Legality of Concave Bumpers

So I’m working with my team on brainstorming, and I have the idea to use a concave bumper shape. This has two advantages: It allows the robot to push the Algae into the Processor (with enough force it does work), and it makes for a good way to consistently align the robot in the same spot at the Reef any time we want to seed some Coral, by shoving the robot into the corner of the Reef.
However, while looking through the rules, I found that R101 and R401 sort of ban concave bumpers but in a very subtle way and never specifically mentioning concave bumpers at all. The other bumper rules also seem to use the terms “Robot Perimeter” and “Frame Perimeter” sort of ambiguously.
I was wondering if anyone could help clear up the confusion regarding if concave bumpers abide by R401.

Assumptions:
-Total length of bumpers is less than 120’’
-Total length of rope tied around robot is less than 120’’
-All corners are legal under R406
-Bumper thickness is at least 2’’ everywhere
-No gaps in bumpers

Robot from top down in gray, bumper outer edge in red, and rope in blue

Not legal. Full stop.

In a very subtle way, you might be able to play with some foam thickness in the cross section, but that is speculation on my part… so grain of salt.

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The blue line in your drawing represents (roughly) your ROBOT PERIMETER. You need to have BUMPERS covering the entirety (except for small gaps) of you FRAME PERIMETER. So the BUMPERS would have to follow the blue line, not the red line.

(“Frame perimeter” is gone, it was replaced by “Robot perimeter”)

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Alright, thank you very much for the help.

Similar question but slightly different case. Would bumpers with extended corners be allowed with the new bumper rules?

Minimum thickness would 2.25" and the corners would be a maximum of 4".

Thanks

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Is this a meme

It’s a loophole

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There seems to be room in the rules for adding hard parts on the corners. Think C shaped sections of pipe.

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