Initially the ballast engine was modeled after a previous build for an open source underwater glider (https://hackaday.io/project/20458-osug-open-source-underwater-glider). The syringe design was low cost and elegant however we quickly discovered that the syringes would bind and it did have a very low pressure rating despite upgrading the drive motor from a Nema-17 to a Nema-23. For this reason the ballast design was reformatted to use a High pressure pump combined with a reservoir. This would allow for the glider to reach greater depths and therefore become more energy efficient.
The following figure was a test of just the new pump design.
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