# 5278C CI7D Reveal

5278C is proud to present our very first CI7D.

We are based in Brookwood High School in Georgia, USA.
Happy to answer any questions you may have!
The hoarder isn’t modeled yet, but it’ll basically just be some standoff railing on the side of the bot.
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That indexer is giving me ideas.

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Yeah, that’s probably the most preliminary part on our bot right now. It’s got a vision sensor “upstream” to detect opponent color and auto-sort for our driver.

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great CAD! I wonder if x drives will be meta…

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Thank you! We decided on an X drive because of the versatility it provides. With very few balls on the field, we want to be able to quickly maneuver to get them.

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I hope so. That is what we are thinking of building…

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Same, I’m also looking to run an X Drive, because you can move in any direction and you also get extra speed without needing gear ratios

Building it is my only issue right now. I hate cad and cad seems to hate me back

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There is this alternative to traditional CADding that is coming out soon. Maybe you can sign up for the beta and give it a go?

I asked him but he says it is not official yet but when it is I shall be the first to use it. [insert evil laugh here]

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I never experimented much with X drives, how are X drives faster than normal tank drives? and is it by a lot?

They are sqrt(2) ~= 1.41 times faster and have 1.41 times less pushing force, compared to the regular drive.

Total power of the motors do not change, but you get different effective gearing ratio by having wheels at 45 deg angle.

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Could you explain to me how you calculated this?

I’d also like to know the calculation

I don’t fully understand why it’s faster, but I found this website: https://aura.org.nz/why-is-x-drive-faster/

The sqrt(2) comes from the 45 degree angle of the wheels, so the force vector is angled at 45 degrees, and then if you do some right triangle calculations, it’s just a 45 45 90 triangle.

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Thanks

I think X drives could be viable, but the biggest tradeoff is the lack of any pushing power. The wheels angle won’t allow the robot to do well in pushing matches, I guess we’ll see which becomes more important

With x drive, I’m planning to use my maneuverability and speed.
My strategy is to gain speed and then ram the opponents side, using my momentum to slam them around the field.

Is that level of offense legal? Also if you did that there is a likelihood that you’ll damage your own robot…

maybe if it is a collision where both robots are going full speed and hit the most vulnerable part of the robot

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