Originally Posted by Andy Young2
I am refurbishing a 6.5m Libra Rib with 2x Yam 75's. It is apart at the moment and tubes are with Paul Tilley for replacement. The boat is in Muscat and has been stored and launched by tractor from a basic trailer which is now u/s.
I want to make a road trailer to take the boat to launch sites for diving.
i have the trailer pictured below but side rails are rotted out. I plan to cut the independant axles off and the triangular 'front end' and then add 2 new rails with cross beams, keel rollers and bunks. i would be grateful for advice on:
First size of box to use for main rails. i am thinking 120 x 50mm - any advice?
Secondly size of box for cross members (say 4)
Finally positioning of twin axle. I have access to measure the axle layout of the same size of rib on a professionally built single axle trailer. I can measure the position of the single axle in relation to say the stern of the rib and mark that point on my on my new trailer. However where should I position the twin axles in relation to the single axle mark. Axles centred equidistant around it, rear axle centred on mark etc...
many thanks in advance
Any idea on what your boat will weigh ?
I'd go 120mm x 50mm x 6mm for your rails and then run a smaller rail (30mm x 30mm x 4mm) above it with some 120 mm off cuts as spacers to make two ladder sections.
I would run the two 30mm box sections onto the existing front triangle to give you an overlap of joints and also weld brace sections under the 120mm x 50mm box to give you a stronger join.
I think it's best to bolt the cross members to the rails with U bolts so you can move them and use them to mount the keels rollers. I'd do the same with the axles so you can move them forward and backward along the rails to suit your boat's loading. I bolted my axles to two long cross members with short rails at either end so you can then use these as fixing points for the bunks mud guards etc and it spreads the load.
If you want any pictures give me a shout