New inside liner for propellant casting tubes

To allow for effective bonding of the sugar propellant to the aluminium casting tubes, tubes were sanded with grain 60 and degreased. Subsequently, a 0.5mm layer of plain cotton cloth was glued on the inside of the retainer.

The cotton cloth is an improvement over the previously used kraftpaper, as the kraftpaper could be easily split into two separate layers. Furthermore, airpockets can be easily removed underneath the cotton layer.

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