Here is another vid showing a bit of power pushing a trolley (about 40kg) on concrete.
The blade weighs nearly 4kg on it's own(steel) and I think this is the issue for turning as when the blade is off turning is no problem. The new blade will be made from ali and will weigh about 1 kg. I also have put a lipo 14.8v battery on board to try to get better performance. Testing continues.
Paul
http://youtu.be/Fnvhg-ceUqs