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Unread 10-01-2013, 16:07
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Re: About the C-Base angle structure and bumpers

Code:
R22

ROBOTS are required to use BUMPERS to protect all outside 
corners of the FRAME PERIMETER. For adequate protection, 
at least 8 in. of BUMPER must be placed on each side of 
each outside corner
I doubt the OP drawing follows the intent, or the letter of the rules. The two things on the indented part are not bumpers, according to R24, so there are no bumpers on one side of each corner of the robot on that end.

Code:
R24

BUMPERS must be constructed as follows (see Figure 4-4):

.....

E.   must attach to the FRAME PERIMETER of the ROBOT .....
The "inside bumpers" are not attached to the FRAME PERIMETER, are they?

Refer to the "blue box" in R02:

Code:
To determine the FRAME PERIMETER, wrap a piece of string 
around the ROBOT at the BUMPER ZONE described in R25. The 
string describes this polygon.