More growth on rudder than hull

[Neil]

When I bought the boat there was a forrest growing on the ruder. It was cleaned off before delivery, but rapidly returned. When I hauled out during the summer, the hull was relatively clean, though the rudder was very weedy. I cleaned off and re-antifouled, paying much attention to the rudder, giving it an extra coat of antifoul. However, in the words of Arnie, 'It's back'. Why should the rudder be more prone to growth? What other steps might be taken?

 

[William_H]

If it is a transom mounted rudder then obviously more sun gets to the rudder. Also the rudder might get more turbulence so a softer antifoul might get eroded more.
What steeps can be taken? Well frequent cleaning by hand is my answer. I find after 6 weeks from new paint it needs a wipe down and after a few months it really needs it weekly. (warm water lots of sun) So sorry no answer at all for you. good luck enjoy the craik olewill

 

[Eyore]

As mentioned its the sunlight. It always grows around the waterline and rudder, an extra coat on a rudder and the top 6/8" up to the waterline is always a good idea.

 

[vyv_cox]

My rudder is always more fouled than the hull, even though it is not transom hung. There is a flat on the top of it, beneath the hull, that is particularly attractive to barnacles. Despite applying loads of antifouling there is always a healthy crop of them there at the end of the season, but nowhere else.