Re: [Paddlewise] Keel Abrasion, Composite Boats

In a message dated 11/8/00 4:38:31 PM !!!First Boot!!!, 
Rick.Sylvia_at_ferginc.com writes:

<< What's "oil-canning"? >>

 Rick, I felt bad that no one responded to your query. Terminology raises 
many questions from newer paddlers. I do not believe that P'wise has an 
official glossary of terms (hint, hint) but it might prove useful. J. Winters 
has several pages on his website entitled "Good Boatspeak" (I think).  I do 
not believe that "oil-canning" is covered, so, here is my version of 
"oil-canning."
   Oil-canning is a term used to describe the flexing action in a boat, 
noticeable in flat areas. Term probably originated from the action required 
to pump oil from an "old time oiling can." You know, the type Grandpa used to 
oil your bicycle chain.  
   Many definitions that I have seen for "oil-canning" describe what is in 
actuality a dent or "whoop" in a plastic boat. I do not believe that to be a 
fair definition as it does not transfer to composite boats. Physical evidence 
of "oil-canning" in composite boats may include semicircular cracks in 
gelcoat.
  For those of you in the physical mode;
     Fill a gallon milk jug with water. Invert the jug completely, holding 
the jug by the handle. Place very light pressure on the side of the jug with 
one or two fingers. You should be able to see, hear and feel the pucker and 
release as the jug empties.
   "Oil-canning"?

Bruce McC
WEO

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