On 09/22/20 19:44, Curt Laumann via AMSAT-BB wrote:
Over the past few months I've been designing & assembling a few 70 cm Lindenblads. The current version is shown in the attached picture (link below). Arrow shafts are used for parasitic elements. The shafts are bonded in place with fiberglass resin. Rubber end caps (from McMaster) cover the shaft ends.
The notable part of this design is the central structure (supporting parasitic elements) is 3D printed as *one part*. Virtually all of the angles and spacings are achieved in the 3D printing process. After struggling to align and bond various PVC and irrigation parts in other versions, it was a breeze to assemble this design: one nylon machine screw, one nut, four bonding points.
The design could be easily modified to accommodate 0.125 inch diameter parasitic elements as well.
Hello Curt,
It appears you and I had the same thought.
Look for an upcoming article, already submitted, in the AMSAT journal about my design. The OpenSCAD source files and STL files will be available.
--- Zach N0ZGO