well my bungee ramp is ready for testing some time this week.
did a few mods after i made it. have lowered the rails a little and sanded the end elbows flat and put some tape on to help the plane slide over it.
on testing i noticed upto 15lbs of pull on the bungee the PVC pipe was bowing some,so have found a perfect steel sleeve to go inside and will not bend now.
the pin will fail first.
should be able to handle 30 lbs of pull and more.
takes about 20 seconds to put together and dismantle.