Bunk Settings/Adjustments

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Bunk Settings/Adjustments

Postby Zinger88 » Sun Oct 16, 2016 10:15 pm

Ok..so I spent the weekend replacing my 2x4 on edge side bunks with 2x8's flat and also replaced the keel rollers with a 2x8 bunk (pictures to come later). For those who've replaced their keel rollers with bunks, can any of you tell me what the typical height difference is between the keel bunk and side bunks for a DSII?
Jim H
'76 Daysailer II, Sail #7920, Windsong
Burton, TX
~~ _/) ~
Zinger88
 
Posts: 34
Joined: Fri Sep 23, 2016 2:27 pm
Location: Burton, Texas

Re: Bunk Settings/Adjustments

Postby Zinger88 » Thu Oct 27, 2016 1:15 pm

Here's the before/after photos of my repairs and upgrades to ol "Rusty" (yes…I even named my trailer :wink: ).

First I dry launched the boat onto the hard utilizing a few discard tires that I picked up for free from Discount Tires. Using Rusty's tilt feature, the boat slid easily off the trailer onto the tires and was perfectly balanced with one tire being placed at the aft end of the CB trunk and the other at the forward end. I then placed two additional tires on either side of the boat basically for peace of mind even though they weren't actually needed.

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Jim H
'76 Daysailer II, Sail #7920, Windsong
Burton, TX
~~ _/) ~
Zinger88
 
Posts: 34
Joined: Fri Sep 23, 2016 2:27 pm
Location: Burton, Texas

Re: Bunk Settings/Adjustments

Postby Zinger88 » Thu Oct 27, 2016 1:19 pm

Here's what Rusty looked like once the boat was off.

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Jim H
'76 Daysailer II, Sail #7920, Windsong
Burton, TX
~~ _/) ~
Zinger88
 
Posts: 34
Joined: Fri Sep 23, 2016 2:27 pm
Location: Burton, Texas

Re: Bunk Settings/Adjustments

Postby Zinger88 » Thu Oct 27, 2016 1:23 pm

After doing a lot of reading/research on this forum, I decided to replace the side-bunks with 2x8x6' flats and also the keel rollers with a 2x8x10' bunk. The bracket hardware and bunk carpet was picked up at Academy and the bunk material is pressure treated lumber from Home Depot.

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Jim H
'76 Daysailer II, Sail #7920, Windsong
Burton, TX
~~ _/) ~
Zinger88
 
Posts: 34
Joined: Fri Sep 23, 2016 2:27 pm
Location: Burton, Texas

Re: Bunk Settings/Adjustments

Postby Zinger88 » Thu Oct 27, 2016 1:25 pm

I had some scrap galvanized plates which I cut to size and used under the bunks to provide more of a platform for the bunks to sit on.

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Last edited by Zinger88 on Thu Nov 03, 2016 4:20 pm, edited 1 time in total.
Jim H
'76 Daysailer II, Sail #7920, Windsong
Burton, TX
~~ _/) ~
Zinger88
 
Posts: 34
Joined: Fri Sep 23, 2016 2:27 pm
Location: Burton, Texas

Re: Bunk Settings/Adjustments

Postby Zinger88 » Thu Oct 27, 2016 1:30 pm

As noted in a previous post, I had a real issue with the hull on the starboard side "oil canning" from sitting on a 2x4 on edge bunk.

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When I pulled the boat back up on the trailer from the hard it was amazing to see that there was almost a 1" gap between the bottom of the hull and the new bunk on the starboard side with the boat sitting level on the trailer (both side bunks were at equal height).

