STC Showcase: Wing Ribs

Just like people, airplanes have skeletons too—and like humans, they give shape and structure as well as strength.  An airplane’s wing ribs provide the wing’s vital contours as well as support structural loads in flight.  If there’s one thing we’re known for, it’s some seriously durable ribs.  Dakota Cub ribs are engineered to provide a substantial improvement in strength over original Piper ribs.

Top to Bottom: original Piper rib, extruded Dakota Cub rib, stamped rib

The t-shaped cap strip on an original rib is folded metal, which lacks the strength of the extrusion on a Dakota Cub rib

What makes it stronger?  An extruded aluminum cap strip provides not only torsional rigidity but strength in the compression axis as well.  What does this mean for you?  Alaskan users see the strength of our ribs regularly—when clearing snow off of the wings of airplanes that have spent the night outdoors, they don’t have to worry about deforming the ribs removing snow.   Our ribs have been tested to over 2,400 lbs gross weight in certification testing for the Super 18, so yes, we’re pretty sure they’ll hold up.

Stamped rib structure: although it looks light, it is actually slightly heavier than a Dakota Cub rib

Surprisingly, our beefy ribs (which have been described as being “built like the proverbial brick shit house”) weigh slightly less than a new stamped rib.  They are a bit heavier than original Piper ribs with a gain of 3.5 lbs/wing.  However, the strength and longevity of our ribs will keep your Cub happy and hassle-free for years to come.

Dakota Cub ribs feature a modernized version of the original Piper structure, with a much stronger extruded cap strip

Our ribs are direct replacement parts, so installation time will be the same as installing Piper ribs.

Can I Use It?

Our wing ribs are approved for installation in the following models:

  • J3C-40, -50, -50S, -65, -65S both wood and metal spar
  • J4, J4A-S, J4A
  • J4B
  • J4F
  • J4E (Army L-4E)
  • J5C
  • PA-11, PA-11S
  • PA-12, PA-12S
  • PA-14
  • PA-22-150, 22S-150, 22-160, 22S-160
  • PA-18, PA-18S, PA-18A, PA-18 “125” (Army L-21A), PA-18S “125,” PA-18 “135” (Army L-21B), PA-18A “135,” PA-18S “135,” PA-18 “150,” PA-18A “150,” PA-18S “150”

For more information, contact us at or give us a call at (605) 757-6628!



About dakotacub

Dakota Cub is the manufacturer of the Super 18 family of aircraft. We are also a supplier of FAA PMA'd parts for various Piper aircraft models no longer supported by the factory. We have numerous STCs for improved parts and other upgrades as well.
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One Response to STC Showcase: Wing Ribs

  1. Pingback: Wing Sale! Price Increase May 1st | What's Up at Dakota Cub

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