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Old 10 October 2010, 13:30   #1
Country: UK - N Ireland
Town: newtownabbey
Length: no boat
Join Date: Feb 2010
Posts: 8
rigging screws

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

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Old 10 October 2010, 13:46   #2
Country: UK - England
Boat name: Angel-B
Make: Ex Y boat
Length: 3m +
Engine: Suzuki 9.9HP
Join Date: Apr 2007
Posts: 578
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.



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Old 11 October 2010, 01:24   #3
Country: UK - England
Town: Southampton
Make: Ballistic
Length: 7m +
Engine: Yam 225
Join Date: Jun 2010
Posts: 883
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
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Old 11 October 2010, 03:44   #4
m chappelow's Avatar
Country: UK - England
Town: yorkshire
Boat name: little vicky
Make: avon ex RNLI
Length: 3m +
Engine: tohatsu
Join Date: Mar 2008
Posts: 2,310
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.
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