Re: [bolger] Re: More Mast Alternatives

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http://marina.fortunecity.com/breakwater/274/2000/0201/index.htm#tween



Mark Albanese wrote:

>
> Jim Michalak both puts his square sectioned spar 45 degrees
> to the boat's axis and shows how hollow wood might not be
> all that much lighter at
>
>http://marina.fortunecity.com/breakwater/274/2000/0201/index.htm#HOLLOWSPARS
>
> Mark
>
>
>
> Bolger rules!!!
> - no cursing
> - stay on topic
> - use punctuation
> - add your comments at the TOP and SIGN your posts
> - add some content: send "thanks!" and "ditto!" posts off-list.

Jim Michalak both puts his square sectioned spar 45 degrees
to the boat's axis and shows how hollow wood might not be
all that much lighter at

http://marina.fortunecity.com/breakwater/274/2000/0201/index.htm#HOLLOWSPARS

Mark

Thanks for this, Lincoln. I'd just have it lighter than a
solid one.

Mark

Lincoln Ross wrote:

>
> --- Inbolger@egroups.com, Mark Albanese <marka@o...> wrote:
> snip
> >
> > Not even an amateur scientist, I can only ask:
> > Isn't plywood strong enough to replace a plank twice its
> > thickness?
> Not unless you mean across the grain of the original plank. With the
> grain the plank is stronger. Wood is much weaker across the grain. If
> you need strength in both directions at once, plywood is better. If
> you are making a mast, I think you would end up with a lot more
> weight
> with plywood than with regular planks. Also, the thickness, position,
> and grain direction of each layer matters a lot.
>
> Isn't there more strength in the size and shape
> > of a section than in the mass of material involved?
> >
> That's not very precise, but I'd give it a yes, sort of, unless the
> load is pure tension. That's why you don't see hollow stays.
> snip
>