Strong points for Jordan Drogue
We have had our L450 for 6 months now and have done about 6000 Nm, mostly in the Med. We are now heading toward the Canaries
and then across the Atlantic. In preparation I am doing several modifications.
Here my design for the the attachment of the Jordan drogue
. Many professional skipper
don't use any drag devices, but I want to be able to put the boat in a safe condition even if the autopilot
fails. I plan to lash the rudder
to center. The brake on the wheel
is not strong enough so use lines on the wheel
too. Deploy the drogue and go to sleep until the storm abates or you get your strength back and want to deal with it in an active fashion.
During this trip we have often been rafted together during anchoring
with another L450. Power boaters have thrown us some big waves and we could see the aft cleats
move significantly under the shock loads. So much that we thought they would pull out. A few weeks back I removed the rope
box under the cleat to see what is going on in there. Just 2 square washers about 50mm in size support the cleat and no other visible beefing up of the laminate. Anyway, the cleat position would have the bridle
lines for the drogue chafe on the aft stations, so the attachment point had to be moved further aft.
The design for the strong points reinforces the cleats
at the same time, giving me confidence that in a marina with swell (we had two or three of them already) the cleats will not be ripped off. I will reinforce the forward cleats a similar manner in time as well. I will again use a top and bottom plate. On the aft cleats I could see how they had already compressed the laminate which could lead to failure as well.
The design consists of two stainless steel
plates. The top one is 10mm thick, the lower one 5mm. All have the same hole pattern. Two holes are for the cleat bolts, the others for the 10mm bolts for extra compression
onto the fibre glass for a well distributed load transfer from the bridle
, through the stainless into the laminate.
The longer plate is longer and polished and has a hole at the end for a shackle.
It goes on to of the side deck
. The shorter plate goes underneath. Both are connected via four 10mm through bolts and the two 18mm cleat bolts.
The underside of the laminate is quite bumpy and also somewhat curves down toward the aft. I am planning to put some mastic polyester with fibreglass in it on the lower plate and then bolt it to the top pate again to bridge the peaks and valleys.
The pictures are from the work in progress. I still have to clean up the Butyl caulking and do the mastic polyester levelling.
Here is the exact design as manufactured in Palma. We paid 200 Euro for a complete set for one boat. Our buddy boat is getting the same strong points.
Shot 2012-10-23 at 01.43.43 .png
Size: 34.2 KB
ID: 48748" style="margin: 2px" />