Ok, us kids, me being 18, building robots for many year, and learned from others and experience in engineering know that using a compressor in a system without a pressue switch is not a good idea for atleast 3 reasons.
1. The compressor will burn out.
2. this results in very high costs every battle
3. will not do the batteries any good what so ever (as everbody knows a stalled motor Absolubtly drinks power).

And its not the age that matters, its the experience, and as i beleive (actually i know) dave has had hands on experience with these types of systems for the last 4 years in MANY different robots.