Jump to content
Steve W

Trailer for Core Sound Mark 3 boats.

Recommended Posts

I mount the bunks on edge and shape them to fit the hull. I prefer that the bunks carry most of the weight, as the center rollers can deform the hull if the keel isn't stiff enough. I think that's the case the way we use a big epoxy "fillet" down the center in place of a wood keelson. Guess I'm kinda paranoid about this, but back-in-the-day when my business was boat repair, I saw a lot of damage from trailers.

Share this post


Link to post
Share on other sites

Dave,

I did not modify the bunks for the Belhaven trailer.  Laid flat the way they are, they deflect pretty well to match the bottom of the boat.  My thinking was to have the good support beneath the 350lb keel and then hold the plywood portion of the boat up with the bunks.

One annoying aspect of bunk set-up is that the bolt holes for height adjustments are in one inch increments.  I got it close but should really go back and put a spacer between the bracket and the bunk to get the forward elevation of the bunk correct.  Lots of "trailer trial and error", really no other way around it.

One last recommendation specific to the Belhaven - Since she needs 10 inches to float and is pretty big to push around you really want to keep the boat as low as possible on the trailer or you won't be able to launch at shallow ramps.  

  

  • Like 1

Share this post


Link to post
Share on other sites

The bunks are just for balancing, so a little flex is actually good.  The 2x4s on my trialer for my 15'-8" Lapwing flex just enough to hug a bit of curve when pressure is exerted.  2x6s seems right for a 20 foot boat.  The spacing of the brackets will effect flex a lot too.  Mine are covered in PVC instead of carpet, easy to slide.

  • Like 1

Share this post


Link to post
Share on other sites

Reading this thread makes me feel guilty about what my CS 20 sits on. About 14 years ago I bought a used 1987 trailer that had an 18' inboard outboard sitting on it for $250. . The 14" tires were new. It is galvanized and looks like it has lived in many places. The boat rests on  7' 4" 2x4 bunks with carpet and some keel rollers. The back of the boat hangs over the back of the bunks by about 3 1/2 ft.  4 years ago I bought new tires and had the bearings packed. I squirt grease into the bearing buddies occasionally. I live in the Denver area. The trailer and boat have been to Lake Superior,  Anacortes, WA (boat to Friday Harbor), the Texas 200 3 times. I  have not had a flat tire or an trailer problem. I should have taken a leaf out of the trailer but I did not so it is a stiff ride for the boat.  Pore thing.

 

So I m probably due some bad luck this year when I drag the boat to Port Isabel for the Texas 200 again. It is about 2500 miles round trip. Gotta buy a cartridge for the grease gun and check the tire pressure.

 

 

Share this post


Link to post
Share on other sites

Extend the bunks to the end just at or just past the transom face. It'll save a "hook" issue later on.

Share this post


Link to post
Share on other sites

I'm running into either trailers that are way to heavy for the boat or light but just a bit short. But I have a 21 foot long Sea Pearl on a Continental trailer that I really like. The boat hangs off in the rear by at least 3 feet. I've found that Continental makes a similar trailer for a john boat. These trailers have some desirable things. Adjustable axle fore and aft. A good flat footprint to mount stuff to. Low profile of fenders.

 

Model JB1812. https://www.continentaltrailers.com/galvanized-bassboat_jonboat.htm

 

It looks perfect, but the boat would hang off the back by almost 1.5 feet. I'm thinking that would be OK. But I want to get a blessing. What do you think?

 

Then I have to figure out how to get it here from Florida. I'm closing in on actually needing it!

 

Steve

 

 

Share this post


Link to post
Share on other sites

It's typical for sailboats to hang off the back to balance the load to give the correct tongue weight, which is 10%-15% of the total load. A benefit of this is that you can often not have to back the wheels all the way in, or you can float the boat off easier without backing off the end of short ramps.

Share this post


Link to post
Share on other sites
5 hours ago, Steve W said:

"It looks perfect, but the boat would hang off the back by almost 1.5 feet. I'm thinking that would be OK. But I want to get a blessing. What do you think?"

 

Steve, my Navigator hangs off the back by about that much and I think it is fine.  10 years of experience with this setup.

 

 

 

  • Like 1

Share this post


Link to post
Share on other sites
11 hours ago, Steve W said:

but the boat would hang off the back by almost 1.5 feet. I'm thinking that would be OK

Mine hangs over the back a lot more- no need to get the tyres wet never mind the trailer or bearings.

Peter HK

tn_P9150058.JPG

  • Like 1

Share this post


Link to post
Share on other sites

If the weight of the boat is well supported by the centerline rollers and the bunks, just keep it from flopping over in over the road maneuvers, the aft overhang will leave no long term ill affects.

Share this post


Link to post
Share on other sites

I ordered it. Now I have to figure out how to get it to NY from Jacksonville when it gets to the dealer in about 2 weeks. Thanks for all the help and thoughts.

Share this post


Link to post
Share on other sites

My trailer for my 15'-8" Lapwing is marketed as a 12-14 foot boat with motor trailer.  It balances at 10% tongue weight and the keel is supported on rollers to about 3.5 feet from transom.  My only regret is not getting a wider wheelbase/lower slung trailer.  With more of you building the Mk3 you should be able to identify a couple good models to work with.

DSCN3709.JPG

  • Like 1

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


 VigLink badge
×

Important Information

By using this site, you agree to our Terms of Use.