Hi Hack,
Thanks to Kingy for posting the suggested design from the Bldg Inst.
The cut-off angle suggested is the 25mm off-set. There is no regulation. This angle is for aesthetics. Any greater off-set may interfere with the location of the outer beam bolt.
The tension bolt (15 x 8 ss) is required as it removes the load from the inwale, it will be compressed if you don't have it.
Study the lower diagram; it illustrates fitting 5/4.8mm(3/16") monel or SS rivets. These rivets will reduce the sheer loads from the strap-to-beam attachment. Do not rely on just the tension and beam bolts to resist this sheer force.
The over-all length may vary but measure your existing beam for an indication. 2147mm was lifted off #1765 which has moderate hull width, wider than some, narrower than others. It has a maximum overall width of 2185mm.
I assume you will recycle major components.
Contact me direct through the MCASA if you need more info as the diagram is my production.
Phillip P

Last edited by Phillip; 10/15/14 02:30 AM.

Tortured ply is clearly beautiful.
Mozzie Aldebaran VI
1827