The idea come while reading “Symmetry of Sailing” by Ross Garret. The german engineer Anton Flettner was the first to use this physical principle as propulsion engine for a ship in 1922.
The still difficult part and open points to discuss that I have in this Winter project are:
- Material to use in the main structure. The goal is that is light, when possible less than 10 Kilos, but resistant since it needs to provide lift.
- Motor weight: 170 g Speed controller: 230 g . Cables + Battery: Aprox. 2 K. Making a total of 2.5 Kilos weight.
- Still open to discuss: At what speed needs the cilinder to roll and what would be the ideal diameter to provide enough momentum to move 70 Kg in a Longboard (I thought about 40 cm diameter).
The chain relation between the motor and the cilinder to have the right speed and force. Ex: 10 spin motor: 1 spin cilinder
- And to end the question: What kind of lift will this generate on a 10 Knots wind, coming from the optimal point, let’s say 90 degrees left or right from the cilinder.