Core in a mould ?

Discussion in 'Fiberglass and Composite Boat Building' started by nevilleh, Nov 15, 2010.

  1. Coen
    Joined: Aug 2004
    Posts: 30
    Likes: 1, Points: 0, Legacy Rep: 39
    Location: The Netherlands

    Coen Junior Member

    The shear modulus of a balsa 100 kg/m3 is around 110 N/mm2. PET (Airex T92) will give you a shear modulus of 21 N/mm2.
     
  2. Herman
    Joined: Oct 2004
    Posts: 1,618
    Likes: 89, Points: 48, Legacy Rep: 1240
    Location: The Netherlands

    Herman Senior Member

    Manufacturers. (edit: Thank you, Coen)

    For moulds stifness is what counts, more than impact resistance (people working your tool with a sledgehammer should be ehhmm, eliminated).


    But as I stated: All types of stiffening is better than no stiffening at all.
     
  3. Coen
    Joined: Aug 2004
    Posts: 30
    Likes: 1, Points: 0, Legacy Rep: 39
    Location: The Netherlands

    Coen Junior Member

    Sorry, I didn't see / forgot that it was concerning the mold. I thought it was about the hull. Sorry for that.

    For the mold, go with balsa.

    Cheers
     
  4. War Whoop
    Joined: Jun 2003
    Posts: 661
    Likes: 16, Points: 0, Legacy Rep: 84
    Location: Sunny Ft Lauderdale Fla

    War Whoop Senior Member

    Never will use wood , but see post #9
     
  5. War Whoop
    Joined: Jun 2003
    Posts: 661
    Likes: 16, Points: 0, Legacy Rep: 84
    Location: Sunny Ft Lauderdale Fla

    War Whoop Senior Member

    I have built a lot of first rate molds and chose to use first rate material every time,Yes balsa will work but why use a second rate core in block form of varying density.
     

  6. War Whoop
    Joined: Jun 2003
    Posts: 661
    Likes: 16, Points: 0, Legacy Rep: 84
    Location: Sunny Ft Lauderdale Fla

    War Whoop Senior Member

    Point is some of the testing methods do not work on the resilient cores. Once again, when they do what you pay the big money for the test will indicate that movement as failure and mark that as a absolute value.
     
Loading...
Similar Threads
  1. dbstormchild
    Replies:
    3
    Views:
    2,401
  2. Highwater
    Replies:
    1
    Views:
    3,221
  3. Midday Gun
    Replies:
    10
    Views:
    303
  4. keith66
    Replies:
    14
    Views:
    590
  5. Doran M. Oster
    Replies:
    27
    Views:
    926
  6. Toepfer Marine
    Replies:
    7
    Views:
    467
  7. Mark C. Schreiter
    Replies:
    12
    Views:
    1,768
  8. Mark C. Schreiter
    Replies:
    33
    Views:
    2,427
  9. fallguy
    Replies:
    7
    Views:
    532
  10. tuna_fan
    Replies:
    5
    Views:
    688
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.