[NSRCA-discussion] Obechi

[Nat Penton]

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


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