Sumo Bots C

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harryk
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Re: Sumo Bots C

Postby harryk » April 8th, 2011, 1:37 pm

Hey guys,

They just reinstated Sumo for states for Ohio as a trial. My friend and I are using a modified Traxxas rc car@7.2v with some pretty sweet speed (if we back out of the square and floor it at the opposing bot) around 10-20 mph. At ~1.9kg and a strong metal scoop, I would assume that would be pretty effective right? Or is the design flawed by speed? Just wondering, as we didn't have it at regionals.

Tim
That should be enough force to them out the ring, however their are number of problems I've seen happen with this design
1. The most annoying problem is control, fast RC cars generally will have trouble turning and stuff inside the small area
2. Mostly what I've seen is that fast RC cars will just jump over the other bot, especially if the other is a wedge, now you could solve this by having a very low scoop but that leads to the third problem
3. Keeping the scoop on the ground, this will be hard at high speed and if they use a raised ring you are thoroughly screwed if you have a low scoop
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whadk
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Re: Sumo Bots C

Postby whadk » April 9th, 2011, 8:45 am

Hey guys,

They just reinstated Sumo for states for Ohio as a trial. My friend and I are using a modified Traxxas rc car@7.2v with some pretty sweet speed (if we back out of the square and floor it at the opposing bot) around 10-20 mph. At ~1.9kg and a strong metal scoop, I would assume that would be pretty effective right? Or is the design flawed by speed? Just wondering, as we didn't have it at regionals.

Tim
That should be enough force to them out the ring, however their are number of problems I've seen happen with this design
1. The most annoying problem is control, fast RC cars generally will have trouble turning and stuff inside the small area
2. Mostly what I've seen is that fast RC cars will just jump over the other bot, especially if the other is a wedge, now you could solve this by having a very low scoop but that leads to the third problem
3. Keeping the scoop on the ground, this will be hard at high speed and if they use a raised ring you are thoroughly screwed if you have a low scoop
yea,, make sure u don't run straight into the robots that are designed to get u on the top of it. I saw this rc car FLY (by fly i meant actual flying fly) out of bounds in less than 1 second.
RWARRRR :)

tjessberger
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Re: Sumo Bots C

Postby tjessberger » April 9th, 2011, 9:24 am

Yeah, we were concerned about the wedges but we think we've got something to combat it (around the pencil pusher bot strategy for combating wedges @http://www.robotroom.com/NumberTwo3.html). We've maxed the mass of the bot, with a metallic wedge that's flat touching the ground then leads up @around 20 degrees with pencil pusher outward stubs at the top. I would think that'd be pretty solid, but I have no way to test it :? And if we can get to their side of the ring in a second or two, I wouldn't be two worried about control right? I've watched probably 100 sumbot rounds on Youtube and they all seem so so so slow.

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whadk
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Re: Sumo Bots C

Postby whadk » April 9th, 2011, 4:18 pm

Yeah, we were concerned about the wedges but we think we've got something to combat it (around the pencil pusher bot strategy for combating wedges @http://www.robotroom.com/NumberTwo3.html). We've maxed the mass of the bot, with a metallic wedge that's flat touching the ground then leads up @around 20 degrees with pencil pusher outward stubs at the top. I would think that'd be pretty solid, but I have no way to test it :? And if we can get to their side of the ring in a second or two, I wouldn't be two worried about control right? I've watched probably 100 sumbot rounds on Youtube and they all seem so so so slow.
ehh, i don't think it will be enough,,, Bloomington High School South had a robot with just wheels and flat metallic plate.
Also, if ur to get to other people's robot's sides, u have to be REALLY REALLY GOOD AT CONTROLLING.
Ur robot's faster,, but that thing can be ignored. why? here's why. If the opponent's being defensive, even if it's slow, it will turn really fast. The opponent has shorter radius of its turning circle,, (Stuff) so it will turn faster than you think if you're to approach them.
RWARRRR :)

old
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Re: Sumo Bots C

Postby old » April 11th, 2011, 2:16 pm

So what do people do with a wedge if there is a raised ring? If you go out it will be extremely difficult to get back in since the wedge won't be able to climb over anything. I guess you could back in, if you don't have a wedge on the back too, but that could take some extra time and expose you to the full force of your opponent on your most vulnerable end.

