i never made one, but use a lot of fiberglass and kevlar!!

I have one Kevlar tank in my harpoon, and last time when dismanteling the model after the flight, i noticed jet-a1 coming out from the weels cut..

checking everything i found out the tank was leaking! [X(]

i putted the tank in water, some air pressure and i had 5 leaking point!!!![:@]
and all in point where there is no contact with the airframe at all!![:'(]
The tank was made in germany...

the tank as no more than a layer of kevlar...so if i will buy or made one alone...3-5 layer of kevlar and fiberglass!!