Holds the line
Virtually eliminates flex under operating loads.* Your wing holds its angle.
Takes one for the wing
In a crash, it's designed to give way instead of the wing.**
Bench-tested. Flight-tested.
Every Tendon grade is flex and impact tested on WingBones test rigs, and each plane's Tendon design has been flown.
What Tendon is
The fiber goes where the load goes.
Tendon puts continuous carbon fiber just underneath the surface of the joiner, laid along the path the flight loads take. The fiber is embedded in a red polymer that bonds with the WingBones carbon fiber composite around it.
That is the red you can see on a Tendon joiner.
Illustrative close-up
Available now
Three joiners. All tested.
Introductory pricing through November 30, 2026.
Your angle
Standard or custom, in 0.5° steps.
Free shipping in the USA
On every Tendon joiner.
Ships fast
Usually ships in 2–3 business days, subject to demand for Tendon joiners.
Volume discounts
The same as on every WingBones joiner.
More to come
Want your joiner in Tendon?
Tell us your plane. Requests decide which joiners get Tendon next.
Flying a plane we don't list? Contact us and we'll send you a measurement form.
* Operating loads: pilots flying the Challenger and Prestige 3PK reported no visible flex in flight. Results vary by airframe.
** No breakaway design is perfect.
† Illustrative close-up, magnified. The fiber layout varies by joiner.
These are not OEM joiners and are not officially endorsed by original equipment manufacturers unless otherwise noted.