Magnus effect in flettner rotor

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Discussion Overview

The discussion revolves around the application of the Magnus effect in Flettner rotors on boats, specifically exploring whether a vertical rotor can create lift and how its placement affects performance. Participants consider the implications of rotor design on sailing efficiency and lift generation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants inquire whether a vertical Flettner rotor can create lift, referencing the Magnus effect.
  • There is a suggestion that the curvature of a baseball's laces, which exaggerates the Magnus effect, could be replicated in rotor design to enable upward force.
  • One participant expresses concern about the rotor becoming overpowered, potentially causing the boat's bow to submerge.
  • Another participant confirms that lift is indeed the aerodynamic force component perpendicular to the free-stream flow, indicating a basic understanding of the principles involved.
  • Questions are raised about the optimal placement of the rotor on the boat, comparing it to conventional sails that are typically mounted nearer the bow.

Areas of Agreement / Disagreement

Participants express varying opinions on the effectiveness and design considerations of Flettner rotors, indicating that multiple competing views remain regarding their application and efficiency in generating lift.

Contextual Notes

Some assumptions about aerodynamic principles and rotor placement are not fully explored, and the discussion does not resolve the implications of ground effect or the specifics of sailing efficiency.

Who May Find This Useful

Individuals interested in fluid dynamics, marine engineering, and the practical applications of the Magnus effect may find this discussion relevant.

Mr lee
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Mr lee said: ↑
hi -new but enjoyed years, wit and wisdom
Flettner rotor on a boat - ie. magnus effect

Can the vertical rotor create lift?

a curve balls 'laces' exaggerate and bend the magnus effect.
can you replicate this effect on a rotor?
--perhaps to enable another direction of force-- up
optimally I would like to gain lift -to the vertical -reduce downforce
I understand Kutta–Joukowski as it applies to a cylinder.

horizontal rotor?--unknown omidirectional sailing efficiency
ground effect used as a factor?
 
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oop
sorry,meant to say thank you
 
Mr lee said:
oop
sorry,meant to say thank you
my purpose for asking is ;where to put the rotor?
a conventional sail creates lift, so is mounted nearer the bow
 
Mr lee said:
my purpose for asking is ;where to put the rotor?
a conventional sail creates lift, so is mounted nearer the bow
I;m afraid, if the rotor becomes overpowered, it will drive the bow(s) under
 
Mr lee said:
Flettner rotor on a boat - ie. magnus effect

Can the vertical rotor create lift?
Yes, lift is the aerodynamic force component perpendicular to the free-stream flow.
 
awesome, just what was needed. thank you
 

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