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Old 12-29-2009, 01:09 PM
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dgerr dgerr is offline
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The December 2009 issue of Westlawn's free journal, The Masthead, is posted

The December 2009 issue of The Masthead is now posted and ready to read.

To read The Masthead, you must have a current version of ADOBE ACROBAT READER. (If The Masthead doesn’t load correctly, you probably need to download an up-to-date verion of Acrobat Reader. Go to: )

Highlights in this edition:
  • PassageMaker/Westlawn Design Competition Winners
  • Westlawn / 80 Years Young and Still Going Strong
  • Splashes
  • We Get Mail
  • Westlawn Student Alan Gluyas Builds his Design
  • Know-It-All Question
  • Westlawn/Profiles Pat Bray N.A.
  • News & Views
  • Technical Article: All About Cores - Part 2
  • ABYC Tech Notes: Saildrive Conundrum
  • Continuing Education for Designers, Boat Builders, & Techs
  • Training Links & Events
  • Back Issues of The Masthead
ABYC Tech Notes:
The Saildrive Conundrum
"What is not so rare are massive corrosion problems with these drives, to the extent that with lax inspection and maintenance regimens, they literally dissolve off the bottom of the boat. This is occurring for several reasons that are design specification related, which is why this article should be useful to Westlawn students and graduates, as well as boat builders, marine techs, and surveyors."

Read the entire article in this issue.

An Excerpt from the Tech. Article:
All About Cores Part 2
"Once vacuum bagging has been conquered, then vacuum infusion is the next logical step. With vacuum infusion, a full atmosphere (14.7 psi) is applied over the whole laminate which has been installed dry. Because you are working with dry fabrics and core, there is no time constraint to lay the fabrics and core in exactly the orientation desired. Once the dry full laminate is installed, a vacuum bag is drawn over the full part, and resin forced (sucked) under the bag under a full atmosphere of pressure, wetting out the whole laminate. In vacuum infusion, there are no voids anywhere in the laminate and no "never bonds", and always exactly the same amount of resin used each time, achieving optimum glass to resin rations, and consistent predictable physical properties. Vacuum infusion has allowed composites to be treated as a true engineered material, much like steel and aluminum. This is what has allowed the US Navy to infuse the deck house on the DDG-1000 destroyer currently being infused with balsa core and carbon fiber by Northrop Grumman Ship Building in Gulfport Miss."

Read Part 2 in this issue of The Masthead.
For Part 1, go to the September 09 issue

Go to:

to read The Masthead (allow a few moments for the file do download), and be sure to click on the "Click Here To Subscribe" at the bottom of the first page to receive the next issue automatically.

You can click on:

To see all back issues and read whichever one you want.

Dave Gerr
Director, Westlawn Institute
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