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yes, i meant the .65 LA.
I want to fly it and get it do all it can, plus more, mainly (if I can) Hover
What size prop should I use?
Im building it as it says to, so an average weight.
I plan on using 15% on it
First, the 4* is not DESIGNED to hover. I am not saying it won't, just that it is not designed to.
Next, IMHO, the 65 LA is not going to have the power to pull the plane out of a hover. You should be able to hover at 3/4 throttle or less so you have the reserve power to pull out of it.
As for a prop you will need to experiment. A good starting point (provided the LA will handle it) would be something in the 12x4 - 13x4 range.
If you want to TRY to hover this plane and/or perform "authoritative" aerobatics, you really should have a ball bearing 61 - 75 2 stroke or an 80 - 91 4 stroke.
Hope this helps.