I have been a slope pilot during the 5 years I have been into RC. I have recently decided to try thermal soaring and participate in the acievement program of the LSF. I am building a Guppy sailplane and a DLG to start thermalling off some sand dunes at my beach house and need help with upstarts... I plan on making my own. I need some help on materials, size of bungee cord, size of cord, attatchment methods and releases.... I also want to know how to position the tow hook on my glider.