hello all and thanks for the help in advance

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ok i have a evolution trainer engine i just bought and i am wondering 2 things about this engine=
#1 what is the actual size of this engine ? the displacement says its .455 cu in is that about the same as a .46 size engine ?
and now the 2nd part, what prop have people been using with this engine other than the 3 blade ?
btw this engine will be going on a slowpoke sport arf i think. still undecided or if its same size as a .46 it may go in my machi veltro 205 warbird if you all think it has enough power ?
again thanks for the help
bassman
p.s. one last question = when you switch to a larger diam prop does it help you to slow down for landings ?