I'm all for using wood for many things, but it seems to me that the amount of stress the mast step is subjected to is a good reason to build the replacement out of aluminum. Any small welding shop should be able to fabricate a substitute for the original wood structure at very little cost that could then be epoxied into place and should outlast the boat.
Rich Knowles Indigo. LF38 Halifax On 2013-08-06, at 20:37, "Persuasion" <persuasio...@gmail.com> wrote: As always Google has the answer. http://workshopcompanion.com/KnowHow/Design/Nature_of_Wood/3_Wood_Strength/3_Wood_Strength.htm#strengthchart Mike S/V Persuasion C&C 37 Keel/CB Long Sault > From: Steve Thomas <sthom...@sympatico.ca> > Date: 6 August, 2013 19:15:01 EDT > To: <cnc-list@cnc-list.com> > Subject: Re: Stus-List C&C 30 mast step yet again > Reply-To: cnc-list@cnc-list.com > > Maple is not very rot resistant, but oak is. > There is a reason why oak was the material of choice for ship building. > > -----Original Message----- > From: CnC-List [mailto:cnc-list-boun...@cnc-list.com]On Behalf Of Ronald > B. Frerker > Sent: Tuesday, August 06, 2013 4:24 PM > To: cnc-list@cnc-list.com > Subject: Stus-List C&C 30 mast step yet again > > Got the engine running, so I could shift the mast over to work on the step. > (BTW trouble was in the battery cables; corrosion inside the sheathing). > I have only two supports and the oak plank I used bowed in the middle; > probably because I didn't seal the edges well enough and water wicked in. It > did last 10-15yrs though. So based on what a lister mentioned, I'm going to > put in a third support in the middle. I can only buy 3/4 marine plywood by > 4x8 sheet. So I'm going with solid wood for the support. The hardwoods > dealer suggested mahogany, but it seems to porous for a bilge. A friend > suggested ipe (epay or ironwood). Extremely dense and used in lock gates on > the river. He claimed that some don't even treat it. > I'm using maple (very dense) instead of the oak I used last time for the > horizontal plank; oak apparently is known to bend readily with moisture, > especially steam. > I'm planning to coat all with a few coats of epoxy which I think Dennis > suggested; the hardwoods dealer suggested marine poly. > So, given I'm going with wood instead of a wood/metal combination, are there > any suggestions about which wood and the coating? > Ron > Wild Cheri > STL > > _______________________________________________ > This List is provided by the C&C Photo Album > http://www.cncphotoalbum.com > CnC-List@cnc-list.com _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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