1. Bob A Feet

    *Very* Quick Jetpack Question - Tube Diameter

    Hey everyone, I've been gathering materials and managed to get some cardboard tubes for my (eventual) jetpack build. Looking at the designs on Thingiverse by stormtrooperguy, it seems like the side tubes are 3" diameter and the middle one is 4", correct? I picked up 12 tubes total: 4x3"...