Re: CIRCULAR TILLER BOWS AND DRAWING AN ACCURATE BACKING BOA
Posted: Fri Sep 11, 2015 7:36 pm
Dennis,
Every time I think about circular tiller I keep coming back to the point of the relationship between the length of a radian and the draw length of the archer.
I cannot vouch for the accuracy of the illustration used by Horace Ford; the bow length would appear to be less than two radians but as it conforms to part of a circle we cannot refer to it as elliptically tillered. In the following image the blue and the black lines are of equal length. As you can see the red line indicating the curve of a bending bow limb is longer. I believe the point of intersection of the green arc is not correct. I think the only way to get the true path of travel of the limb tips would be to attach pencils on the tips of the limbs and bring the bow to full draw on the tiller board thus marking the tips travel on the board.
Daryl.
Every time I think about circular tiller I keep coming back to the point of the relationship between the length of a radian and the draw length of the archer.
I cannot vouch for the accuracy of the illustration used by Horace Ford; the bow length would appear to be less than two radians but as it conforms to part of a circle we cannot refer to it as elliptically tillered. In the following image the blue and the black lines are of equal length. As you can see the red line indicating the curve of a bending bow limb is longer. I believe the point of intersection of the green arc is not correct. I think the only way to get the true path of travel of the limb tips would be to attach pencils on the tips of the limbs and bring the bow to full draw on the tiller board thus marking the tips travel on the board.
Daryl.