Prop Size for 1/12 Miss Llumar

[boem]

Could anyone be so kind to tell me if these prop will fit on my 1/12 Miss Llumar. I have already change the .15 dynamite to .18 O.S. and I like to know if I would change the prop from the below prop which one would you choose and why? Most importantly will it fit without having to make any modification to the boat?

1.Octura Y547
2.Octura Y557
3.Prather 215
4.Prather 220

Thank you very much

[Kirker]

If you go to TowerHobbies or some of the other outfits that sell props they have a chart that can help you pick. I am in no way a expert but at least as far as the Prather ones, they seem a bit small. Others on here know much more than me though.

[BoatDoc]

IMHO...those are all too big. the motor will never get up to RPM, especially the 57mm! the y535 was a good prop for the miss bud, and might not be a bad place to start for the lumar. i know the drives are slightly different, and the new hull might allow for a bigger prop. however, going over 40mm may not work. haven't run one of those boats, so i can't be sure, but i've always been in the "start small and work up" school of thought.

[boem]

Thank you very much for all the help. I'm currently using Octura Y535 but it did not make much difference with the plastic one so I like to know which one would make my boat faster. Any suggestions?