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Old 11 August 2017, 06:28   #1
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Country: UK - England
Town: Mansfield,Nottinghamshire
Make: Honwave T38IE
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Folding Road Trailer

Hi All

Has anyone made or use one of these, I do not have the space to store a ridged one, I have seen the leisure trailer http://www.leisure-trailer.co.uk/index.htm but it is far to expensive for me, this got me thinking that I would be able to build one myself and use aluminum instead of stainless steel box section, this would keep the cost down and also the weight, I think I would be able to modify the design to utilize bunks instead of rollers to give more support, I have already drawn the hinges and the brackets for the axle on Cad and would cut these out of Stainless for the additional strength and wear resistance, all of the other fittings would be bolted on to avoid any welding, any input and ideas on unforeseen problems would be most appreciated.
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Old 11 August 2017, 12:27   #2
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Have a search I think it's been done and recently
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Old 11 August 2017, 12:56   #3
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Country: UK - England
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I haven't built one, but I do own one, exactly that make, and and have used it throughout the summer. It's a well made, very good piece equipment. Quite a pain to collapse completely, but when we go away with the caravan, it means we can take the boat and trailer too with just one car, which means we can trailer the boat about to different places once we've unhitched the van and set up. Let me know if you need any bit photographing !
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Old 12 August 2017, 02:56   #4
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Is it type approved?

Making your own and getting it approved might present extra challenges.

Aluminium is "bendy-er" if I'm not mistaken. And you will have to have some plain steel parts which will introduce galvanic corrosion headaches. Aluminium boat masts with stainless fittings screwed in are a real world headache. I imagine this would be similar...

It will be a small market for the RIB world... you still need to store the boat. I can see a market for the small open boat world that sits on a swing mooring during summer and comes out at winter. But on the whole trailer storage costs at harbours etc are relatively low...
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Old 12 August 2017, 03:57   #5
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RIBase
Welcome to the forum.

Aluminium is lightweight but you do have to be a bit careful with joint details and geometry. Try to ensure that that you don't have any sharp (particularly internal) corners or abrupt discontinuities as aluminium is more susceptible to cracking than steel.

The grade of aluminium is also important. Some grades are not corrosion resistant at all. 'Standard' marine aluminium is generally 5083 for plate and 6082 for sections.

You could consider getting it hard anodised. This will make it tougher.

Aluminium is at one end of the galvanic table and stainless is at the other. As a result you should try and keep the two materials isolated from one another - plastic washers, plastic film or where stainless fastenings are involved - Duralac painted on to the surfaces reduces corrosion.

My De Graaf trailer is put together with U-bolts which might be a route you could consider taking.
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Old 14 August 2017, 03:15   #6
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Folding Road Trailer

Thank you for all your input, I had not considered the galvanic problem, I have had a look and it appears that titanium is ok with aluminum and I have access to some, so I think I will go with that for the hinges and the axial bracket, thank you for your offer PeteG, I would like some dimensions if possible from the hitch to the axial also the width as I'am aware that if it is to long it will not follow the towing vehicle round a corner, my SIB is a Honwave T38IE 48Kg and need a trailer for the same reasons PeteG, my next dilemma is what suspension units to go for and wheel size I think the smallest i have seen are rated at 150kg and the next size up would be 250kg, I would not be carrying the outboard on the back but would have the fuel tank, life jackets etc so I think the 150KG would be superficial but do you think this would make it bouncy when being towed, I have included my drawings of the hinges and axial plates.
Attached Files
File Type: pdf bracket1.pdf (8.2 KB, 16 views)
File Type: pdf bracket 2.pdf (7.5 KB, 9 views)
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Old 14 August 2017, 03:16   #7
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Folding Road Trailer

Cannot add to attachment, here is the second.
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Old 14 August 2017, 05:01   #8
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Folding Road Trailer

Hopefully i have managed to attach the photos of the hinge and axial plate, I have put some bolts through the hinge to show how it should work, the bolts that go through the box section will have a tube sleeve on the inside to stop it compressing when tightened up, I will put some more photo's on when I have attached the parts to the box section.
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Old 13 September 2017, 04:54   #9
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Country: UK - England
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Folding Road Trailer

Ok a quick update if any one is interested, I have attached the brackets to the box section and the hinges appear to be working, please ignore the bolts I have used these were left over from a previous project, when I have it fully assembled I will order the correct size for each location.
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Old 13 September 2017, 13:23   #10
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Looking good so far. Keep me posted how it's coming along as I would like to build my own. But not very capable with welding so the more bolt together I can make it the better.
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