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 Post subject: Rudder Thunk
PostPosted: Mon Sep 09, 2013 10:09 am 
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Site Rank - Deck Hand

Joined: Wed Mar 27, 2013 11:59 am
Posts: 1
I seem to have a rudder problem on my 83 Hobie 16. Or at least I think it's a rudder problem. Whenever I get moving along pretty well and am up on one hull I hear (and feel) a "THUNK", and then the stern of the hull drops down a few inches deeper into the water and it feels like a lot of drag is created - I lose speed.
I've used the rudder stiffening discs to try to eliminate some play. It didn't make a difference.
I am at a total loss as to what is creating this problem.
Any ideas?


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 Post subject: Re: Rudder Thunk
PostPosted: Mon Sep 09, 2013 11:07 am 
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Site Rank - Old Salt

Joined: Sun Sep 20, 2009 4:00 pm
Posts: 340
Location: Charlottesville, VA
It sounds like a rudder is kicking up, but you would notice that. Do you know exactly how the rudder lock-down works, and how much tension is required to kick one up? Your '83 predates the good rudder system.

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 Post subject: Re: Rudder Thunk
PostPosted: Mon Sep 09, 2013 11:33 am 
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Joined: Tue May 27, 2003 12:44 pm
Posts: 9145
Location: Oceanside, California
I'd be looking at structural issues in the boat. Loud thunk? Rear drops down? That is odd.

A tight rig (shrouds tight) should keep the hulls and tramp frame snug. Lateral play in a hull to pylon connections could cause a thunk as the hull shifts. Loose gudgeon screws could allow a rudder to shift and thunk.

Aside from the alignment of the rudders... I would be looking for pylon issues, gudgeon issues.

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