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http://www.drivethrurpg.com/product/216526/Deep in the Gobi desert, there lies the Kingdom Agarthi. Once a powerful empire ruled by ruthless snakemen and their human underlings, the snakemen are now a distant memory, and the humans mostly feud and plot among themselves. Only now and then, one or another of the factions sends out an expedition to trade with the humans out there, the Mongol steppe nomads to the North, or Chinese villagers to the East. For gold and precious stones, they barter slaves, food, and news from the outer world. This is the only time Agarthanian sail wagons are ever seen outside the desert...Sail wagons are an exotic means of transportation, but they are ideally suited for dried out salt lakes or flat desert plains. In reality, the ancient Chinese used them, and they made a very minor comeback in modern times. But the idea is sound and workable with medieval or even ancient technology.
This document contains three different sail wagon designs that can be included into your campaign world:
1) A cargo sail wagon – used to transport goods and optimized to run with a small crew
2) A scout sail wagon – fast and optimized to tack. Same stats can be used for private pleasure crafts
3) A battle sail wagon – full of soldiers, mostly used for escort duty or punitive raids
Each wagon comes with schematics and tables for top speed, dependent on wind speed and wind direction. Wagon speed is given in meters per second, kilometers per hour, miles per hour, and feet per game round (10 seconds).
Sail wagons are suitable for medieval, fantasy and post-apocalyptic game worlds. This supplement gives you all you need to incorporate it into the game system of your choice.
http://www.drivethrurpg.com/product/216526/And for those who are interested in the physical backgrounds I used to calculate the speed values I give:
http://www.drivethrurpg.com/product/216527/