What I Made:
I made a PVC bow. The bow itself does not flex much, but instead the bow gets its power from bungee cords at each end of the string. It works like a normal bow, except for the bungee cords are really loud. I remedied this by wrapping electrical tape around the hooks, but there is definitely a better solution, as this prevents the bow from being unstrung. I used a Coleman (no relation ;) ) propane stove, a piece of PVC I found in a shed, paracord from Wal-mart, and two bungee cords. I also needed some arrows, which I borrowed from my brother who has a legit compound bow.
How I Made It:
I got the idea for this bow from several other Instructables. I have been looking for a use for the random pieces of PVC lying around our property, and this was a simple, good use, as I have been searching for a decent bow at a decent price. This one is free and almost as good as a normal wooden bow.
First, I acquired a piece of PVC. It was about four feet long at the start. With a small propane camping stove, I heated the PVC where I wanted to bend it. During this step I worked OUTSIDE - carbon monoxide from the stove will KILL indoors. When it was heated enough, I bent the PVC against the ground, forming the shape of the bow. I tried to make sure that everything was perfectly symmetrical, but just smashing a piece of PVC into pavement usually doesn't do the job. :) After I had the right shape, I went inside and started messing with my two bungee cords and my paracord from Wal-mart. In the end, I simply tied a taut-line hitch on the top end of the bow and a bowline on the bottom. (See pics for help.) The knots go around the bungee cords to complete the bow string.
EDIT - The taut-line hitch went all the way to the bungee cord. I couldn't get it to stay normally.
ANOTHER NOTE: DO NOT BURN THE PVC. IT RELEASES BAD THINGS THAT WILL HURT YOU. DO NOT USE THE STOVE INDOORS - FOR ANY REASON, EVER. IT'S A CAMPING STOVE FOR A REASON.
Where I Made It:
I made this bow on a piece of my driveway (PVC forming) and in my basement (making the string). As it was spring break, I had plenty of time to tweak and adjust the design. Well, before I left on exchange to Japan. This bow was a good stress reliever before I left, just going out in my backyard and shooting.
What I Learned:
I finally learned how to shoot off-hand! I've been wanting to try it for a long time, and this bow was a perfect opportunity to do so, as the (nonexistent) grip is ambidextrous. I also completed my first PVC-forming project. The string was kind of difficult. I originally tied two taut-line hitches, but they kept slipping. In a last-ditch effort to save all my work, I tied a bowline on one end, letting the other taught-line slip to the end. It worked! In hindsight, it would have made much more sense to tie the knots on the ground (see pictures) so that the hooks of one bungee cord were a few inches shorter than the bow. But I didn't. :) Another lesson learned: plan ahead!
SAFETY: DO NOT POINT AT PEOPLE OR ANYTHING ELSE YOU DON'T WANT TO HURT. I am not responsible for damages done by or with this project. This can be fun if the proper steps are taken!