how about an M-80 and a sling shot?
how about a harpoon
how about a bow attached to a reel
how about a deapth charge?
Would I buy a fishing gun rod? no, some one just came out with one for the kids last year, it kinda reminded me of the pocket fisherman and I thought that was junk, but kids like anything that is self propelled.
with out a doubt kids would like what ever you came up with if you can do it without infrindging on some one elses patten.
other than kids, you would need to find a market then build one to accomidate the market. "make sence?"
meaning if you had a multiple amputee with one working arm in a wheel chair you may be able to come up with a product he could use.
- here today gone tomarow fad products are built then a market is attempted to be located for it. makes a pocket full of change if lucky then gone
- products bult to fit and existing market become stable and provide long term jobs and proffits. There are markets for products not yet invented.
so yes if you build it for the right market you might have something. other wise you may just have another peice of junk that will waist environmental resorces for quick pocket change.