Here is a summary of the key dimensions of the Hub in FIRST’s 2022 game, Rapid React. For the official measurements and updates go to https://www.firstinspires.org/resource-library/frc/competition-manual-qa-system
Location
The Hub is essentially a ginormous cube (8’11”x8’11”x8’x8” tall) located in the center of the field.
Parts
The upper hub is a polycarbonate funnel sitting at the top of the hub. The top edge is 104 inches off the ground and the opening is 48 inches in diameter. The top edge has an outer diameter of 53.375 inches covered in 5 inch retro reflective tape spaced 5.5 inches apart. The inside of the hub has ~66” slope and is ~36 inches deep.
The lower hub is a second funnel with the top edge 41 inches off the ground and has an opening that is 60.125 inches in diameter. There are also #2 black plastic chain hung 7.5 “ below the opening of the lower hub.
The upper exits are 4 ramps that have the ends 67.125 inches off the ground and extend 9.75” past lower exits (65.75 inches from the center of the hub)
The lower exits are 4 ramps the allow cargo from lower hub to exit on the ground. They extend 56” out from the center of the hub.
The fenders are 46.125 inch x 22.5 inch tall walls that are situated between the lower exits. The front of the fender is 3.8 inches back from the lower hub wall, 7.2 inches from the upper hub vision target ring, 9.89 inches back from the inner edge of the upper hub.