Mizzen mast foot failure
Posted 14 June 2012 - 11:06 AM
Posted 14 June 2012 - 01:13 PM
Posted 14 June 2012 - 02:00 PM
Lapwing #20 under construction
Spindrift 9N #521 - many KudzuCraft SoF kayaks
Posted 14 June 2012 - 02:19 PM
Posted 14 June 2012 - 05:50 PM
I would use a strong (fir?) solid timber mast base (made up from three or four laminations of whatever thicknesses you have handy (grain running for/aft) All extended (structural filler) epoxy - do not rely on screws for strength here - use nice big fillets everywhere..
Make the mast base wall as thick as possible by making it at least as wide as the keel batten - the side away from the c/b case that is. Maybe even let it bow it outward a bit.
The earlier idea of adding a drain channel is good and proper - again, as done in the link by Mike.
Posted 14 June 2012 - 06:12 PM
Posted 14 June 2012 - 07:45 PM
Looks like your step may have suffered from water ingress. Make yourself a new one and go sailing !!!!
CS 17 'Southbound'
CS 20 'Dawn Patrol'
Posted 14 June 2012 - 08:13 PM
Posted 16 June 2012 - 04:24 AM
EC22 # 5
Spindrift 10 # 1005
Posted 16 June 2012 - 09:22 PM
Posted 17 June 2012 - 05:21 AM
If your mast plug is HDPE as well, there should be no wear at all.
Posted 17 June 2012 - 11:24 AM
Posted 17 June 2012 - 03:13 PM
I haven't measured the groove, but a shallow groove is viable on the bottom piece. It's purely from abrasion as the mast rotates. It's very shallow and 1/16" is a generous dimension, but there is a slight groove after 3 years of sailing. I'd think a wooden bearing area, would have a considerably deeper groove by now.
Thanks for the detailed info on the HDPE mast step and the wear data is very helpful.
I like the idea of having the mast fit down over the fixed plug you described.
Did you use HDPE for the bearing at the thwart as well? If so, what kind of wear are you seeing there? - what diam is that bearing?
Thanks a lot,
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