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Personnaly I don't know why the majority of teams make claims this early. Minus the few teams who have scrimaged how how your bot will fair is almost impossible to determine.
Suction cups are too finiky. HDPE gets scratched way to easy and will let air into the vacuum. If a team wants to impress me with there suction power they'd have to take 50 grit sand paper to some HDPE(to simulate playing field after a few rounds). Then suction on to it and have the bot hold on to it for 30 seconds.
Saying your bot can push 300lbs isn't accurate either, teams have pulled cars. It isn't the wieght of the object there pulling it the amount of force there pushing/pulling with. Get a spring-scale attach it to a wall and the bot then drive forward take a reading and post that.
Wheel size, tank treads, pnematic tires all act differently on different surafce areas. More surface contact isn't always better, especailly for manueverablilty. It also depends on the wheel material, and this year if you want good traction on all the surfaces then you need more than 1 wheels type.
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