Duct fans

[Alex.q]

I don't know how effective they were providing thrust, but I think our human player that year mentioned that the fans (if positioned higher up on the robot) would slighty throw off his aim when throwing the orbit balls.

[Daniel_LaFleur]

1729 used 2 16" props (shown here).

They were incredibly effective and allowed us to pin our opponent during autonomous and have our human player fill their trailer at his convienience.