Star Sailors League

**"Those prop / turbine boats go directly in to the wind. The foils (prop) and sails (turbine blades) are constantly tacking while the hull travels directly upwind. "**

   Those prop / turbine boats go directly in to the wind. The foils (prop) and sails (turbine blades) are constantly tacking while the hull travels directly upwind. 
But in terms of a conventional boat where the hull tacks then Id be surprised if it wasn't an IACC. You need a boat that is very efficient in every regard except carrying a load of lead to stop it building too much apparent. IACC fits that bill. 

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Guests Send Private Message Find Member's Posts Guest Group	Post Options Post Reply Quote Guests Quote Reply Topic: Star Sailors League Posted: 21 Dec 17 at 9:02am
	Those prop / turbine boats go directly in to the wind. The foils (prop) and sails (turbine blades) are constantly tacking while the hull travels directly upwind. But in terms of a conventional boat where the hull tacks then Id be surprised if it wasn't an IACC. You need a boat that is very efficient in every regard except carrying a load of lead to stop it building too much apparent. IACC fits that bill.

Do Different Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 26 Jan 12 Location: North Online Status: Offline Posts: 1312	Post Options Post Reply Quote Do Different Report Post Quote Reply Posted: 21 Dec 17 at 10:18am
	"Those prop / turbine boats go directly in to the wind. The foils (prop) and sails (turbine blades) are constantly tacking while the hull travels directly upwind. " Man you're frying my brain on that one . Trying to use O level physics, opposite and equal, friction losses............................. ? edit add. BTW. with their very high speeds and apparent wind moving forward what angles do foiling boats get to true wind? Edited by Do Different - 21 Dec 17 at 10:20am

Guests Send Private Message Find Member's Posts Guest Group	Post Options Post Reply Quote Guests Quote Reply Posted: 21 Dec 17 at 2:12pm
	The wind turns the turbine, which turns a propeller under water. The boat moves upwind directly in to the wind. The blades on the turbine are effectively sails, but instead of pushing the boat in a direction of travel resisted by foils like conventional boat, they rotate and power a prop, which then pushes the boat in whichever direction you choose, including directly in to the wind. The last AC cup probably had the highest apparent wind angles ever seen. But because the boats were so fast the TW angle wasn't so impressive. Edited by mozzy - 21 Dec 17 at 2:15pm