R4 says the robot may not start with extensions beyond the frame perimeter, and R2 says the frame perimeter must be made of fixed structural elements, which wheels are not. Does this mean a west coast drive is illegal becase the cantilevered wheels count as a extrusion beyond the frame perimeter?
You’d have to add and upper deck frame to attach your bumpers to. This upper frame would define your frame perimeter.
The FRAME PERIMETER is a virtual vertical extension of the Frame. The WCD drive wheels are inside the ‘Frame’ by definition.
Since the frame perimeter is defined by where a string wrapped around the robot would lie when taught, and that you need frame perimeter backing your bumper, small standoffs such as the robot below would be legal. R26 says you can have 8in gaps between a bumper and it’s backing frame perimeter long wise or 0.25in deep.
In this image, how were the bumpers supported in the corners of the (presumed) rectangle the made up your frame perimeter?
R27 also says that Bumpers must be supported a “minimum of 1/2 at each end”. So, in your picture, the outside of each front and back wheel need a yellow post to support the bumper.
Disclaimer: I found both of the images online and am in no way associated with the teams or robots.
This year, the bot in my previous picture would NOT be legal without some modifications unfortunately since the ends of the bumper must be backed by a minimum of a 0.5in of frame perimeter.
One modification to make this bots bumpers legal would be if one of those standoffs were in each corner of the long face of the bot.
The rules do not state where the fasteners need to be only that the bumpers are backed by frame perimeter.
I should have chosen an image like this instead. The robot below would have be an example of a legal frame to attach bumpers to this year.http://www.buildblitz.com/wp-content/uploads/2014/01/2-cim-in-ballshifter-325in-wheels.png
