[Rhodes22-list] Mast Mount Issue

[Stephen Staum]

Thanks Roger. Good to have you back. I think I filled the holes with
plastic wood a few years ago & it worked for a while. I did drill out the
rotten material before filling with epoxy. I think I have a solid base to
attach to now. I’ll let it cure  until Wednesday then drill & remount the
base.

Pray for a safe mast raising.

Stephen

On Mon, Jun 10, 2019 at 6:03 PM ROGER PIHLAJA <Roger_Pihlaja at msn.com> wrote:

> Stephan,
>
>
>
> Besides the pivoting winch & ginpole on the foredeck, are you also using
> Stan’s mast crutch at the stern to raise the mast as high as possible prior
> to the start of the lift?  Without going into the nasty mathematical
> details, mast raising is a vector force problem.  From the point of view of
> shearing force at the mast mount/cabin roof joint, the critical time is
> right at the beginning of the lift.  As the lift proceeds and the mast
> angle gets steeper, more and more of the weight of the mast is directed
> down into the cabin roof, where the load is taken up by the mast
> compression post and there is less and less shear force on the mast
> mount/cabin roof joint.  The more you can lift the mast up from the stern
> at the start of the lift, the lower will be the initial shear force on the
> mast mount/cabin roof joint.  Obviously, pushing near the bottom of the
> mast during the lift also adds to the shearing force while contributing
> little to the lift; but, you already knew that!
>
>
>
> Now that you’ve already stripped out the screw holes, I would rebuild them
> using epoxy thickened with fumed silica.  Be sure you drill out any rotten
> wood, caulk, etc before you fill the holes.  To assure a good bond to the
> cabin roof, first paint the inside of the holes with unthickened epoxy.
> Let it soak into the sides of the holes and let the epoxy kick off; but,
> don’t let it completely cure.  Depending on temperature, 15-25 minutes is
> the appropriate time to wait.  Then, fill the holes with thickened epoxy
> and let it completely cure, say overnight.  You want the epoxy thickened to
> the consistency of peanut butter.  By not letting the unthickened epoxy
> completely cure before adding the thickened epoxy, you will achieve a much
> stronger, waterproof bond with the cabin roof.  It’s also cheap insurance
> against any future water intrusion into that critical joint.
>
>
>
> Hopefully this helps.  Good luck!
>
>
>
> Roger Pihlaja
>
> S/V Dynamic Equilibrium
>
>
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for
> Windows 10
>
>
>
> ________________________________
> From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> on behalf of
> Stephen Staum <snstaum at gmail.com>
> Sent: Monday, June 10, 2019 5:29:54 PM
> To: The Rhodes 22 Email List
> Subject: Re: [Rhodes22-list] Mast Mount Issue
>
> Yes.  I have Stan's mast system.  I did not epoxy the mount in place, but I
> did rebuild the worn screw holes with epoxy.
> Pray for a safe mast raising.
>
>
> *Stephen Staum*
>
> *s/v Carol Lee 2*
>
>
> On Mon, Jun 10, 2019 at 11:16 AM Lowe, Rob <rlowe at vt.edu> wrote:
>
> > Stephen,
> > You do not want to epoxy the mast step to the cabin top.  The mast step
> is
> > designed to break loose, likes yours did.  Are you using the mast crutch
> > and the mast raising system? - rob
> >
> > -----Original Message-----
> > From: Rhodes22-list <rhodes22-list-bounces at rhodes22.org> On Behalf Of
> > Stephen Staum
> > Sent: Sunday, June 9, 2019 10:43 AM
> > To: The Rhodes 22 Email List <rhodes22-list at rhodes22.org>
> > Subject: Re: [Rhodes22-list] Mast Mount Issue
> >
> > Thanks Graham. I will head out to the mooring shortly - epoxy in hand.
> >
> > Stephen
> >
> > On Sun, Jun 9, 2019 at 9:04 AM Graham Stewart <gstewart8 at cogeco.ca>
> wrote:
> >
> > > Stephen:
> > > I would definitely use epoxy rather than plastic wood. You really
> > > don't want water to work its way into the cabin top and I would not
> > > trust plastic wood even with sealant.
> > >
> > > I know that there has been discussion about not bolting the mast step
> > > to the cabin top, for the reason you mention, but filling damaged
> > > screw holes with epoxy should not be a problem.
> > >
> > > The fact that the screws came out so easily would make me want to
> > > check the condition of the core in the area just to make sure the
> > > core, if wood, is still solid.
> > >
> > > Graham
> > >
> > > -----Original Message-----
> > > From: Rhodes22-list [mailto:rhodes22-list-bounces at rhodes22.org] On
> > > Behalf Of Stephen Staum
> > > Sent: Sunday, June 9, 2019 8:04 AM
> > > To: The Rhodes 22 Email List
> > > Subject: [Rhodes22-list] Mast Mount Issue
> > >
> > > Dear All,
> > >
> > > I am having a problem with my mast mount attachment to the cabin top.
> > > When launching last Sunday, a well meaning friend pushed up from the
> > > cockpit intending to help the winch to lift the mast but instead
> > > popped the mount off the cabin top. I attempted to reseat it using
> > > ribbed metal strips that grip the holes and the screws.  The screws
> > > all seemed to be tight but when raising the mast yesterday the mount
> > > popped off again just at the mast left the stern crutch.  Nothing
> > > broke and nobody got hurt but I am back to square one.
> > >
> > > I remember past discussions about not using epoxy for the repair as it
> > > is supposed to give rather than tear out the cabin top if anything
> > > goes wrong.  I am planning to fill the holes with plastic wood, drill
> > > pilot holes and rebed the mount.  I am also considering 1/2" longer
> > > screws for more bearing surface.
> > >
> > > Any thoughts or suggestions are welcome and appreciated.  I could not
> > > find the past discussions on nabble.
> > >
> > > Thanks,
> > >
> > > *Stephen Staum*
> > > *s/v Carol Lee 2*
> > >
> > > *Needham, MA*
> > >
> > > --
> > Stephen Staum
> > Pariser Industries, Inc.
> >
>
-- 
Stephen Staum
Pariser Industries, Inc.