# Circumnavigation Time Estimate for a Solar & Kite-Powered Seastead
Here’s a breakdown of estimated travel times and key assumptions for a circumnavigation using wind and currents, optimized with modern forecasting.
## Travel Speed Assumptions
| Power Source | Speed (MPH) | Availability/Conditions |
|---------------------------|-------------|--------------------------------------------------|
| Kite power | 3 MPH | Within 30° of downwind |
| Solar (peak sun) | 2 MPH | ~6 hours per day, sun high |
| Solar + battery | 1 MPH | ~18 hours per day, remaining time |
| **Effective daily average** | **~1.5 MPH** | Weighted average of above modes |
## Optimized Circumnavigation Route & Timing
### Key Route Features
1. **Follow trade wind belts & major currents**:
- Northeast & Southeast Trade Winds (downwind kite possible)
- Equatorial Counter Currents (eastward near equator)
- West Wind Drift (Southern Ocean, but limited due to wave preferences)
- Gulf Stream, Kuroshio, Agulhas (where favorable)
2. **Hurricane/cyclone avoidance**:
- Schedule to avoid seasons in:
- North Atlantic (June–Nov)
- South Indian (Nov–Apr)
- South Pacific (Nov–Apr)
- Northwest Pacific (May–Nov)
3. **Wave height constraint**:
- Prefer routes with generally <15 ft waves → limits Southern Ocean exposure.
### Estimated Distance & Time
- **Earth’s circumference at equator**: ~24,901 miles
- **Practical sailing route distance** (following currents/winds, avoiding extremes): ~28,000 miles
- **Average speed over ground** (with optimized routing + currents): **~2.8 MPH**
*This includes current assist (often 1–4 MPH extra over water speed).*
### Calculation
\[
\text{Time} = \frac{\text{Distance}}{\text{Average speed}} = \frac{28,000 \text{ miles}}{2.8 \text{ MPH}} \approx 10,000 \text{ hours}
\]
\[
10,000 \text{ hours} \div 24 \approx **417 \text{ days} \text{ (continuous motion)}
\]
## Route Stages & Seasonal Timing
| Stage | Route Segment | Estimated Days | Notes |
|---------------------------|-----------------------------------------------|----------------|------------------------------------------------|
| 1 | Pacific Crossing (E to W) | 110 | Use NE trades, North Equatorial Current |
| 2 | Indian Ocean (E to W) | 90 | SE trades, monsoon avoidance |
| 3 | Atlantic (S to N) | 100 | Brazil Current, Gulf Stream |
| 4 | Pacific Return (N to S) | 117 | California Current, Equatorial Counter |
| **Total sailing days** | | **~417** | |
| **Waiting for seasons** | Hurricane avoidance pauses | **~60** | Mostly in safe harbors/calm zones |
| **Total trip time** | | **~477 days** | ≈ **1 year, 4 months** |
## Important Considerations
- **Starlink forecasting** allows real-time optimization for eddies, gusts, and currents.
- **Kite usage** likely 30–50% of daytime when wind direction favorable.
- **Southern Ocean** limited to lower latitudes (Roaring 40s minimal) for comfort.
- **Current boosts** can add 1–3 MPH over vessel’s water speed; major currents (Gulf Stream, Agulhas, Kuroshio) strategically used.
## Summary Result
**Expected circumnavigation time**:
**Approximately 1 year and 4 months** (including seasonal waiting, excluding provisioning stops).
This estimate assumes near-continuous motion, optimized downwind/downcurrent routing, and avoidance of severe storm systems.
Estimated Circumnavigation Time
~477 days
≈ 1 year, 4 months (including seasonal waiting)
Continuous sailing time: ~417 days
Note: This estimate assumes optimal use of wind and currents with modern forecasting (Starlink), avoidance of hurricane seasons, and preference for sub-15ft wave conditions. Actual time may vary based on specific weather patterns and routing decisions.