Moderator: GreenLake
Rakozy wrote:In my boat, the keel [centerboard] pivots on a 4" round nylon core and held in place by two trapezoid shaped fiberglass blocks.. These blocks are held in place by the two stainless straps and bolted to the bottom of the hull. [...]
I hope this attached photo is useful to someone else in understanding your DS II.
SUNBIRD wrote:Re: Picture of DSII centerboard downhaul
Postby SUNBIRD » Mon Mar 24, 2014 7:31 pm
https://forum.daysailer.org/forum/download/file.php?id=243
Stuff under the water line, through-hulls near the water line, and anything that may be exposed to significant amounts of fuel, like the diesel deck fill, should also not be bedded using Butyl, since butyl dissolves in petroleum products.
[...]
While you probably could use butyl below the water line I don't, and use marine sealants instead such as Sikaflex 291 or a Polysulfide instead. 3M-101 is no longer marketed so you are left with Boat Life Life-Calk as the sole marine grade polysulfide. I never liked Life-Calk as much as 3M 101 but it's still better than "Satan's Glue", AKA 3M 5200.
#5 Tube Caulks - When you need to use a tube caulk for deck fittings choose one with LOW ADHESION. Polysulfides like Life-Calk are generally the lowest in adhesion but Sikaflex 291 @ 260 PSI and 295 UV @ 160 PSI are both less than 3M 4200 @ 300 PSI or 3M UV 4000 @ 300 PSI and a better choice IMHO. I generally prefer Sikaflex 295 UV for deck stuff and Sika 291 for below water, both 295 UV and 291 are polyurethanes with a 500% elongation rating.
Sikaflex®-291 is a 1-component, marine grade polyurethane elastomeric adhesive and sealant. Used by many boat builders, its fast cure time makes it ideal for applications where speed is important.
Users browsing this forum: No registered users and 20 guests