Hoverbike Of The Future for $40,000 Portaledge. A5 Portaledge Hammocks were used by climbers before portaledges were developed.
A portaledge is a deployable hanging tent system designed for rock climbers who spend multiple days and nights on a big wall climb. DIY Electric gyroscope. Riley writes in with how he made his own DIY “electric gyroscope” - “I used one of those clear dummy cds that can be found at the top and bottom of spindles.
I made a 4.5 volt battery pack out of 3 AA’s and used a motor out of a CD player I salvaged.