Biofoam catapult 8inch glider

[B.karthik]

hi friends i have made a 8inch wingspan biofoam(4mm)catapult launch glider.
materials:
1.biofoam of 4mm thick
2.bamboo for fuselage
3.balsawood for fin
problem:
1.foam of wing bends when launched with full stretch by catapult
solution:
1.given a reinforcement in the wing with 0.2cm thick woodstick used for home-cleaning.

question:
1.shall i need to give reinforcement for tailplane?
2.what are the materials can be used for reinforcement?
3.how should i groove in wing for placing the stick for reinforcement accurately?
thanks
karthik

[Brianathayes]

Make a shallow groove in the foam, using a VERY sharp knife (no more than 1.5 to 2 mm deep. Press a length of thin carbon rod into the groove, then flow foam-safe cyano into the groove to fix the rod. You can use foam-safe accelerator to set the ca if you like, or you can just let it set on its own.
Another method might be to use thin string instead of carbon - the CA makes the string harden like wire, but I think the carbon rod is best.
Don't recommend the 'woodstick', too brittle, it will break under load.

You shouldn't need reinforcement for the tailplane, it doesn't carry the same stresses as the wing.

Brian