[DeTomaso] FW: NPC Probably not new to you aeroheads but wow-

[Ken Green]

What about damage to the hardened resin from the shock of an impact?  Can that be measured?
The Russians built the Alpha class subs in the late 70 with titanium hulls, I wonder why they didn't build titanium aircraft?
Lilo BenZicron (was racing a vintage Mangusta) invented a material he named Barotex (http://www.barotex.com/) to replace carbon fiber.  He made a 20 pound rear deck for me that is very rigid.  He said he visited Boeing, but because his material is new, he didn't get far with it.  I have a visit planned to his shop in Silmar to learn more about making parts from Barotex.  It is a lot cheaper than carbon fiber.
Ken
     

  From: Mike Drew via DeTomaso <detomaso at poca.com>
 To: gow2 at rc-tech.net; charlesmccall at gmail.com 
Cc: detomaso at poca.com 
 Sent: Wednesday, June 17, 2015 12:26 PM
 Subject: Re: [DeTomaso] FW: NPC Probably not new to you aeroheads but wow-
   
  In a message dated 6/17/15 11 33 50, gow2 at rc-tech.net writes:

    Ironically one of the problem with composites is repair. When you
    run
    something like carbon fiber in a solid line from wing tip to wing
    tip, if
    you punch it with an ice pick you have compromised the strength of
    the
    entire string.

  >>>...and I think that's something that may have been overlooked in the
  stampede towards CF construction of airliners.  There are a lot of
  minimum-wage boneheads driving catering trucks and whatnot that
  routinely bump into the airplanes they are servicing, causing localized
  damage.  Such airplanes are immediately withdrawn from service and
  undergo an inspection, and then often a localized patch is applied and
  the airplane is ready to go again in just a few hours.  It's not
  uncommon to see airplanes with multiple such patches on the skin;
  eventually they will go for a heavy maintenance (akin to a ground-up
  restoration in automotive circles) and then the offending panels are
  removed and replaced with new ones.
  This begs the question--how does a CF airplane respond when a bozo
  crashes into it with a catering truck?  CF doesn't 'ding' as far as I
  know.  Can localized repairs be made?
  F-1 cars may prove reassuring in this regard.  Recall that at this
  year's Montreal GP, Lewis Hamilton comprehensively smashed his car on
  the first day's practice, hitting the wall hard, pieces and parts
  flying everywhere etc.  The whole side of the car was demolished;
  however the team was able to drag the wreck back to the garage and
  rebuild it overnight; he went on to win the race.  So that gives some
  cause for optimism perhaps?
  Mike

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-------------- next part --------------
   What about damage to the hardened resin from the shock of an impact?
   Can that be measured?
   The Russians built the Alpha class subs in the late 70 with titanium
   hulls, I wonder why they didn't build titanium aircraft?
   Lilo BenZicron (was racing a vintage Mangusta) invented a material he
   named Barotex ([1]http://www.barotex.com/) to replace carbon fiber.  He
   made a 20 pound rear deck for me that is very rigid.  He said he
   visited Boeing, but because his material is new, he didn't get far with
   it.  I have a visit planned to his shop in Silmar to learn more about
   making parts from Barotex.  It is a lot cheaper than carbon fiber.
   Ken
     __________________________________________________________________

   From: Mike Drew via DeTomaso <detomaso at poca.com>
   To: gow2 at rc-tech.net; charlesmccall at gmail.com
   Cc: detomaso at poca.com
   Sent: Wednesday, June 17, 2015 12:26 PM
   Subject: Re: [DeTomaso] FW: NPC Probably not new to you aeroheads but
   wow-
     In a message dated 6/17/15 11 33 50, [2]gow2 at rc-tech.net writes:
       Ironically one of the problem with composites is repair. When you
       run
       something like carbon fiber in a solid line from wing tip to wing
       tip, if
       you punch it with an ice pick you have compromised the strength of
       the
       entire string.
     >>>...and I think that's something that may have been overlooked in
   the
     stampede towards CF construction of airliners.  There are a lot of
     minimum-wage boneheads driving catering trucks and whatnot that
     routinely bump into the airplanes they are servicing, causing
   localized
     damage.  Such airplanes are immediately withdrawn from service and
     undergo an inspection, and then often a localized patch is applied
   and
     the airplane is ready to go again in just a few hours.  It's not
     uncommon to see airplanes with multiple such patches on the skin;
     eventually they will go for a heavy maintenance (akin to a ground-up
     restoration in automotive circles) and then the offending panels are
     removed and replaced with new ones.
     This begs the question--how does a CF airplane respond when a bozo
     crashes into it with a catering truck?  CF doesn't 'ding' as far as I
     know.  Can localized repairs be made?
     F-1 cars may prove reassuring in this regard.  Recall that at this
     year's Montreal GP, Lewis Hamilton comprehensively smashed his car on
     the first day's practice, hitting the wall hard, pieces and parts
     flying everywhere etc.  The whole side of the car was demolished;
     however the team was able to drag the wreck back to the garage and
     rebuild it overnight; he went on to win the race.  So that gives some
     cause for optimism perhaps?
     Mike
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References

   1. http://www.barotex.com/
   2. mailto:gow2 at rc-tech.net
   3. mailto:DeTomaso at poca.com
   4. http://poca.com/mailman/listinfo/detomaso_poca.com