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Old 11 March 2012, 12:57   #21
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In this case you never know what the trailer was carrying before this particular boat or even how it was loaded up in this example. If the drawbar was overloaded and subjected to a cyclic 'bouncing' effect then its inevitable that something was gonna give....at some point or another.
This trailer was brand new and had only had only carried the one boat a total of five miles. It was loaded by QAB, who have loaded numerous boats for me in the past and are always very careful.

Looking at the fairly central position of the axles (see below) and the fact the boat had 2 hefty outboards on the back, I cant see how the nose weight can have been excessive. Even if the nose weight was a bit high, I have towed numerous steel trailers in the past with excessive nose weight and never had any problems.
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Old 11 March 2012, 13:39   #22
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Originally Posted by SW RIB Charter View Post
This trailer was brand new and had only had only carried the one boat a total of five miles. It was loaded by QAB, who have loaded numerous boats for me in the past and are always very careful.

Looking at the fairly central position of the axles (see below) and the fact the boat had 2 hefty outboards on the back, I cant see how the nose weight can have been excessive. Even if the nose weight was a bit high, I have towed numerous steel trailers in the past with excessive nose weight and never had any problems.

Hmmm, the plot thickens....

If there are snapped welds the length of the trailer it would suggest to me an overloading problem or a defect in the welding process. Visually the welds look OK from what i can see but visually eyballing a weld is hardly conclusive.

As AMac already suggested, the dimensions of the profiles used dont seem to correspond with a trailer designed to carry nearly 3.5t...

If the trailer is genuinly designed to carry the coresponding load, is it possible it was shock loaded when the boat was loaded onto it?

I wouldnt expect to see weld failures on the swing beam clamp from any kind of cyclic stress as that area shouldn't be flexing as much as say, the main longitudinals....

Simon
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Old 11 March 2012, 14:17   #23
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Originally Posted by SW RIB Charter View Post
Here are a couple more photos taken this afternoon. The first one shows the front of the trailer where it broke away. It looks to me like the weld has just failed. The second shows another weld on the rear swing beam, which also looks to have failed. There are several other split welds right down the trailer.
Could always be the welds failed due to it 'connecting' with the LR that was pulling it , or the shock loads the whole front end hit the floor ? Just an option ...
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Old 11 March 2012, 14:34   #24
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sad times
yep, just reading it, I was thinking the same as PeterM, if there has been catastrophic failure of one part, then has that carried through to other bits?
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Old 11 March 2012, 15:25   #25
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Looking at their website none of their designs have the double box side rails meeting at a point, so unless this was a new design the whole trailer is totally out of shape.
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Old 11 March 2012, 15:40   #26
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This is mine (albeit a single axle) those top rails are at least 18" apart
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Old 11 March 2012, 15:44   #27
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And this is a pic of a larger twin axle much more similar to the damaged one
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Old 11 March 2012, 15:47   #28
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Do we know the unfortunate driver?

It might have happened if the towball wasn't engaged properly, hopped on the first big breaking run and the frame hit the road...

...just a possibility?
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Old 11 March 2012, 16:38   #29
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After a quick gander on their website,it looks like one of their Kittiwake range to me.

To me,the drawbar arrangement looks like a fracture waiting to happen at exactly the points that one's failed at.
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Old 11 March 2012, 16:40   #30
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IIRC, the website seems to suggest that Gullwing only produce 'multi roller' type trailers up to 2600kg..........? The 3500kg ones all seem to be of the 'roller ramp' type.

The pictures posted clearly show stickers saying 'multi rollers' and the fact it has swing beams seems to support this.

Was the trailer acvtually plated at 3500kg?

If i havent mi-understood and the trailer was only 2600kg then there probably wasn't much room for error.

.
1700kg boat + outboards + gear etc.....?



Simon
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