the props in the box are from Dag Camman-Walzcak, handmade and not to sell.
contact "erdt" from RC-Network, he sell ICcarbon props in 8x10 , 8x11, 8x12, 8x13.
7x11 for eletric and 10x20 folding prop
http://www.rc-network.de/forum/member.php/30648-erdt
but no one in F3S fly 8,7" props, most 8" is the maximum.
I fly 7,8 x 12 on my OPS90