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 Post subject: Proper rudder alignment?
PostPosted: Mon Sep 06, 2004 3:08 pm 
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Site Rank - Deck Hand

Joined: Sat Jun 28, 2003 7:03 pm
Posts: 14
Location: Barrie, On
Should both rudders be perpendicular to the back of the boat? I have a Hobie Magnum and I tried to make an adjustment so both rudders were perpendicular to the back of the boat. I had to use maximum extension on the rudder tube and the rudders were still not 100% perpendicular. I went out sailing in 25 knot winds and had good weather helm on one tack and severe lee helm on the other tack. What should properly aligned rudders look like?


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 Post subject:
PostPosted: Tue Sep 07, 2004 5:19 am 
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Joined: Tue Mar 30, 2004 9:32 pm
Posts: 198
Location: West Texas
http://www.hobiecat.com/community/viewtopic.php?t=958

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 Post subject: Which is it?
PostPosted: Tue Sep 07, 2004 9:09 am 
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Joined: Tue May 27, 2003 12:44 pm
Posts: 8966
Location: Oceanside, California
There are possibly a couple of things going on here...

The first is the rudder alignment. "Extended the rudder tube" (tiller cross bar) to its maximum and the rudders are still not in alignment (perpendicular to the back of the boat) ?

The second is rudders that are not locking down correctly: http://www.hobiecat.com/community/viewtopic.php?t=467

In this case, I think the rudders may be mounted on the incorrect hulls (reversed). This can cause serious alignment problems that cannot be corrected with the tiller cross bar. Be sure the upper castings / tiller arms are angled inwards when the rudder is in alignment with the hull. Ultimately the rudders should be in a straight line with the track of the hulls through the water. We call that adjustment toe-in or toe-out. Lock the rudders down. Pull a tape measure across between the leading edges of the two rudders (just below the transom at the little forward hump on the blade). Then measure across between the two trailing edges. The difference between the two measurements? Shorter in the front is toe-in. Longer is toe out. You do not want toe-out. On an 18 it should be square or maybe 1/8" toe-in. Too much difference in the measurements will cause allot of cavitation of the blades as they travel through the water.

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Matt Miller
Director of Parts and Accessory Sales
Hobie Cat USA


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