Trucks & Trailers - Bunks and Strakes

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View Full Version : Bunks and Strakes


hotdog68
02-02-2012, 03:00 PM
I called the manufacturer of my boat, and they advised me that the bunks on my trailer should not be under the strakes. They went on to say that the strakes are not part of the hull, and that strakes are not designed to carry weight. I've called different trailer manufacturers like Continental and Rocket. Both advised me that; really, the strakes are the only part of the boat that are parallel to the ground; and therefore, the only logical place to put the bunks. One manufacturer explained that they could cut the top of the bunk at whatever angle of deadrise ( in my case 21 degrees), but that the weight of the boat would push outward on the bunks causing the bunk brackets to bend or the bunk to crack over time.

In South Florida, 99% of the trailered boats that I see are sitting on the strakes.

I'm cornfused, what do you guys think?


Garett
02-03-2012, 07:03 PM
Strakes / chimes. Chimes are the part of the hull that is parall with the ground and strakes are the ribs on the underside of the hull to give the hull control in the water.

No I would Not put bunks under the strakes, but I would put bunks under the chimes if I wanted to. I would put bunks in between the stracks and I would put bunks close up to the chimes but not under them.

SCFD rtrd
02-06-2012, 06:30 PM
Try to place the bunks under or very near the stringers.


A Few Dollars
02-07-2012, 06:02 AM
WTF is a chime?

It's STRAKE and CHINE.

The CHINE is the outer edge where the botton meets the hull side.

This hull has 2 strakes and the trailer is set up Wrong.

Bunks should be just outside the strakes

http://www.thehulltruth.com/attachments/boating-forum/154652d1297223030-2004-pro-line-bunk-vs-strake-location-front_r_hull.jpg

mwgoldman
02-07-2012, 10:22 AM
I disagree, the bunks for a fiberglass boat should be under the strakes (like you said it is the only parallel structure under the boat).

In a wood construction the strake is not integral so I would not support the boat on a strake that was not integrated with the structure of the boat (please don't nit pick the details on this). Traditional ship building required the hull to be formed first and the strakes to be added (usually with mahogany) then glassed over. but in new fiberglass molded boat construction the bunks should be under the strakes for the reasons that you posted above.

Support it under the strakes. Now if your boat company is telling you not to I would do what they say, but I would ask them why.

Fcal
02-07-2012, 10:22 AM
Maybe he has a bunk under a set of wind chimes.....

Thalasso
02-07-2012, 10:40 AM
WTF is a chime?

It's STRAKE and CHINE.

The CHINE is the outer edge where the botton meets the hull side.

This hull has 2 strakes and the trailer is set up Wrong.

Bunks should be just outside the strakes

http://www.thehulltruth.com/attachments/boating-forum/154652d1297223030-2004-pro-line-bunk-vs-strake-location-front_r_hull.jpg

You are correct to a point.( Trailer bunks are set up wrong ) I think the bunk that is verticle should be tapered to the angle of the hull and be on the inside of the strake which will help in centering the boat when retrieving. The bottom bunk should also be inside the strake at an angle that reflects hull . (edit) Looking again at the picture, the bunk looks to be tapered. It is designed to be inside of the strake. The boards should just touch the strakes

Kevin Desselle
02-07-2012, 10:50 AM
Bunks should be placed just inside or just outside the strakes to help guide the boat in place.
Outside the strake.
http://i128.photobucket.com/albums/p180/sporttrail/005-22.jpg
Inside the strake.
http://i128.photobucket.com/albums/p180/sporttrail/006-11.jpg

This pic shows a common problem when bunks are set directly under strakes. If the boat is not loaded perfect, it can easily fall off the strake causing the boat to load crooked as seen in this pic.
http://i128.photobucket.com/albums/p180/sporttrail/non%20trailer%20pics/014.jpg

gf
02-07-2012, 11:22 AM
Kevin Desselle, nice job with that post.

Not sure where that Regulator 23 picture came from but that looks like a sweet set-up and the trailer looks good too.

On my boat, the bunk sits inside the strake.

http://i248.photobucket.com/albums/gg164/gf2020_photos/Trophy/digi35613247_l.jpg

A Few Dollars
02-08-2012, 06:01 AM
Bunks should be placed just inside or just outside the strakes to help guide the boat in place.

This pic shows a common problem when bunks are set directly under strakes. If the boat is not loaded perfect, it can easily fall off the strake causing the boat to load crooked as seen in this pic.
:thumbsup: Kevin knows.

hotdog68
02-10-2012, 12:05 PM
Thanks for the helpful information. You would think that the strakes are strong enough because alot of the bunks are made curved on one corner and flat on top. You would think that the curved part fits perfectly on the underside of the the strake where it meets the hull and the flat part falls neatly under the strake. I have adjusted the bunks inward so that the curved part of the bunks hold the boat. I have adjusted it so that a credit card fits between the flat part of the bunk and the underside of the strake. I am considering adding two more bunks closer into the middle in order to distribute the weight; however, I don't know how this is going to affect the loading process of the boat. I usually power load the boat because, otherwise, I can't get the boat to center perfectly on the trailer. Has anyone ever added two center bunks under the transom?



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