I have 15 x 7 and 13 x 8 3b props on my shelf. Not a prop hoarder like some around here are! LOL Where they came from? not sure, but I think one of them was off my FA-100 GK when I bought it at a swap. I will need to match the hub up to it to know, if I can find it. Now to go and find me some 3010 Futaba servos, running low.