Under construction


While weights vary by diameter and wall thickness, carbon fiber is generally 200-300% lighter than aluminum with potentially twice the strenght. On the other hand, we don’t need much material and aluminum is easier to work with. My approach is to use aluminum for the initial version and testing and CF for a final version.

Paul Martin reports that if you just want to bolt a tube on to get up and running anything, from 1.75” x 17 swg is fine (commonly used in old hang gliders).

TBD: Add link to Paul’s engineering doc.


Credit: Paul Martin


Credit: Reidar Bernsten


Credit: Brendan

Boom to boom hinge connection


Credit: Charles Allen

Backplate connection

TBD: explanation. We don’t know the shear strength.

  1. Make or buy a mechanical fastener that provides both a non-crushable metal bolt sleeve as well as a top and bottom surface for the fastener: T nut, weld nut, grommet, TBD. Stainless steel is NOT epoxy friendly.

  2. Mark and drill the backplate holes.

  3. Abrade and degrease the backplate and fastener.

  4. Bond with a high strength epoxy to both sides of the hole.

  5. Clamp. Compressing with a nylon bolt may be easier than a tool.


Credit: Paul Martin

Motor mount


Credit: Paul Martin


Credit: Reidar Bernsten


Credit: Charles Allen


Credit: Charles Allen

Battery mounts




Credit: Paul Martin


Design by Charles Allen


Safety features

See Safety Checklist

Part suppliers

No attempt is made to provide a definitive list.


Wheel pants, wheel fairings

Hang glider hardware

General suppliers

  • Hobby King <>: Just about everything.

Carbon fiber


Aircraft parts