Trucks & Trailers - How Should Boat Sit On Bunks?

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View Full Version : How Should Boat Sit On Bunks?


splitshot-bk
03-15-2011, 09:04 AM
I have a 7,000 Continental aluminum trailer for a Contender 23 Open. The aluminum cross-member with the v-guide cracked and I'm replacing it with forward bunks instead.

While replacing the forward cross-member and guide bunks I need to determine how much weight to put on the new forward cross-member and guide bunks.

Continental said no-weight or very little. A trailer shop in Florida who seems more knowledgeable and sold me the OEM parts said the forward bunks should take a few hundred pounds and that there should be a gap at the forward section of the MAIN BUNKS..........i.e. by putting weight on the new forward guide bunks it will lift the hull off of the very forward portion of the MAIN BUNKS. The said it shouldn't sit flush the entire length of the main bunk.

I need THT to break the tie.................GAP or NO GAP.


JALICHTY
03-15-2011, 10:09 AM
On the Sea Hunt Escape 220 that I owned with a Wesco aluminum trailer, I noted that the very front part of the bow was on the forward bunks and for a small distance aft, the larger bunks did not support any part of the hull. However, as you launch the boat, you would notice that the hull would ride on the larger bunks as it was backing off the boat. I would think that is the way they are designed to work. However, there will be people on here shortly with a lot more experience than me who will be able to give you a much better technical answer.

A Few Dollars
03-15-2011, 11:24 AM
No gap


big money
03-15-2011, 11:45 AM
No gap.

Port Monster
03-15-2011, 12:14 PM
No gap. The boats weight is on the bunks the whole time out of the water (including bouncing down the road) so the more bunk you have touching the less pressure on the boat hull. Plus - you float your boat on and off of a bunk trailer so why even worry about whether the bunk fits at that particular moment (literally) when there is still bouyancy under the hull???

other line
03-15-2011, 12:34 PM
How about the back of the bunks-mine are about 6 inches from the end of the transom. Do they need to end directly under the transom. Right now my hull overhangs the bunks about 6 inches

A Few Dollars
03-15-2011, 01:08 PM
How about the back of the bunks-mine are about 6 inches from the end of the transom. Do they need to end directly under the transom. Yes

other line
03-15-2011, 01:12 PM
Thx

bone crusher
03-15-2011, 04:43 PM
hull side down

NEBassMan
03-15-2011, 10:44 PM
How about the back of the bunks-mine are about 6 inches from the end of the transom. Do they need to end directly under the transom. Right now my hull overhangs the bunks about 6 inches

You should be able to get away w/ sliding your bow stop forward by say 7" next time you dunk the boat. Tongue weight will go up though. How much? Measure your receiver sag before and after the change to see if your tow vehicle sags ALOT from the change. If not then you're ok.

Asume we're not talking about a 40ft steel hull here and you're not towing w/ a camary or such.

bamaboy473
03-16-2011, 06:52 AM
No boat should overhang the back ends of it's trailer's bunks. The transom Must be supported; especially on boats that are powered by OBs. If there's an overhang, then there's fulcrum effect performing while the trailer's being towed, and there's a LOT of stress on the un-supported transom. Either move the boat forward, or re-position the bunks rearward.

Front bunks are mostly there to help guide the boat onto the trailer. They should just barely touch the boat.

IF you choose to change the way the boat sits on the main bunks, first loosen up the front ones. Once you get the boat sitting the way you want it to, then position the fronts.

splitshot-bk
03-16-2011, 11:38 AM
thanks to all!



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