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Rudder adjustment http://www.hobie.com/au/en/forums/viewtopic.php?f=45&t=51523 |
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Author: | ToddE [ Thu Jun 05, 2014 11:49 am ] |
Post subject: | Rudder adjustment |
Howdy all, I have the 21SE all spruced up and rocking on the water. New whirlwind sails arrive tomorrow, I'm sooooo excited! On to my problem. I have 2 H16's and I have their rudders adjusted perfectly so I'm familiar with the system but I'm having issues with the 21. I have completely rebuilt the rudders, new cams, new screws, new plunger and springs, no old parts at all. The castings are in really good shape. I have lubed the plunger and adjusted the rudders so they lock smoothly, shims are installed so all is tight and smooth. The issue is that after they lock, I can pull the rudder tips a fair bit up/aft. This is giving me too much weather helm. On the 16s when the rudder locks, it does not have any movement aft at all. What am I missing? Did Hobie send me the wrong cams? Do I need to move the lock bars further forward? Hellllllp! -Todd |
Author: | mmiller [ Thu Jun 05, 2014 11:57 am ] |
Post subject: | Re: Rudder adjustment |
You actually may have the adjuster plates too far forward. This keeps the cams from fully locking. Back off the plates... hold the rudder forward and slide the plates forward (while allowing the upper casting to move vertically) to just touch the cam's hook with light load. These adjustments are in the cam FAQ: http://www.hobiecat.com/forums/viewtopic.php?f=18&t=467 Quote: A cam plate too far forward can keep the cam from fully locking. A cam plate too far aft will allow the rudder to slip aft in the lower casting or allow the upper casting to be raised without pulling the cam open. To adjust the upper plate, lock the rudder down and hold the rudder firmly against the lower casting (forward most position). Loosen the upper plate then back it away from the cam a little. You want to seat the plate tight against the cam (in the fully locked position) while holding the rudder forward in the lower casting. Ease the plate forward while wiggling the upper arm up and down just a bit. The idea is to find the point of deepest insert that the upper plate can get into the cam. That may mean that the upper casting is not touching the lower casting. Don't force the plate too far forward as this will begin to force the cam open. When tightening the plate, be sure the plate doesn't move. I usually tighten with the wrench handle rotating forward towards the cam to move the plate forward if anything.
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Author: | ToddE [ Thu Jun 05, 2014 11:58 am ] |
Post subject: | Re: Rudder adjustment |
Thanks Matt! I'll try tonight. Can you delete my double post? |
Author: | ToddE [ Thu Jun 05, 2014 12:02 pm ] |
Post subject: | Re: Rudder adjustment |
Oh, and while you are in 21 mode, what is the best way to align rudders? It looks to me like the hulls are canted and the H16 method wouldn't work. I have done them by eyeball, but I would like to check. |
Author: | mmiller [ Thu Jun 05, 2014 12:44 pm ] |
Post subject: | Re: Rudder adjustment |
Same FAQ... Quote: RUDDER ALIGNMENT - Check rudder alignment in the direction of travel. Proper rudder alignment would be 1/8" to 1/4" toe-in on a 14 or 16. This is measured with the rudders down. Measure leading edge to leading edge and then trailing edge to trailing edge. The front (toe) should be closer together than the trailing edge. Measure at about the little hump on the leading edge and straight back from there for the trailing edge. It is always possible that the rudders are actually mounted on the reverse hulls. That causes extreme toe-in problems. Look at the upper casting / arms to be sure they angle in towards the boat's centerline when the rudders are in alignment with the hulls. Same on the 21... Parallel to toe in. |
Author: | ToddE [ Thu Jun 05, 2014 12:48 pm ] |
Post subject: | Re: Rudder adjustment |
Thanks Matt, I read that, but was not sure it applied to the 21. -Todd |
Author: | ToddE [ Mon Jun 09, 2014 10:07 am ] |
Post subject: | Re: Rudder adjustment |
Well, I'm stumped. I played with both rudders this weekend. I can't see what is allowing the rudder to move aft after it is locked. I adjusted the plate as Matt suggested, basically as far aft as it will engage the cam. This works well enough but does not remove the aft play (more than an inch) I tried from just enough to tip the cam, to all the way forward. The rudder locks and releases fine, but no matter what I do, after it locks I can pull the rudder aft a fair bit before the cam stops it, pull more and the rudder cam pops like it should. I do get a good shoulder workout while sailing... Also, my hulls (and rudders) slant inward at the top. My rudders are almost two inches closer at the castings than at the tips when down. The boat seems very solid. Would this indicate that I have a problem at the crossbars?? -Todd |
Author: | ToddE [ Mon Jun 23, 2014 1:48 pm ] |
Post subject: | Re: Rudder adjustment |
After much experimentation and frustration, I'm happy to say that my rudders now work perfectly. I can't see what parts have worn, but I had to move the adjuster plate farther forward than the bolt allowed. I drilled and tapped a new hole just behind the existing hole and viola! Soooo much better without all the weather helm. -Todd |
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