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Post by jaydeehess on Aug 6, 2005 9:35:27 GMT -4
Weren't the fenders mounted so that they pivoted with the wheels as they steered? That would apply only to the front wheels though wouldn't it. IIRC all 4 wheels were drive wheels but only the front steered.
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Post by ottawan on Aug 6, 2005 9:37:53 GMT -4
Actually, the rear wheels were steerable as well jaydeehess.
On Apollo 15 the front steering was inoperative and Dave Scott used rear steering only.
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Post by Count Zero on Aug 6, 2005 11:18:41 GMT -4
Actually, the rear wheels were steerable as well jaydeehess. On Apollo 15 the front steering was inoperative and Dave Scott used rear steering only. Only on the first EVA. At the beginning of the 2nd EVA, Dave was able to reset the front steering and it worked for the rest of the mission.
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Post by ottawan on Aug 6, 2005 11:30:57 GMT -4
Correct Count Zero, I should have elaborated
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Post by jaydeehess on Aug 6, 2005 21:43:54 GMT -4
4wd and 4ws , now that's a nice buggy!
I do recall a rooster tail of dirt in one video of the rover though. Don't recall the mission number. The rover is turning sharply to the left and bouncing a fair bit. My thought was that this was the only way it could show a rooster tail as the dirt is thrown to the side and up and not into the fenders. However it also strikes me that the speed of tire rotation would also dictate where the dirt would leave the wheel. Faster travel, faster tire rotation and the dirt's trajectory starts closer to the ground rather than following the tire and getting thrown up into the fenders.
Am I spending too much time on this one HB ?(rhetorical question)
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Post by Data Cable on Aug 7, 2005 4:31:06 GMT -4
However it also strikes me that the speed of tire rotation would also dictate where the dirt would leave the wheel. I would think it would depend on how firmly any individual dirt granule is lodged in the tire mesh, which would dictate how much (centrifugal) force is required to dislodge it.
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Post by jaydeehess on Aug 7, 2005 13:41:51 GMT -4
However it also strikes me that the speed of tire rotation would also dictate where the dirt would leave the wheel. I would think it would depend on how firmly any individual dirt granule is lodged in the tire mesh, which would dictate how much (centrifugal) force is required to dislodge it. I was assuming a consistent coefficient of friction between the tires and the dirt. For varying sizes of particles it would be different as it would if the type of material was not all very similar. It remains though that not all of the surface material that was churned by the rover would go into producing a parabolic rooster tail as the HB 'investigator', Jim Collier claims.
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