rigging screws

[mark mckee]

Hello again folks. Saw a picture in the threads of a sib with what looked like rigging screws connected between floor and transome.It looked to be a good idea to me and was wondering if there was advantage in doing this.I have a seapro4.70 with a30 hp four stroke.

Thankyou Mark

[chris123]

The older SIBs (the 3.5 metre Y boat and the now replaced 5 metre EA16 D class) the RNLI use have these bottlescrews between the front floorboards to put a bit of tension in the floor.

They do work well, but I would not want to put them into a SIB that is not designed for them - you will end up introducing stresses and loads into the boat that the manufacturer has not designed it to take.

Cheers

Chris

[Starovich]

we used to put them on the orange Jeanneau plastic boats as a matter of course, if you didnt, the transom would split in a couple of seasons. this approach made them last lots longer

[m chappelow]

A few inflatables had them fitted as standard from new ,,think Dunlop was one of them ,,which helped stiffen up torque twist on the transom when fitted with a large engine and a heavy payload ,down side is that they then got in the way and took up extra room in the boat ,Though they need a good solid floorboard to fix to , the ply /foam sandwhich types would need some big backing plates to spread the load .if the working sponson pressure is correct there should not be any need for them unless perhaps using a larger engine .

The screw set up that chris123 is on about is just for tensioning the floor and only really works if not using multi floorboards and the thrust board is right up at the front of the bow so it spreads the load evenly .
as in the pics below.