not many Lbs of thrust
were required to keep a safe vertical descent rate.
As to what I mean by atmospheric gases, if you had a blow torch (that contained a fuel and an oxidizer) on the moon and you pointed it at a candle,
the wick would not ignite as there is no oxygen around the wick to support a flame. The flame on the torch would stay lit as it burned the mixture of
fuel/oxidizer in the torches stream of gas, and it would provide heat, but not ignition of something outside the stream. I say gases because there are
other gases which work as oxidizers besides oxygen, though on earth oxygen is the most common. it’s a bit hard to try and explain, and I am getting
to tired to think clearly, so let me know if that still does not make sense.
Slightly off topic, but free educational simulators relating to the Apollo program:
This one will give you an idea of how an approach was angled and how little time was spent hovering over any one point:
Eagle Lander 3D
Another excellent free space flight simulator for learning basic orbital mechanics and such:
Orbiter
Beginners guide:
Go Play in Space
edit to add:
Also I should mention that a rock that is thrown into a fire is not generally going to char anyway (do not try this at home as it may explode do to
water in the rock!), the char marks you see after a ground fire are secondary fires from things either on or in the soil itself. So like if I lit a
camp fire and ring it with rocks, those rocks do not turn black, other then with soot from the smoke. The black that is left after the fire is
extinguished is from grass, twigs, and other things in or on the soil that burned, and from the wood/fuel of the fire itself. Also heat will remove
water from certain stones, but I don’t believe that there is much water content in moon rock.
[edit on 12/7/2007 by defcon5]