• If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

  • You already know Dokkio is an AI-powered assistant to organize & manage your digital files & messages. Very soon, Dokkio will support Outlook as well as One Drive. Check it out today!


Final Testing

This version was saved 12 years, 9 months ago View current version     Page history
Saved by Nikolas Osvalds
on May 13, 2011 at 8:21:10 pm

Back to Third Prototype Page


Final Testing Page



The goal of the final testing was to see if the shrink wrapped balsa wing would meet the performance requirements that I set.


Final Performance Requirements

  • For apparent wind angles of 0-90deg (0 deg is in the direction of motion of the cart), the wing sail should create at least 50% more forward pulling force on the cart than the soft sail.


  • The wing sail should be able to create forward pulling force on the cart at closer apparent wind angles than the soft sail.


After the first round of testing I thought more about how the wing should perform. I decided that the performance of the wing versus the soft sail was the most comparable at apparent wind angles of less than 90deg. At any larger angle than this the soft sail is not creating lift, and will naturally produce more force than the wing because of its larger sail area. The wing however should still out perform the soft sail while on the water. The reason for this has to do with the apparent wind. Apparent wind is the wind that is felt by the sail when moving through the water and takes into account the velocity of the vessel as well. The true wind is what is felt by a person standing on land or not moving on the water.

    So taking this phenomenon into account, as soon as the catamaran with the wing starts moving forward quickly the apparent wind angle will move forward as well. Therefore as long as the wing outperforms the soft sail at less than 90deg apparent wind, it should technically outperform it at most points of sail.

     Since the apparent wind angle moves forward when going forward it is also important that the boat can sail at close apparent wind angles. This is why I set the second requirement that the wing be able to create forward force at closer angles to the wind than the soft sail.


Testing Set-up



Comments (0)

You don't have permission to comment on this page.