Increasing sinew thickness
I recentely finished my horn bellied mollegabet style bow and unfortunately it is too thin in the bending sections...only 35lbs draw weight. I like my bows somewhere between 60 and 70lbs normally so this feels very light.
I'm thinking about adding another 2mm of sinew to try and increase the draw weight. I will pull it into as much reflex as I dare before adding the sinew. I'm hoping to gain 10lbs or so. The bending sections taper from 15.5mm to just under 12mm presently. At the 15.5mm end an increase of 2mm would be close to an 1/8th of the thickness, potentially doubling the draw weight in a wooden bow but of course sinew has low stretch resistance so I don't think I could expect that sort of an increase.
Any thoughts on potential draw-weight increase would be welcomed.
I'm thinking about adding another 2mm of sinew to try and increase the draw weight. I will pull it into as much reflex as I dare before adding the sinew. I'm hoping to gain 10lbs or so. The bending sections taper from 15.5mm to just under 12mm presently. At the 15.5mm end an increase of 2mm would be close to an 1/8th of the thickness, potentially doubling the draw weight in a wooden bow but of course sinew has low stretch resistance so I don't think I could expect that sort of an increase.
Any thoughts on potential draw-weight increase would be welcomed.
2mm added thickness plus more reflex should get you a 50-60lb bow. The limbs will be about 15.75mm thick midway (from the 13.75mm thick now). This is an increase of 15.75/13.75 = 1.145x. 1.145 cubed is about 1.5. So 35lb x 1.5 = 50+lb. More sinew may be needed for a 60-70lb.
Adam
Adam
Many thanks Adam.
I will probably be doing the sinewing tonight.
I am quite pleased how it turned out but as I shaped the 'levers' for a 60lb bow they are rather overbuilt for it in its present state, however it still shoots faster at 35lbs than comparable wooden bows so 'im hopeful that it may shine with some added draw weight.
I will probably be doing the sinewing tonight.
I am quite pleased how it turned out but as I shaped the 'levers' for a 60lb bow they are rather overbuilt for it in its present state, however it still shoots faster at 35lbs than comparable wooden bows so 'im hopeful that it may shine with some added draw weight.