how far off bunks

[SOUTH JERSEY WALT]

about how far should the transom hang off off the rear of a bunk trailer

 

[Watermann]

Re: southjerseywalt

Re: southjerseywalt

The stern has all the weight with the motor so less is better. Post of picture of the set up is the best way for us to let you know if you need to make an adjustment.

 

[SOUTH JERSEY WALT]

how far off bunks

about how far should boat hang off end of rear bunks

 

[smokeonthewater]

Re: how far off bunks

absolute max.... 0"

 

[SOUTH JERSEY WALT]

Re: southjerseywalt

Re: southjerseywalt

thanks boat still in water new boat new trailer i think maybe three or four inches would not be to much

 

[Maclin]

Re: southjerseywalt

Re: southjerseywalt

I think 0" is what to shoot for, 3-4" is too much in my opinion.

 

[achris]

Re: how far off bunks

Please don't post the same question twice. Thank you.

Both threads are now merged.

iBoats Mod team

 

[NYBo]

Re: how far off bunks

impatient? Your DUPLICATE thread is getting answers this one is closed

Welcome to iboats!

No, it's not!

 

[jayhanig]

Re: southjerseywalt

Re: southjerseywalt

I've got mine hanging off maybe an inch... just enough to be sure the pitot doesn't get broken off.

 

[04fxdwgi]

Re: how far off bunks



Actually, the bunks should extend and inch or two past the transom. The transom is where a lot of the weight is and should be well supported when trailering, especially on bumpy roads. If you wory about transom mounted accessories, perhaps they should be mounted away from the area of the bunk.

 

[SOUTH JERSEY WALT]

Re: how far off bunks

That was my first time posting had title wrong .wont happen again

 

[achris]

Re: how far off bunks

That was my first time posting had title wrong .wont happen again

Hello Walt,

No problem, and thanks for understanding. It does get confusing for both yourself and other members posting to your threads, that's why I merged the two threads together.

If you realise you have the wrong title after you make that first post, you can 'edit' that (first) post, then click 'GO ADVANCED' and change the title...

Chris....

 

[bonz_d]

Re: how far off bunks

I understand the concept and the arguement but please answer me this.

There are many here in this forum including myself that use roller trailers and have been for many years. A roller trailer will not work with the roller out past the end of the transum. A hull does not change dynamics because of the trailer it is on. So why do bunk users insist that the bunks need to extend beyond the boat?

My current boat is a 1988 16' Alumacraft that has always been on a roller trailer and the bottom is not warped, deformed or weakened and neither is the transom and until last winter has had a 1988 70hp Evinrude 3 cylinder hanging off the back! I have also wittnessed much larger outboard boats with much larger engines on them that have been on roller trailers and none of them have a problem either.

 

[smokeonthewater]

Re: how far off bunks

the last roller needs to be as near as possible to the transom.... Generally roller trailers are very good at distributing weight evenly across the length and width of the hull... often you can walk up to a roller trailer and pull any one roller away from the hull by hand... not so w a bunk trailer.... VERY hard to know if a large percentage of the boat's weight is setting on the back of the bunks

why don't you explain to us WHY you asked this question and WHY you need the answer to be 3-4"........ Why can't you just move the boat forward so that the transom is supported?

 

[bonz_d]

Re: how far off bunks

why don't you explain to us WHY you asked this question and WHY you need the answer to be 3-4"........ Why can't you just move the boat forward so that the transom is supported?

Suppose it's just curiosity as to why people think bunks need to extend past the boat. Nothing is gained by it. Also many times I see bunks that extend well past the point that they are attached to the support. Which when laid flat wood will distort when weight is applied to the end. Same as the center will when trying to span a long distance.

 

[WIMUSKY]

Re: how far off bunks

Can you move the winch post 3 - 4" forward so the transom doesn't extend beyond the bunks?

 

[bonz_d]

Re: how far off bunks

Moving the post 3-4" may work in some cases. In others it could easily change the weight distibution and the tongue weight.

 

[JimS123]

Re: how far off bunks

It somewhat has to do with the type power. An I/O carries the engine forward, thus + or - 3" probably won't matter. But, for an outboard, bunks longer than the boat are probably in order.

My aftmost roller sits as close to the transom as it can without having the boat fall off.

Many years ago I parked my boat for the winter and didn't notice that after my last trip out i had winched it up too far. The transom went off (forward of)the last roller. The closes one was 3 feet away. By Spring the hull had been warped beyond repair.

 

[bonz_d]

Re: how far off bunks

It somewhat has to do with the type power. An I/O carries the engine forward, thus + or - 3" probably won't matter. But, for an outboard, bunks longer than the boat are probably in order.

My aftmost roller sits as close to the transom as it can without having the boat fall off.

Again, please explain. Why the differeance with a bunk trailer over a roller trailer? As you yourself have stated rollers past the end of the boat does not work well. So why would an outboard need longer bunks that extend past the boat?

 

[JimS123]

Re: how far off bunks

Again, please explain. Why the differeance with a bunk trailer over a roller trailer? As you yourself have stated rollers past the end of the boat does not work well. So why would an outboard need longer bunks that extend past the boat?

Bunk trailers are OK for I/Os, but questionable for OBs. The highest static downward force of an I/O is several feet before the transom, and the force is distributed across the stringers. ALL of the force of the outboard is withing an inch of the back of the boat, and directed right at the keel.

An OB needs keel support right at the transom.

Now, for those of you that will say BS because you did it ypour way and it was OK, I say to you how long do you intend to keep the boat? Three years then move up?...OK then. The next guy will be complaining and writing to the forum asking why his boat doesn't perform.