It is not about the height of the mast, but about the righting moment. Also, the boom is attached to the mast so the hull does not take the heeling load. It does take all the pitching load, which is generally much smaller. Either way, 30" is enough on such a low rm boat.
The cross beam sits on top of the hull, so clearance is 30" less the draft. Should be enough. Can raise it if required. As it is a single beam, it is a little less likely to slap.
Escape hatch is a circle. 500mm/40" wide. I can get in and out much easier than I expected, although maybe not with a dry suit and life jacket on. Attachment will be either a removable bar across the inside sitting in clips, or 3 catches sitting in clips requiring it to be rotated. Either way, there will be a srew out hatch on the outside so that I can reach in and open it. The seal will be rubber window seal glued in place. Rarely sees much water so does not need to be a supertight fit.
rob
A few questions from the pictures:
1) I think you said the lw hull is only 30" high. How tall is the mast? I thought you need something like a 10% bury, and that you were going with a telescoping mast that would be 60' tall or so. What's up?2) Again with the height of the lw hull: does this mean that the crossbeam(s) will only be 2' off the water? I thought earlier discussions had determined that it would be best to be 3' or so up to avoid slapping the beams.3) The escape hatch looks to be a circle. Can you say more about how you are attaching/sealing/releasing it? Thanks,- GardnerOn Sat, Nov 21, 2009 at 12:54 AM, proaharry <harryproa@gmail.com > wrote:Foamed, glassed and bogged the ends of the ww hull. Looks ok, but did not enjoy the torture boarding.
Confirmed there was not enough room (400/16" wide) for me to install the mast bearings and supports, so I have taken a mould of the inside of the boat and will set it up on the bench, then glue it all in place. Few imponderables in this, but will sort them as we go. The top bearing (300mm/12" id) is $350 and depending on the mast/beam arrangement, i may need 3 or 4 of them, so this is one area for some more thought.
Not much to show for the next few days as there are 8 bulkheads to be laid up and installed, and I have to walk a couple of miles to wrap the tow for the beam infusion. Tempting to use uni cloth for this, but the price difference is too large.
Photos and spreadsheet have been updated.
rob