[NSRCA-discussion] Obechi

[Ed Skorepa]

Nat, the cores must be as accurate as it gets. Otherwise, there is not much room to fix it. Do you cut your own? I don't use vac bagging (too much troubles). I have a press. Also, I don't use the white shacks to press the wing in. Instead, I cut another set of wings from Formular 600 pink foam and then using these shacks for actual pressing. I know, sounds like a lot of work but the result is unsurpassed (light and precise wings). ed
  ----- Original Message ----- 
  From: Nat Penton 
  To: NSRCA Mailing List 
  Sent: Sunday, February 26, 2006 4:05 PM
  Subject: Re: [NSRCA-discussion] Obechi


  Ed
  What problems would I have vac bagging the .022 obechi ? I normally use a high ( 2.5) taper ratio and not sure if the quality of the core will be adequate.          Thanks     Nat           
    ----- Original Message ----- 
    From: Ed Skorepa 
    To: NSRCA Mailing List 
    Sent: Sunday, February 26, 2006 4:26 PM
    Subject: Re: [NSRCA-discussion] Obechi


    Nat,

    I used to make Obechi sheeted sailplane wing for Slegers International back in the early nineties, so I can say I have a fair amount of experience. The stuff I was using had density of 18 lb/cu ft. The thickness was just 0.022", so it was like sheeting the wing with 1/16, 6lb Balsa which is btw hard to get today. The wings had hard surface (compare to balsa) and were at least twice as strong. Before making any finish, I filed the grain with the lite spackle (more on this later if you're interested).

    Back then, I was buying Obechi from Barry Kennedy at www.kennedycomposites.com  You can also try Ed Whyte at WHYTE WINGS, 616-698-8668. There is also outfit in Washington state which sells the Obechi, but you have to buy bulk, something like $3k minimum.

    The Obechi is a great stuff and inexpensive, 14" wide, 11' long sheet about $12. However, it requires different techniques. Because of thickness, there is no room for mistakes. ed
      ----- Original Message ----- 
      From: Nat Penton 
      To: NSRCA Mailing List 
      Sent: Saturday, February 25, 2006 3:54 PM
      Subject: [NSRCA-discussion] Obechi


      I can't find any info on the density, or where to buy obechi wing skins.Also, how difficult is it to fill if you glass amd paint ?                                Nat


--------------------------------------------------------------------------


      Internal Virus Database is out-of-date.
      Checked by AVG Free Edition.
      Version: 7.1.375 / Virus Database: 267.15.6/257 - Release Date: 2/10/2006



--------------------------------------------------------------------------


      _______________________________________________
      NSRCA-discussion mailing list
      NSRCA-discussion at lists.nsrca.org
      http://lists.nsrca.org/mailman/listinfo/nsrca-discussion


----------------------------------------------------------------------------


    _______________________________________________
    NSRCA-discussion mailing list
    NSRCA-discussion at lists.nsrca.org
    http://lists.nsrca.org/mailman/listinfo/nsrca-discussion 


----------------------------------------------------------------------------


    Internal Virus Database is out-of-date.
    Checked by AVG Free Edition.
    Version: 7.1.375 / Virus Database: 267.15.6/257 - Release Date: 2/10/2006



------------------------------------------------------------------------------


  Internal Virus Database is out-of-date.
  Checked by AVG Free Edition.
  Version: 7.1.375 / Virus Database: 267.15.6/257 - Release Date: 2/10/2006



------------------------------------------------------------------------------


  _______________________________________________
  NSRCA-discussion mailing list
  NSRCA-discussion at lists.nsrca.org
  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.nsrca.org/pipermail/nsrca-discussion/attachments/20060227/c4bfaf00/attachment.html