I also wonder what the magic test is for "sharp objects" (as in no sharp objects on the Sumo Bot), and if some very sharp wedges are going to be second tiered (or not allowed to compete at all for safety reasons). I saw one team questioned about the sharpness of their "wedge" at a state competition but a team member ran his finger across it and showed that it didn't cut his skin, so they were allowed to continue, but what exactly is the limit of sharpness that we cannot cross?

Finally, I heard that a bot caught fire at a state competition, what happens if your bot catches fire at the national competition due to a motor, esc, battery, overheating? If you have spares, or the burned device doesn't disable you bot would you be able to proceed? I can't see any rule violation, other then the obvious after the fact safety issue, but since there is no way to tell in advance if a bot will burn, even if it did once in the competition, I can't see how you could be taken out for a fire. Event coordinator, any thoughts on this?

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Re: Sumo Bots C

Postby liger_98 » April 11th, 2011, 4:32 pm

for Vex robotics, wats the difference between motor 393 or some thing like that and motor 293?

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sj
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Re: Sumo Bots C

Postby sj » April 11th, 2011, 5:25 pm

So what do people do with a wedge if there is a raised ring? If you go out it will be extremely difficult to get back in since the wedge won't be able to climb over anything. I guess you could back in, if you don't have a wedge on the back too, but that could take some extra time and expose you to the full force of your opponent on your most vulnerable end.

I also wonder what the magic test is for "sharp objects" (as in no sharp objects on the Sumo Bot), and if some very sharp wedges are going to be second tiered (or not allowed to compete at all for safety reasons). I saw one team questioned about the sharpness of their "wedge" at a state competition but a team member ran his finger across it and showed that it didn't cut his skin, so they were allowed to continue, but what exactly is the limit of sharpness that we cannot cross?

Finally, I heard that a bot caught fire at a state competition, what happens if your bot catches fire at the national competition due to a motor, esc, battery, overheating? If you have spares, or the burned device doesn't disable you bot would you be able to proceed? I can't see any rule violation, other then the obvious after the fact safety issue, but since there is no way to tell in advance if a bot will burn, even if it did once in the competition, I can't see how you could be taken out for a fire. Event coordinator, any thoughts on this?
This is just my opinion but for the fire issue i believe that if a bot catches fire.... then first of all the fire needs to be put out which in itself is not something that many event coordinators are prepared for. Just that could end the event if it is bad enough. Furthermore the supervisor could just deem the bot unsafe at that point.. i doubt anyone would argue at that point.

As for the sharp object rule i think the intent was to rule out anything dangerous. Correct me if i'm wrong, but it's seems to be okay to have an edge that is very sharp given that it is against the ground. Of course there are exceptions like if there was a sharp wedge on a car that would travel extremely fast and possibly his a spectator. However i don't believe there is anything inherently wrong with a sharp wedge given that it is not abused. In addition there is no real way to judge sharpness as the competitor may not try too hard to cut them-self, but any thing can cut someone even a "blunt" wedge given enough pressure. Also that should not be the way to judge wether something is too sharp or not. I too would be interested in hearing how this will be judged at nationals because it seems as if many of the competitive bots have sharp edges.
2011 Nationals Results : Sumo Bots 2nd, Helicopters 4rd, Mission Possible 4th, Towers, 9th
WWP SOUTH 3rd At NATS!!!!!

2012 Events: Robot Arm, Towers, Gravity Vehicle

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Primate
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Re: Sumo Bots C

Postby Primate » April 11th, 2011, 6:30 pm

old, if you've got something overheating, that's a serious design flaw and it's probably liable to happen again. With almost every cause--motor leads touching, esc not heatsinked properly, faulty battery--it's usually related to negligent safety precautions.
events 2012 gravity vehicle, robot arm, thermodynamics, tps

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Re: Sumo Bots C

Postby whadk » April 11th, 2011, 6:32 pm

for Vex robotics, wats the difference between motor 393 or some thing like that and motor 293?
I believe that the motor 293 was the two wired motor,,,,
(it should be bigger than 393). If that was correct, motor 293 is stronger (significantly).
For a two-wired motor u don't just plug it into the control module, but u have to use something (wire,,,) that converts it into 3
RWARRRR :)

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Re: Sumo Bots C

Postby austinfhs » April 13th, 2011, 12:32 am

Here's the video with the fire ... it might be someone on the forum so I'm not taking credit for it! (It's not my video)

http://www.youtube.com/watch?v=ia3lFxnl ... ideo_title

I can't believe that there weren't any penalties for it.


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