Thanks very much for the info that should help. I got the variable pitch props several years ago from a company called raboesch hobby products out of zeewolde holland. If you go to my website www.jonesmountaintugworks.4t.com and check out whats new page you can see how the variable pitch are controlled by two servos, also I am using a robards air plane retract system to create a realistic under the ice bubbling system. I bored out the control valve so it can discharge the whole air resevoir in one shot, pretty cool hey.
Thanks again
TUG