New project: Portable Flettner-Rotor (Longboard)

flettner_longboard
3D model available on tridiv.com

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.

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