I started building a RDT crossbow, and problem after problem arises. But I am determined to overcome them all, maybe with some help of fellow bowyers all over the world!
Besides the cams being too small (I could not make them large enough form the 10 cm wide aluminium plate I bought) the main problem now is the following:
For the limbs (do you call it prods?) for my RDT project I considered 3 options:
1. Laminate; 2. Fiberglass rods molded in Expoxy; 3. Steel.
I started to try the laminate. For the 40 cm (15 3/4 inch) long limbs I glued together (sail battens);
1. 3 mm glassfiber (from sail-boat);
2. 5 mm bamboo;
3. 4 mm yew sapwood
4 4 mm yew heartwoord
5 1 mm bo - tuff.
I still have to cut out a V-shape in the middle where the cams come inbetween, but the whole is incredibly stiff. When I stand on it, it hardly bends half an inch..
For the epoxy I used an industrial epoxy (BISON Kombi PRO XL, strong repair). I know epoxy EA 40 is often recommended.
Can the immense rigidity be caused by the wrong type of epoxy, or will the amount and thickness of the layers be the cause?
Last edited by FrenckBrambo on Mon Jan 09, 2017 6:48 am; edited 1 time in total