New SIB Trailer

jonnyhas · 06 March 2011, 13:56

just thought i would post pics of my sib triler i am in the process of making, one question that i am looking for some suggestions is the position of the axle? i want to weld this but am trying to work out the best position to get the right balance is there any simple fix or is it just tack it a see how it works? i have a 30hp on her just now but will no doubt change to a 40 at some time, i was thinking of placing it 1/3 from the rear is this sensible place to start?

jyasaki · 06 March 2011, 20:16

Sounds a little far forward to me. Most of the weight will be motor and transom; I would be looking at about 1/4 as a starting point. Make sure you have the facility to move the axle, though, if you aren't sure about placement to begin with. Having the trailer balanced makes a big difference in how it tows.

jky

jonnyhas · 03 April 2011, 10:55

just thought i would update with progress not far away now just need to put the boat on it for some final setting out, axle etc, then strip down bunks and final paint.

m chappelow · 03 April 2011, 12:20

Its looking well,
though to me the bunks may want to come back a little ,i have always had the transom supported by the bunks ,especially if towing with a large engine on it stops the engine/transom flopping/rocking about on rough roads if the boat is only supported in the middle.
though once you get the boat on the trailer you will get a better idea on the nose weight and set up ,,looks good .

is that you boat in the next doors garden lol

jonnyhas · 03 April 2011, 17:09

hello, thought i would add some more pics just did first test fit so i can do the final setting up before painting. no not my sib under the tarp next door neighbour has a 4mtr yamaha, if you look at the rear of the trailer at the first roller you will see 2 no rubber pads these are where the transom will sit down on when i get them at the right height, the bunks will only be supporting the tubes, thats the plan anyhoo. so some little mods to do before the paint, reduce the length of the draw bar about 200mm, move the winch post closer to the boat by 50mm and heighten the back rubber's the guessed axle position seems to be well balanced so will weld it in place.

Northern Pike · 20 April 2011, 14:07

Don't weld your axle. Use U bolts like your winch post so you can always fine tune and adjust it.