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RV-4 Rudder .020 skin problem

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pbesing(at)yahoo.com
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Posted: Sun Jan 13, 2008 11:08 am Post subject: RV-4 Rudder .020 skin problem

For those of you building an RV-4 or going to, and you have the .020 skin for the rudder (not sure if they are shipping it, but it is an option, and recommended to keep the trailing edge from cracking) read this and apply to your project.

  

 The drawing 7a calls for the stiffeners to extend to 3/16" of the radius of the trailing edge bend on the skin.  Do NOT put your stiffeners there.  Bring them to about 3/8" back from the radius. The reason is, the thicker material allows for less space at the radius and the skin will not be able to bend completely when it's time to "crush" the trailing edge.  I had to drill out every stiffener, shorten them, and re rivet them in place.  After I did that, it worked perfectly.  Only now, this skin isn't perfect from all the crushing I was doing on it trying to get it to bend.  

  

 For the archives.

  

 Paul Besing

 RV-4 N73DD

 Arizona 

  

  

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dcw(at)mnwing.org
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Posted: Sun Jan 13, 2008 11:54 am Post subject: RV-4 Rudder .020 skin problem

Hi Paul:

  

 I did this conversion to my flying RV (got rudder and elevator  cracks after 30 hours of flying... fortunately not painted).  I reskinned  both elevators and rudder with .020 skins and also added an additional stiffener  by reducing the spacing between what was originally laid out in the plans.   I positioned the stiffeners as you outlined below.

  

 I now have 450 hours on the airplane with a beautiful paint  job and no cracks.  I am now building an RV-7 which has .020 elevators and  .016 rudder skins but I have heard of no issues with RV-7 rudder cracks.   We'll see.

  

 Doug Weiler

 Hudson, WI

 N722DW

  

  

 [quote]   ---

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