I have a 43 Black Thunder with labbed 24 Bravo 1's. They had a nice polished finish but slowly the starboard one seems to be eroding. It's on the leading edge of the blade about halfway across. The port prop is still nicely polished. What causes this and do I have to worry about the prop coming appart?

prop burn? passing air bubbles over prop surface.happens over 50 mph?..........m.m..........

Yo're over 50 a lot Mark, is that something that's common?

but i dont have prop burn!!!!!!!!!!!m.m.......

Cavitation burn can be caused by a variety of reasons.

What it actually is though is a pressure differential on the high pressure side of the blade causing the water to boil. The turbulence is violent and burns the metal away.

24 Bravo1's aren't known to have a geometry to induce this. Your situation would be caused by drive height, hull configuration, transducers, etc. causing aerated water to attack the face of the blade.

It is possible to have a casting with extensive porosity which may accelerate the process.

would the boiling create air bubbles?...m.m...

The pressure change cause the boiling which is the bubbles.

thank you............mark...........

If you could post a picture, we could possibly determine whether you are experiencing cavitation burns and not an environmental issue such as oxidation or electrolysis.

Julie

Thanks for the replies. I'll try to post a pic tonight.