# The Sunwake Project

> A 15 m stitch-and-glue plywood and epoxy solar-electric cruising
> catamaran for four, built by its owner, with a professionally
> engineered 352 V electrical system. Preliminary, for design
> development — not for construction.

This site is a published git repository. Every figure in the documents is
produced by the Python package under /calc/, and the derived data is
served as JSON and CSV under /data/. If a document and the code disagree,
the code is the design.

## Start here

- [Design summary, machine-readable](https://sunwake.web.app/data/design_summary.json): the
  whole boat in one JSON object — particulars, hydrostatics, speeds, ranges,
  clearance margins, and the model's own uncertainty statement
- [Conventions for agents](https://sunwake.web.app/AGENTS.md): coordinates, the power
  reference plane, what is settled, and where a critique would be worth most
- [Repository overview](https://sunwake.web.app/README.md)

## Documents

- [Design brief](https://sunwake.web.app/docs/01-design-brief.md)
- [Design specification](https://sunwake.web.app/docs/02-design-specification.md)
- [Lines plan SW-LP01 Rev 0a](https://sunwake.web.app/docs/03-lines-plan.md)
- [Hull form study: how many facets should a chined hull have?](https://sunwake.web.app/docs/04-hull-form-study.md)
- [Construction](https://sunwake.web.app/docs/05-construction.md)
- [Materials takeoff: plywood, glass and epoxy](https://sunwake.web.app/docs/06-materials-takeoff.md)
- [Power and energy](https://sunwake.web.app/docs/07-power-and-energy.md)
- [Accommodation: berths in the hulls](https://sunwake.web.app/docs/08-accommodation.md)
- [Generator selection](https://sunwake.web.app/docs/09-generators.md)
- [Electrical architecture and insurability](https://sunwake.web.app/docs/10-electrical-and-insurability.md)
- [Cutting the kit: hire or own](https://sunwake.web.app/docs/11-cnc-and-kit.md)
- [Engaging a naval architect](https://sunwake.web.app/docs/12-naval-architect-engagement.md)
- [Build timeline and cost](https://sunwake.web.app/docs/13-build-timeline-and-cost.md)
- [Open engineering questions](https://sunwake.web.app/docs/14-open-questions.md)
- [Sources and references](https://sunwake.web.app/docs/15-references.md)

## Data

- [Hull surface](https://sunwake.web.app/data/hull.json): 181 stations of every longitudinal
  curve, the tabulated offsets, the sectional area curve, the arrangement
- [Hydrostatics](https://sunwake.web.app/data/hydrostatics.json)
- [Power curve](https://sunwake.web.app/data/power_curve.csv)
- [Twin-hull interference](https://sunwake.web.app/data/interference.csv)
- [Seasonal energy balance](https://sunwake.web.app/data/solar_monthly.csv)
- [Weight ledger](https://sunwake.web.app/data/weight_ledger.csv)

## Conventions

- Metric; knots and nautical miles retained. Currency mid-2026 USD.
- x aft from station 0; z from the design waterline, positive up; y is a
  half-breadth from the demihull's own centreline.
- Power is always DC electrical input at the high-voltage bus.
- Absolute powers carry ±25–30 % uncertainty; variant comparisons are far
  tighter. Residuary resistance is calibrated, not predicted.