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Post by the light works on Jul 1, 2013 14:34:56 GMT
there were long overwrought threads on this topic on the old board, and while some people would never give up their pet theories, most of us agreed in the end that a bicycle operates by following ALL of the rules of physics, not just one or two. however, it occurred to me yesterday that it might be fun to devise a series of tests engineered to isolate all of the major forces at play, to view what happens when you eliminate or restrict to only one force at a time. the first test I came up with is a test to demonstrate the prevalence of countersteer; consisting of sensors applied to the headtube and wheel of a bicycle. a test subject rides the bicycle through a basic obstacle course; and the data on distance and steering motion is loaded into a robot simulator, which travels the same route, but with the steering angle exaggerated. a wide front wheel, and a narrow back wheel loaded with paint would provide a track which could be viewed to show which direction the front wheel turned at every point on the track.
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Post by silverdragon on Jul 2, 2013 6:35:23 GMT
I will jump in with a visit to the Vomit Comet, and ask can you ride a bike without Gravity.....
Of course, you will loose all contact with the ground, so no progress, but could you still go through all the motions of pedalling whilst under zero gravity?... Fun to test whilst on that parabolic dive plane?...
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Post by the light works on Jul 2, 2013 13:11:07 GMT
I will jump in with a visit to the Vomit Comet, and ask can you ride a bike without Gravity..... Of course, you will loose all contact with the ground, so no progress, but could you still go through all the motions of pedalling whilst under zero gravity?... Fun to test whilst on that parabolic dive plane?... apparently NASA is way ahead of you. except it looks like a recumbent. www.space.com/6439-space-exercise-bike-breaks.html
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Post by the light works on Jul 2, 2013 13:11:27 GMT
they also did essentially the same thing in underwater bicycle.
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Post by silverdragon on Jul 12, 2013 8:19:27 GMT
I noted that with interest...
The Space exercise bike, it was tied down?....
Now the Underwater Bike.... That floated about a bit, much like I already expected with zero gravity, but, interestingly for Zero Gravity, the balance thing went totally out as well....
So part of balancing a bike is the force you get from the tyres grip..... Once you loose that, the pivot point of balance changes?... Instead of using the tyres grip to balance the thing, you are using centre of gravity, which is much higher?... I hadnt though of that.
You learn something new every day.....
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Post by the light works on Jul 12, 2013 14:15:19 GMT
I noted that with interest... The Space exercise bike, it was tied down?.... Now the Underwater Bike.... That floated about a bit, much like I already expected with zero gravity, but, interestingly for Zero Gravity, the balance thing went totally out as well.... So part of balancing a bike is the force you get from the tyres grip..... Once you loose that, the pivot point of balance changes?... Instead of using the tyres grip to balance the thing, you are using centre of gravity, which is much higher?... I hadnt though of that. You learn something new every day..... I would expect the space bike, itself, was bolted down, to prevent it wandering about the cabin.
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