I bought a Hobie 16 this year and have had it on the water a couple times. I have found that when I get up to speed, I have a vibration coming from the rudder. What do I need to adjust?

A comment from one of the videos I posted:

rattlenhum

FAQ on rudder hum/whale noise: https://www.hobie.com/sup…om/support/tech/hum.html

Here is my rudder noise video:
https://youtu.be/GOX88EIhWDw

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Bryan in Poplar Grove, IL
Supercat 17, unknown year. Future project
Hobie 16, 1977 - died a spectacular death https://youtu.be/Y7O22bp2MVA
Hobie 16, 1978 - current boat
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It's the fat lady singing!

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Jerome Vaughan
Hobie 16
Clinton, Mississippi
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Correct me if I'm wrong but I heard it could be caused by your rudders being perfectly aligned which isn't a bad thing. If it annoys you try toeing them in a tiny bit.

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Bill Townsend
G-Cat 5.0
Sarasota
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What type of rudder blades do you have (Lexan, fiberglass, EPO, etc.)? The classic explaination for Hobie rudder hum is turbulence coming off of the trailing edge. The fix is to clean up the trailing edge of the blade.

https://www.hobie.com/for…ewtopic.php?f=18&t=12859

sm



Edited by Dogboy on Aug 20, 2021 - 09:59 AM.

I have the EPO rudders on my H18. They hum quite a bit at speed.
I followed the Hobie “fix”, didn’t do anything, they still hum.
It’s now something I ignore.

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Hobie 18 Magnum
Dart 15
Mystere 6.0XL Sold Was a handful solo
Nacra 5.7
Nacra 5.0
Bombardier Invitation (Now officially DEAD)
Various other Dock cluttering WaterCrap
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We've had success by slightly beveling one side of the trailing edge and giving it an asymmetrical profile. It also helped some with the N20 1st gen. rudder ventilation issues.

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Philip
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I like it.

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1978 H18
1983 H18 (some of it)
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