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#1
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<R06>
with all this ruling on behalf of the GDC I guess we ore not even allowed to pick up moonrocks anymore, because that would increase the normal force. by carrying balls in a hopper you will increase your normal force. Also does that mean a shooter is out since accelerating a ball up will also increase your normal force?
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#2
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Re: <R06>
I think your reading into it too much. The GDC understands that some actions during the normal playing of the game will increase your weight and traction at various points IE Picking up Moon Rocks.
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#3
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Re: <R06>
Let me quote <R06> so that we have some reference here.
Quote:
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#4
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Re: <R06>
Quote:
http://forums.usfirst.org/showthread.php?t=11025 Quote:
Quote:
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#5
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Re: <R06>
Quote:
Even non-tractive wheels (i.e. within a small percentage of the rover wheels) are allowed for purposes of data gathering only. |
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#6
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Re: <R06>
could the GDC rule that your maximum wieght be 120lbs, when you are full or moon rocks. for example if we weighed 119lbs, off the field then could we only pick up a certain number of moon rocks so that we would never be more then 120lbs. (not including bumpers and batteries) then a lighter robot say 115lbs could pick up more then the heavier robot? or does the maximum volume deminsions not include the weight of your payload. I am asking this becase of the recent ruling about the net bieng used to hold the orbit balls.
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#7
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Re: <R06>
Quote:
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#8
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Re: <R06>
Quote:
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#9
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Re: <R06>
Quote:
That and the game pieces aren't robot parts. |
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#10
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Re: <R06>
I don't quite understand the big deal about making the robot heavier... while an increased normal force may improve traction, it won't help accelerating and braking-- if your robot is heavier, it is that much harder to accelerate. I suppose the only advantage is if another robot were to push you, then it would take a larger force to break static friction. I think that the only reason it seems to improve acceleration is that it slows down the motor speed, bringing it below the threshold of breaking static friction (g*u_s). On the other hand, using idler wheels for the purpose of getting robot motion data may waste the weight that it would have driven otherwise... the other wheels must still pull that load.
Hike Danakian, Reseda Regents Robotics (2584) |
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#11
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Re: <R06>
Quote:
In other words: F = u*N = u*m*g F = m*a The "m" in the top line does not include the mass of the trailer. The "m" in the second line does Last edited by Jared Russell : 20-01-2009 at 13:25. |
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#12
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Re: <R06>
The big deal about making the robot heavier, is that you have to accelerate the mass of the robot AND trailer, but you only have the tractive force of the robot wheels to do it. The higher the percentage of total weight that's on the robot wheels, the higher your acceleration can be.
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#13
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Re: <R06>
Incidentally, the GDC has clarified that "normal" actions such as handling the orbit balls are perfectly legal even though they increase the normal force slightly, while actions intended purely to increase the normal force are illegal.
http://forums.usfirst.org/showthread.php?t=11275 |
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#14
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Re: <R06>
I think all that FIRST is saying is they don't want people intentionally trying to gain force or traction. The point of the game is to score points in trailers without much traction, not to figure out how to get more traction so you can score more points.
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#15
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Re: <R06>
Quote:
The ruling with the net occurred because the net could expand beyond the maximum volume dimensions of the robot, not because of any added weight concerns. |
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