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Last edited by Zinger88 on Thu Oct 27, 2016 4:27 pm, edited 1 time in total.
Jim H
'76 Daysailer II, Sail #7920, Windsong
Burton, TX
~~ _/) ~
Zinger88
 
Posts: 34
Joined: Fri Sep 23, 2016 2:27 pm
Location: Burton, Texas

Re: Bunk Settings/Adjustments

Postby Zinger88 » Thu Oct 27, 2016 1:39 pm

I'm going with the theory of allowing most of the weight to ride center-line on the keel bunk and the side-bunks are utilized mainly for lateral support when traveling. I let the boat sit on the trailer as shown in the above photos for almost a week before I had her out in the water and "presto!"...no more oil canning. The hull settled back into place and she now sits nicely with equal support distributed between the side-bunks. This was similar to what klb67 said had happened to him in another post.

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These new bunk upgrades have made a HUGE difference in 1) how the boat sits on the trailer and 2) the ease of launching and retrieving from the water. Well worth the weekend spent working on it! :D
Jim H
'76 Daysailer II, Sail #7920, Windsong
Burton, TX
~~ _/) ~
Zinger88
 
Posts: 34
Joined: Fri Sep 23, 2016 2:27 pm
Location: Burton, Texas

Re: Bunk Settings/Adjustments

Postby GreenLake » Thu Oct 27, 2016 5:44 pm

Cool! Nice pix.
~ green ~ lake ~ ~
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Re: Bunk Settings/Adjustments

Postby chocolatehauler » Fri Nov 04, 2016 10:27 pm

Nice i'm redoing bunks on my trailer also. I like what you did. Hoping you don't have a patent on it. :)
Schwill Yachts DS-16
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Location: Tip of the mitt Michigan

Re: Bunk Settings/Adjustments

Postby Shagbark » Sat Nov 05, 2016 12:49 pm

It seems without rollers the boat would have a tendency to move off-center when trying to put the boat on the trailer. The bow hitting that initial roller helps line everything up. How has your experience been without the roller? How do you make sure the boat stays on-center?
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Re: Bunk Settings/Adjustments

Postby Zinger88 » Mon Nov 07, 2016 9:52 am

I mainly beach launch at the lake since we have an area close to the house where I can pull up to the water with the trailer. I utilize the tilt feature when retrieving and have found the trick for us at least is first placing the bow on the back of the keel bunk to line things up and then my wife stands along the side of the boat (she's only in knee deep water) to help guide it as I winch it up onto the trailer. I watch the front of the bow as it's sliding along the keel bunk and can pretty well sense if things are getting off line and I'll also stop periodically to check alignment. That technique has worked for us thus far, although I am debating about adding some guide-ons to the trailer but haven't made a final decision on that yet.
Jim H
'76 Daysailer II, Sail #7920, Windsong
Burton, TX
~~ _/) ~
Zinger88
 
Posts: 34
Joined: Fri Sep 23, 2016 2:27 pm
Location: Burton, Texas

Re: Bunk Settings/Adjustments

Postby GreenLake » Mon Nov 07, 2016 11:24 pm

My contention is that bunks are actually easier than rollers, because the hull can slide along them on any direction, meaning that the bow, for example, always moves towards the winch. With rollers, if the boat is askew, you may get the effect that the boat may maintain that angle.

I use a notched rear roller to capture the bow (with the sharp keel at that point). I then winch the boat to close to where the bow would meet the next roller. At that point, the boat "pivots" on the one roller and I can align it (without getting into the water). Shortly after the bow passes the second roller, the bunks will support the weight of the rear (since I've set my rear-roller a bit low). At that point, the back of the boat will slide in the direction of the pull, so all I need to make sure is that the bow continues to stay in line for the front rollers (if I had a keel bunk for the forward end, that would, of course work just as well, because at that point the boat is lined up and would follow the direction of pull).

I do not use the tilt feature for retrieval, but need to drive the trailer in a few feet more than for launch (where I do use that).

The only time I need to stabilize the boat more than what that first roller can do, is when there is strong wind/current/wave action. For wind and current I use a long stern line from shore, waves are a different issue, because they can lift a fully aligned boat off the bunks and bodily shift it. Those conditions have been among the very few times that I've had anybody in the water.
~ green ~ lake ~ ~
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