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Riding on the moon(12 posts)

Riding on the moonmr_spin
Dec 10, 2001 3:56 PM
So, I'm listening to the classic Police song "Walking on the Moon" during a commercial for some car. It occurs to me that someday, I could be RIDING on the moon (yeah, right).

Now, considering that the moon has only 16% of the gravity of Earth, I'm going to need some much smaller gears. I would be hopelessy spun out in a 39x23 climbing the equivalent of L'Alpe d'Huez on the moon.

Clearly there is a limit to how small the gears can go. It would be impossible to create a 1-tooth cog, for instance. And increasing the chain ringd to compensate has its limits, too. Can you imagine how big a 70-tooth ring would be?

So what do we do? Add levers and pulleys? Eliminate the chain drive altogether and go to a drive shaft and gearbox? Hopefully, bikes won't become obsolete, so there has got to be a way.
yep, shaft or belt driven. but, this is bike-related! d'oh! nmJs Haiku Shop
Dec 11, 2001 6:38 AM
sorry, forgot where I wasmr_spin
Dec 11, 2001 8:04 AM
Inspiration struck, and this is where I was....
compound gearsDog
Dec 11, 2001 6:41 AM
if you needed really high ratio gears, you'd probably have to go with a compound arrangement; a normal derailleur setup plus an internal geared hub would work; an intermediary gearset on a jackshaft would work, too
No neeed.muncher.
Dec 11, 2001 7:37 AM
Once we have put in all the stuff we learned by screwing up building roads on earth, we would have nice smooth ones up Alpe D'Lune. So, you just have a very tall bike (jumping on/falling off not an issue of course) to get a very big ring to small rear cog, get up to about 70 on the flat (no wind/drag etc), and coast right on up :-)
but... breathing?Dog
Dec 11, 2001 8:05 AM
While gravity there is 1/16 that of the Earth, there is no air. So, you'd have to carry your own; anyone care to calculate how much air you'd need for a century, and how much a container would weigh to haul it around? I'd bet you end up worse off than on Earth. You might still need those low gears to get going or get up hills.

Dec 11, 2001 8:42 AM
You'll just get a couple of spare mini cyclinders for your TopPeak BreathEasy Compact to go with your CO2 ones that you have at the moment - let's not ruin the fun :-)
breathe deep, but stay coolmr_spin
Dec 11, 2001 9:43 AM
With much less gravity and almost no wind resistance, your exertion would be less, requiring less air. Right before the crew of Apollo 14 left they moon, Alan Shepard hit drove a golf ball on the moon that in theory flew hundreds if not thousands of yards. It's hard to say because he didn't get a good swing. And they didn't go look for the ball. But with less air resistance and fractional gravity relative to Earth, a well hit golfball could have flown for miles.

The real problem is heat and cold. I'm sure you've seen pictures of the Apollo astronauts on the moon with big packs on their backs, and getting in the rocket carrying a briefcase with a tube. The bulk of what they are carrying is air conditioning. Without AC, astronauts would rapidly overheat in space and on the moon. Basically, they would cook like a turkey. And at night and especially on the dark side of the moon, it's well below freezing. The expansion and contraction of materials in those kinds of conditions would probably render the tight tolerances of a high end frames and components useless. Not to mention all the dust.

Riding on the moon is probably a bad idea. I'll stick to earth for now.
Yeah - silly idea, you'd have to be a...hang on a mo!....nmLunatic
Dec 11, 2001 9:56 AM
rollers would be cool, though nmDog
Dec 11, 2001 10:06 AM
Watch out for Moon Dawgs...Me Dot Org
Dec 13, 2001 11:05 AM
...I wonder: do they howl at the earth?
and moon rednecksmr_spin
Dec 13, 2001 1:02 PM
With so little air, when the moon dawgs howl, do they make a sound?

That reminds me. We'll probably still get run off the road by rednecks in lunar rover SUVs.