I'm new in making a crossbow but i came far. Here are the resultes that i have now.
But i came at a problem about the bow itself i don't now what the measurements are.
I want to build a composite wooden prod for a crossbow. I have experience building laminated flatbows but I am not sure about the sizes and materials for making a crossbow prod.
I have a 5mm hickory strip available which is quarter sawn for the back of the bow, I want to use massaraduba aka bulletwood (Manilkara bidentata) for the belly of the bow since it is strong in compression. Do you think this is a good combination? I will use titebond III for the glue up. This combination of woods&glue sure works on long/flatbows.
I did some browsing on the forum and I calculated that the length of the prod should be 3 or 4 times the length of the arrow groove/stroke. Am I right? Is there a formula for calculating the correct length of the prod? What draw length/stroke is normal for a medieval crossbow (12 inch/30,5cm)?
We are aiming for a prod of 40/50# any suggestions about the with of the prod and thickness? When gluing should we glue the prod straight or glue in some deflex (bend towards the bowstring)
We would like to hear your input.