Hi Guy's
We made up a bungee setup and have been launching fjs and miglets all summer without any mishaps.
blkz, as far as locating a hook on a fj, heres the formula.. measure from the nose to the c of g, take that measurement and go back 2/3 from the nose thats where your hook should be. I used a piece of 1/8 ply hot glued in and havent had a failure. 3m also makes plastic hook's with a glue strip on the back { i think they are meant for picture hangers} but dont use the glue strip just hot glue it to the bottom
We don't use any kind of launch stand , but we did make a foot trigger. just stretch the bungee, hook to the plane and the foot pedal and launch it right off the ground. Just don't forget to make sure that your throttle lock is off, i made that mistake once and was only a couple of feet off the grass before I got the power on....oops...lol.
My fj wiegh's in at 30 ozs and i'm using 12.5 lbs of tension on the bungee.
Give it a try it's a blast and much safer for you and your plane
Risky