My thoughts are that the smaller blade under the same horse power with the same amount of teeth and same tip speed will cut more efficient. It's just that in the twinsaw edger circumstance, forces are being dragged from the larger 'flywheel effected' blade. Could be the difference?
By the way you'ld have to push the circulars blades pretty hard to get it to steer around a knot, typical scenerio means that our blades bog down in the wood before it goes drifting around anything.
Just thought I'd throw my opinions in.
