We too were thinking of using this as a method of kicking the balls, however <R53> states:
Quote:
<R53> Items specifically PROHIBITED from use on the ROBOT include:
A. Electric motors and/or servos different from, or in addition to, those in the KOP, with the exception of those specifically permitted by Rule <R52>.
B. Electric solenoid actuators (note: electric solenoid actuators are NOT the same as pneumatic solenoid valves – the latter are permitted, the former are not).
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The bold text highlights the use of electric solenoids.
However, there is one way that might be viable, which is if the solenoid is built in house. I am in no way the GDC so you would have to post an official Q&A question, but based off of a ruling made for 272 in 2008, I know that the electromagnet they made on there robot was legal because it was a custom electronic piece made by them.