I've got a new Magnum XL-108A and am going to be using a 13x6 APC for break in. I was wondering what would be a good prop to go with after break in?

well 13x6 is too small for a 108. I use a 13x6 on my OS MAX 61 SF ABC long stroke with a TT standard mufler baffle removed which revs it up to 11,100 rpm.So I think 13x6 will underload this engine.what does the instruction manual says.I suggest atleast a 15x7-8 shoould be used.

According to the instructions 13x6 break in prop, then for normal use 13x7, 14x6

The Magnum 1.08 doesn't swing big lumber, nor does it turn many revs.

Dave.

Then use a 13x6 perhaps they have designed the port timing that way but honestly it is for sure a small prop for 1.20 cu in engine.[8D]

Thanks for the info guys....

I run a 14x10 on my ASP 108 (older one). A 15x8 also works well. Higher pitch flies my GB Ultimate Bipe fairly fast, with decent vertical. Also cuts the noise somewhat. A 13" prop on a 108 sounds small to me.

Clair