I've been looking for the 8RPM one and sure enough this was it. My camera doesn't like to focus properly when it's zoomed in, sorry about that.
http://www.youtube.com/watch?v=Bzl1fdEsyKo
It took the rotator a couple seconds to get going, the audio and video are not unsynchronized.
It is also one of the Thunderbolts heard in that Ames 2005 Tornado Myspace video, after it winds down you can hear the 2001 that took the Sentry's place.
Pictures