Foam Honey-Coming Weight savings

[Ken Velez]

 Hi Jim I have a friend in NY, Scott Miller no longer flying pattern but in his time he, "weight freak", built a set of wings for the "Omen", George Asteris design, with retracts and servo at 12oz. a panel. I'm not 100% sure but I know he used .070 or 3/32 4-6oz. balsa weighed and picked the 20 lighter sheets out of bundle of 50 matched weights for the Lt and Rt panels, honey comb the foam cores then transferred the out lines to the prepared skins and like Ron said only applied glue where required to bond with the foam. Sounds like a lot of work to me and don't know how strong or how long will it last but take the retracts, wheels, retract plate and false rib and that will be a hell of a light weight wing panel.

Ken
  ----- Original Message ----- 
  From: Ron Van Putte 
  To: discussion at nsrca.org 
  Sent: Wednesday, July 27, 2005 5:53 PM
  Subject: Re: Foam Honey-Coming Weight savings



  On Jul 27, 2005, at 4:46 PM, Wayne Galligan wrote:


    My last set of wings I cored out around the fat part of the wing between leading edge and wing tube and behind the wing tube and saved .5 oz per core.   Some of the guys that honeycomb the whole wing are saving about 1 to 1.25 oz per panel.  But they  generally glass the wing and paint it too.   I hollow out the wing tips then cap them with 1/8 lt balsa wood and lighten the root rib also.  Overall this way I save about 1.25 per wing panel from the regular way.  


  I wonder how much adhesive weight is also saved, because the skin adheres to less foam. I guess it depends on whether you put the adhesive on the foam or the skin.

  Ron Van Putte


      ----- Original Message -----
      From: Atwood, Mark 
      To: discussion at nsrca.org 
      Sent: Wednesday, July 27, 2005 3:47 PM
      Subject: RE: Foam Honey-Coming Weight savings

      Well…I can’t speak for the current wing plan forms, but we did a bunch of tests on the older Arch Nemesis wings and at the time…it was a waste of time.  Granted…we weren’t quite as close to the weight limit then… but all in all we saved on average less than 1oz per panel in the finished product…about 1.75oz TOTAL in the plane.   Not bad if it was quicker to do, but at the time it was a lot of work for very little gain.
       
      Now that we’re scraping for every oz though…it might be worth re-evaluating.
       
      -M
       

      From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Jim_Woodward at beaerospace.com
      Sent: Wednesday, July 27, 2005 4:47 PM
      To: discussion at nsrca.org
      Subject: Foam Honey-Coming Weight savings
       


      Hi Guys, 

      Does anyone happen to have some experience in weight reductions from foam honey-combing?  Wing cores, stab cores, vertical fin and rudder cores?  Maybe a 25% weight reduction? 

      Thanks, 
      Jim W. 
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