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Old 28 October 2014, 19:33   #21
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Quote:
Originally Posted by ShinyShoe
there isn't much to a trailer.
Hey, watch it!
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Old 29 October 2014, 02:09   #22
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I get phone calls on a pretty much daily basis from people asking if I have any second hand trailers in stock. The usual answer is no, but I can offer a new one for not a vast amount more and they almost always loose interest. I find this hard to understand. Yes they might be saving a bit on the purchase price, but the chances are that the saving will be all but wiped out in maintenance costs down the line.
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Old 29 October 2014, 06:03   #23
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I've only ever owned "lesser" used smallcraft than many of the RIBs here and I've never bought one with a properly maintained trailer yet.

One comes to mind not that many years back where I travelled to NW Wales to buy a small "fast fisher" boat. Hull and outboard were as described and the guy says "I've greased the bearings and checked the trailer over so it's OK for your trip home" (some 250mls).

I wanted the outfit so drove home with fingers crossed. Then to sort the trailer I replaced....

Hubs, wheels, tyres, mudguards & brackets, keel rollers & U bolts, side rollers & clamps and winch... then set it up so all the rollers were actually in the right place for the boat.
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Old 29 October 2014, 16:09   #24
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From VOSA's IVA manual for trailers;

"2. A secondary coupling must be fitted to all unbraked trailers. Note 2"

"Note 2: A secondary coupling can only be used on braked trailers not fitted with a breakaway cable with a maximum mass not exceeding 1.5 tonnes.
This cable attaches the trailer to the towing vehicle whilst towing and provides a secondary link. A secondary coupling is a legal requirement for all unbraked trailers."

Here's mine on my new trailer build, 6mm (because a 3mm breakaway cable isn't a secondary coupling).
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Old 29 October 2014, 18:19   #25
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Originally Posted by Poly View Post
YES I think that might be the point ShinyShoe is making (badly!) - secondary couplings are more often than not unrated and it requires the driver to be intelligent enough to specify a suitable system.
That's a cracking point Poly/ShinyShoe, VOSA says


"5. The coupling device must bear an e or E mark to ensure the construction of the coupling device meets the appropriate approval criteria."


The secondary coupling is a "coupling" primary/secondary it's still a coupling. Mine isn't CE marked and I'm hoping that when I present my new trailer for its IVA I don't get a VOSA bloke who's having a bad day and insists on seeing the CE mark on the wire rope.
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Old 29 October 2014, 18:32   #26
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Glad I have a new braked cable with the obligatory breakaway brake cable supplied. Saves me wondering if I'm legal or not!!


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Old 30 October 2014, 05:59   #27
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For my unbraked trailer I just use a standard breakaway cable (designed for braked trailers/caravans) that is attached to the jockey wheel bracket so it won't come off (unless the bracket falls apart!) And so far has been useful to stop the trailer rolling down Littlehampton Harbour's slipway when I unhitched it!
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Old 30 October 2014, 07:19   #28
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I guess we would prefer to be spending money on the boat - the item that gives us enjoyment, rather than the trailer which is simply a necessary evil.

I was quite happy to pay the bill for the new tubes this spring, will be less happy to pay the bill for the trailer service shortly.
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Old 30 October 2014, 15:31   #29
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Quote:
Originally Posted by MrHeadsocket View Post
For my unbraked trailer I just use a standard breakaway cable (designed for braked trailers/caravans) that is attached to the jockey wheel bracket so it won't come off (unless the bracket falls apart!) And so far has been useful to stop the trailer rolling down Littlehampton Harbour's slipway when I unhitched it!
OK let's assume the slip is 1:8 its at an angle of about 7degrees.

Let's assume trailer and boat combined has a mass of 1000kg and gravity exerts of force of 10N/kg perpendicular to the horizon.

I think that means the force on the secondary coupling is 10 x 1000 sin (7) which is about 6500N - so 65% of the boat+trailer weight.

Breaking strain of 3mm wire rope seems to be in this sort of region. So no major surprise it was fine.

But what happens if the pulling vehicle is travelling at 60mph (26m/s)... And the load is applied suddenly... Let's assume the trailer was doing 60mph and stopped in 1 second flat it decelerated at 26m/s2 if that's a 1000kg load that means a deceleration force of 26000m/s2 or 26000N. That sounds to like a wire with a breaking strain of 2.6T is needed...

Is 1second too short a time or too long? I don't know...
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Old 30 October 2014, 15:56   #30
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Quote:
Originally Posted by ShinyShoe View Post
OK let's assume the slip is 1:8 its at an angle of about 7degrees.

Let's assume trailer and boat combined has a mass of 1000kg and gravity exerts of force of 10N/kg perpendicular to the horizon.

I think that means the force on the secondary coupling is 10 x 1000 sin (7) which is about 6500N - so 65% of the boat+trailer weight.

Breaking strain of 3mm wire rope seems to be in this sort of region. So no major surprise it was fine.

But what happens if the pulling vehicle is travelling at 60mph (26m/s)... And the load is applied suddenly... Let's assume the trailer was doing 60mph and stopped in 1 second flat it decelerated at 26m/s2 if that's a 1000kg load that means a deceleration force of 26000m/s2 or 26000N. That sounds to like a wire with a breaking strain of 2.6T is needed...

Is 1second too short a time or too long? I don't know...
Shiny!! I think that your nickname should be ..."Poly's Apprentice" from now on
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