98Fever27

So I am getting some cavatation burn on both sides of my outdrive. It is rite behind my water pick up. I was told that it is from air bubble actually burning and eating at the drive. So i took a piece of sand paper and sanded it just in case there was some burs or something. What else could really cause this.?

firehawkcat

the cavatation cant be good on the drive, what kind of prop

98Fever27

I am running a 26p mirage. It was lab finished and now it need to be redone. I know it cant be good for it.

firehawkcat

My cat was real bad with cavatation until i put a bravo 1 prop on

firehawkcat

I have heard of the air bubble burn before thought it was bull until you posted

CigDaze

Cavitation burn is no joke. Over time, it can eat right through and does wonders for streamlining waterflow.
It occurrs in areas of extreme low pressure, usually behind some kind of protrusion - like water intakes, or just behind leading edges or drives and props. This low pressure actually "boils" the water turning to steam very briefly. When it returns to its liquid state the implosion of the bubbles erodes the metal because they're actually mini sonic booms.

Check out this photo. The "air" you see is not really air sucked from the surface, rather it's water turned to steam right behind the leading edges of the prop where the lowest pressures are seen.

thirdchildhood

iTrader: (6)

It's eating my Imco w/Bravo 1. Word on the Donzi forums is that there is not a thing I can do about it.

Griswald

I have the same burns just like you described

98Fever27

So how do you take care of cavatation burn?

thirdchildhood

iTrader: (6)

Mine is getting worse. I wonder how thick the aluminum is there. Pic is in post #7, now it is twice as deep .