Hi-res photo gallery: Emirates Team New Zealand’s AC72 foil sailing

Posted on 07 September 2012 by Valencia Sailing

After the past week of speculation over the capabilities of the Emirates Team New Zealand new AC72 catamaran, the team decided to publicly release some footage of it in action.

Emirates Team New Zealand’s AC72 foil sailing on the Hauraki gulf. Auckland, 6 September 2012. Photo copyright Chris Cameron / Emirates Team New Zealand

Emirates Team New Zealand’s AC72 foil sailing on the Hauraki gulf. Auckland, 6 September 2012. Photo copyright Chris Cameron / Emirates Team New Zealand

Emirates Team New Zealand’s AC72 foil sailing on the Hauraki gulf. Auckland, 6 September 2012. Photo copyright Chris Cameron / Emirates Team New Zealand

Emirates Team New Zealand’s AC72 foil sailing on the Hauraki gulf. Auckland, 6 September 2012. Photo copyright Chris Cameron / Emirates Team New Zealand

Emirates Team New Zealand’s AC72 foil sailing on the Hauraki gulf. Auckland, 6 September 2012. Photo copyright Chris Cameron / Emirates Team New Zealand

Emirates Team New Zealand’s AC72 foil sailing on the Hauraki gulf. Auckland, 6 September 2012. Photo copyright Chris Cameron / Emirates Team New Zealand

Emirates Team New Zealand’s AC72 foil sailing on the Hauraki gulf. Auckland, 6 September 2012. Photo copyright Chris Cameron / Emirates Team New Zealand

5 Comments For This Post

  1. Genghiz Says:

    I am puzzled about the fact that they appear to be sailing with 2 ‘foils’ on the port hull and only 1 (the aft foil) on starboard: the forward foil on starboard seems to be retracted.

    Can anyone shed light on this? My guess is that three foils gives better stability, like a three-legged stool or a camera tripod.

  2. gmhendo Says:

    Genghiz Given the amount of lift generated to lift a 72 foot catamaran the drag profile must also be huge. Leaving the windward foil down would generate more but unnecessary lift (boat is already foiling) and significant extra drag.

    You may be right about stability, and it may also have something to do with the helm as well. Time will reveal a lot more, especially as other teams develop their own versions of the AC72.

  3. John F Says:

    AC72 rules were made to make foiling a little more difficult. Rule states windward foil can’t have any affect on righting moment and so windward foil can not be in the water.

  4. AndrewW Says:

    If you are correct about the rule you quoted “Rule states windward foil can’t have any affect on righting moment” (and so windward foil can not be in the water) doesn’t explain why they raise the windward foil.

    The foils generate lift only (not down force – unless fore / aft angle of attack can be pivoted, but I’m pretty sure it cant)
    To assist the righting moment, the windward foil would need to generate down force so I presume it’s for drag reduction only.

  5. Laurence Says:

    Hi Andrew, I think what John F is saying is that the teams have a set amount of time (just under a minute I think) to get the windward foil up within 100mm of the float after changing tack. This rule was made in an attempt to keep the boats from foiling.

 

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