I made a single flywheel for pitching in as a demo to some students I’m mentoring and it was a nightmare. Besides the main flaw of being relatively inaccurate compared to a double flywheel, IQ doesn’t have legal lexan or anti-slip mat so the only way to make a hood flywheel legal is to use hexbug plastic sheets that @CautionTape has used.
I think a double catapult is much much better than a single or double flywheel