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The first edition of the cup is a simple aluminum cylinder that accepts the Diaphragm at one end via grub screws. It is a simple aluminum cylinder with measured dimensions:
| Thickness (t) | 1" | |
|---|---|---|
| Inner Radius (ri) | 5.725" | |
| Length (l) | 14" |
Ground testing has shown that the cup does not buckle under normal piston operating loads, even those as high as 3500 lbs as we predict we saw in Ground Test November 10, 2017.