Prop Question

[tsubaki]

Depending on the grade of stainless, there will be rust and magnetism.
Stainless, dosen't mean "it won't rust", it just stains less.
The higher the carbon content the stronger the metal, the more magnetic but the quicker it will rust or stain.
Almost pure stainless is too soft for most applications.

[spareparts]

that thing needs to turn close to 6000 rpm at WOT, see what it will turn with the 19 at WOT, then change props accordingly

[Jetty Rocker]

The Yamaha Tech line told me that the one like you are describing are called "Black Steel" which have "SOME"" stainless in them. They paint the prop to keep them from rusting, but we all know what happens when the paint wears off. Yamaha polished stainless props cost the same so I don't know why the dealer chose the Black Steel. Also the F-150 (4 stroke) has a v-6 gearcase so yes the prop from the 200 will work. Your friend might want to look for the biggest diameter that he can get to help prevent blow outs.

[garagenc]

when it comes to stainless, unless you get into the 500 grade (anything less such as 300 ss) then a magnet will stick to it. Most items that are identified as stainless steel is only about 300 grade.

I have the chemicals to do a acid spot test and I can compare it to different test strips to determine what grade stainless it is.