it's unlikely you will be able to break the limits lugs by hand. the smallest electric or petrol dragger will do your job. failing finding a dragger, find a very small (like a kids one) 50cc 4 wheeler motorbike to do the job. great fun on the airfield if the weathers too crap to fly too
here's a new one:
http://cgi.ebay.co.uk/QUAD-BIKE-50cc...QQcmdZViewItem
or 2nd hand with reverse:
http://cgi.ebay.co.uk/quad-bike-150c...QQcmdZViewItem