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1. The smallest sail that could compete today with diesel power for commercial shipping would be a kite with a wing span over 30 ft.

2. One critical technology for transport sail craft is electronic flight control.

3. Much larger kites may bring the cost per horsepower hour down from around $.10 to $.01.

4. Launch and retrieval present the greatest technical challenge.

5. As oil prices rise in the 21st Century, the case for transport sail craft becomes much stronger.

6. Thanks to major development in the last decade in recreational traction kites and UAV's, wind assisted commercial shipping will soon be viable.

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