That is called a logging arch and it is homemade. The red fixture is a has a pulley for the winch strap, which is routed over the pulley and down between the 2 2X4 maim stringers around the log and hooked on itself. The winch will then be able to lift the log off of the ground to be towed to the desired location. The red pulley fixture has three possible positions for the center of 100", 124" & 148" ( 8' 10' & 12' finished length).Don, that is quite the log trailer you have there. Home made? I can't tell, but it looks like you can lever one end of the log up on the axle, and then pull it forward till the butt end is off the ground.
robo hippy
That is called a logging arch and it is homemade. The red fixture is a has a pulley for the winch strap, which is routed over the pulley and down between the 2 2X4 maim stringers around the log and hooked on itself. The winch will then be able to lift the log off of the ground to be towed to the desired location. The red pulley fixture has three possible positions for the center of 100", 124" & 148" ( 8' 10' & 12' finished length).
That is likely a good guess I know when I lifted it I had the 2 speed winch in low gear and it was still quite a strain to crank.Knowing the end diameter and estimating the other dimensions, the log weight calculator on the woodweb suggests that paper birch might weigh around 2000 lbs. Is the bottom open where you can back over the log before lifting? If you feel like posting a few more pictures from different angle, some might be inspired to make one!