Prop Zinc

[Seacurves]

Speaking of prop zinc deterioration... How long does the zinc typically last before it needs to be replaced?

[niftynickers]

Zinc usage has many variables.Whether your boat is plugged in to shore power,whether your neighbor is plugged in with current leakage even the salinity of the water you are in will affect the zinc.
The correct zinc for the C37 with a 1"shaft is a "C" zinc. Locktite (red) does help to retain the screw or you can install the screw from the inside of the acorn nut and hold the zinc on with a nylock nut.This method works fine if you haul each year and dont have to change zincs in the water.
Good luck.
Dianne and Chuck Burke S/V NiftyNickers C37 #139

[Fstbttms]

Originally Posted by Seacurves

Speaking of prop zinc deterioration... How long does the zinc typically last before it needs to be replaced?

If you're in freshwater, you shouldn't be using a zinc anode at all. You should using a magnesium one.

[Seacurves]

Really?? Magnesium? Why the difference?

[Fstbttms]

Originally Posted by Seacurves

Really?? Magnesium? Why the difference?

Zinc anodes do not have the electrical potential to overcome the greater resistance of freshwater. Magnesium anodes are designed especially for this purpose.