I looked in the Spin up game manual (R7) and it states that:
Certain non-VEX components are allowed. Robots are allowed the following additional “non-VEX” compnents:
e. An unlimited amount of rope / string, no thicker than 1/4 " (6.35)
Does this mean I could use string for the end game to have nearly unlimited expansion?
Everything which you place on the field in a match counts as part of the robot for all purposes. (subject to all rules and notes in the game manual) Which would indeed include string.
but can you release the string without using pneumatics or just by using a motor.
Like l have a design about a pin mechanism in which the string is connected to a shaft and when it is pulled, the launcher springs forwards but it seems like that most expansion uses pneumatics to release it.
I think you could just use a catapult though it might be a waste of motors. The problems with Pneumatics for me is that my school has run out of tanks & pistons.
(Kinda sucks) We have to wait till approximately November to get more.