Thanks, but it will be a little while yet for the slingshot, but perhaps we can speed it along. JoergS mentioned wanting to build a smaller one. I still have the first one I built from a coathanger just wanting to get the general shape of my first prototype.
JoergS has already got a design the Gloveshot that is almost identicle to my first with the exception of the swinging arms etc, it which worked pretty good with ordinary elastic bands,outshooting a crappy pistol crossbow.
If he'd like to work with that and is something you guys would like to own, perhaps that can be my introductory model? My big slingshot is intended to be more archery oriented in the way it is held and shot, and the extended forks really kick out some extra juice. Most folks here like the compactness of a reg. slingshot, so perhaps a smaller one is he way to go.
I suggestion is to make the lower main arm so that when drawn, an arrow can be rested there. I used a bit of plastic attached to the tip of the arm (detachable). When released the arrow rest simply swings away. I can help with details to max. speed. With a string,overall the best ratio for a wide variety of weights and projectiles is arm length is one third of distance between axles. With the powerbands, longer arms give better leverage for better rotation. The inswinger slingshot machine favors shorter powerbands, longer arms.
The very fastest machine I have built to date is a inswinger slingshot with multiple levers. It worked only for a few shots as the axles were taped and wired on, but it was jaw droping what a little quarter inch hex nut will go through at just six grams. I only recently figured out what happened as the little machine was pulled out of shape resulting in the hyper speed. So plans for a new prototype is there.
I know you guys will want to try and build your own, so please be safe. Aside from powerbands breaking and hitting you in the face, there may be a piece of arm or lever attached to that.
I'll be sending my slingshot to Dennis of the Woodland flipper and see what he thinks about making a few ones up with lightweight high strength stuff.