I need some help with picking the right prop for two new airplanes.

1st is a U_CAN_DO_3_d with a super tigre .90. I know I won't have a lot of extra power so I was thinking a 15*4 APC.

The 2nd plane is a Magic 300L by modeltec with a HP .60 on it. I have the 1st magic with a webra .40 running a 12.25*3.75 and am very happy with it. I have no Idea how to prop this .60 for funfly.

I want to hover both of the planes, Thanks for any help or suggestions you might have.

Brandon