help with prop size

[ando]

hey all ,have just finished my 32 cat set up,i am running a 8xl with a x440,2 x 4s packs in parallel 2200 mah. and a hextronic 120 esc ,also added water cooling for both the esc and 8xl.
took it for a run and all went well ,seams to be fast .what i am wondering is what sort of prop size range i can use with my set up ?
here are a couple of pics.
cheers ando.

[DISAR]

If everything was cool with the x440 then you can also try the following which will give higher speed within a reasonable level of risk:

m440, x640, x440/3, grimracer 42x55, graupner 2317.42, prather 215, SuperVee stock 3blade prop.

And the following will give you more speed with more risk; but I am bit concerned about your batteries, if they will handle the higher amps, otherwise they will be destroyed.(Happened to me with cheap e-bay batteries):

m545, m645, 2317.45, prather 220

There are many choices and of course you cannot try them all. The best thing is to get an advice form someone with the same boat and setup. I have same boat which used to run on the stock motor, 3s2p. But now I will fit a 9Xl motor, 4s1p.

[ReddyWatts]

I would try the M440 next.