24mm Sorbitol motors:
After flying one of the D16 sorbitol motors (final draft design version) I did a post flight "autopsy" and found the paper casing looked like new. No internal burn marks. The plastic liners took all the damage. The orange marks are the Ultra Copper used to help seal during construction:
Nozzle end on the left:
The clay nozzle diameter was 5 mm After the launch it showed no erosion and measured 4.8 mm due to some slag buildup.
Static thrust curve in EngEdit:
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Time flies like an arrow, but Fruit flies like a banana !