Re: [Paddlewise] Graphite for Bottoms

Kia Ora,

I do not know about graphite for bottoms.But one kayak manufacturer
here,mixes carburundum powder (they make grinestones out of the
stuff)with the epoxy. I have just had my boat redone.and it stops a lot
of wear when dragging a glass boat over sand or hittting a rock.
I have heard that instead of carburundum powder they used alluminium
oxide  powder which seems to be very hard,that mixed in with the epoxy
saves a lot of wear. I was told by a boat builder that they used that
stuff on the bottom of power racing boats.These boats use Water jet
engines and travel in very shallow water at high speeds,with the
expected results ,a lot of wear on the bottom were they hit the
riverbed.
I was not aware that graphite was that hard and scratch resistant?
 Eddie.

Bob Washburn wrote:
> 
> Chesapeake Light Craft's shop notes discusses adding graphite to the epoxy
> used to finish the bottom of the boat.  The Notes indicate it creates a
> tough scratch resistant, low friction surface.  My knowledge of fluid
> dynamics tells me a low friction surface has minimal effect on boat
> performance, but does it make the finish more scratch resistant?  Anyone
> have any experience with adding graphite to the epoxy finish?
>                         ,,,
>                       (o o)
> ==================oOO--(_)--OOo==========================
>                   Bob Washburn
> whiterabbit_at_iw.edwpub.com  or   rwashbu_at_siue.edu
> The only difference between a rut and a grave is the depth.
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