Tabernacle(s) for Mast

Greg

It's amazing how easily memory can play tricks. I just checked and you are right

It's a completely different boat I was thinking of, and it was one transposing over the other. Must be an age thing!!!

I'll send you a couple of updated photos, and when I start the renovations in earnest, will keep you up to date

Thanks

Perry

Sent from my iPhone

dear all,
coming period I would like to have a tabernacle as well. maybe next year, but I can start already. I have a question about the 4 bolts (picture of the tabernacle in the description of the modification) through the basement, roof and wooden block (inside against the roof). Do I really need those 4 bolts? and if yes can somebody give measures (as for holes in the basement of the new tabernacle); the widt; I presume the length is the wooden block; the roof and the basement of the tabernacle + two times the screw thickness?

thanks in advance.

Hi Joop,

I am not an expert, but my belief is that the base of the mast is largely under compression. However, there will be a constant sideways loading because of the pressure of the wind. Some of that is taken by the shrouds, of course.

As you know my experience with a tabernacle is reported at:
https://www.seahawk17.org.uk/owners-custom-sailing-tabernacle.php
You can see the original mounting plate for the mast in the third photo down the page at:
https://www.seahawk17.org.uk/boat-description-rigging.php

My recollection is that the original plate had only three bolts in it that were slightly thinner than those shown on the tabernacle page.

Be aware also that as you put the mast up and down it has zero compression loading and quite a lot of sideways loading... and a tabernacle increases that in order to ease lifting and dropping.

My base (not tabernacle) has 4 bolts and I wouldn’t want to reduce that, especially if adding tabernacle cheeks.

Thanks

Perry

Perry's right!

Re-reading my post, it might look as if I was suggesting the extra bolt was unnecessary, but if you can justify fitting a tabernacle then you can expect to be using it and that means a lot more "unusual"  pressures not experienced by a mast that stands upright throughout the sailing season.

Hi Joop,
If you're ever in the area feel free to drop by and look/check/measure how it's constructed on our Seahawk.
Cheers
Rene

Dear all, Thank you for your responses.
you made it clear and I will use 4 larger bolts then the three bolts there are now.
@Rene; it would be great to see how the problem is fixed on your boat. If it is not bothering you too much: Is there a possibility I can visit you and your boat the coming period?
kind regards,