Farrari 4 Posted May 3, 2012 Share Posted May 3, 2012 ETNZ have released a picture of what their new support craft will look like for the AC72. It's a cat with 4 x 300HP Outboards and an expected top speed in excess of 50 knts. The first of the AC72's is due to be launced June/July. It's going to be interesting watching these guys out on the harbour. http://etnzblog.com/#!2012/05/new-chase-boat-will-mother-the-ac72 Link to post Share on other sites
rigger 47 Posted May 3, 2012 Share Posted May 3, 2012 I guess they will need to get an exemption to the 12knot rule for the chase boats? Link to post Share on other sites
banaari 27 Posted May 3, 2012 Share Posted May 3, 2012 It's a cat with 4 x 300HP Outboards and an expected top speed in excess of 50 knts. A beautiful example of the 3rd-power law putting fizz boats firmly on an expensive hiding to nowhere Link to post Share on other sites
Battleship 100 Posted May 3, 2012 Share Posted May 3, 2012 What the f*ck is the 3rd power law?? Link to post Share on other sites
banaari 27 Posted May 3, 2012 Share Posted May 3, 2012 What the f*ck is the 3rd power law?? That in general, the power required to drive an object through a fluid is proportional to the velocity cubed, neglecting step-change effects such as planing. Link to post Share on other sites
Battleship 100 Posted May 4, 2012 Share Posted May 4, 2012 Ok thanks for clearing that up, I don't know why I didn't know that already Link to post Share on other sites
Atom Ant 0 Posted May 5, 2012 Share Posted May 5, 2012 What the f*ck is the 3rd power law?? That in general, the power required to drive an object through a fluid is proportional to the velocity cubed, neglecting step-change effects such as planing. Does that mean that it will be expensive? Link to post Share on other sites
Grinna 2 Posted May 5, 2012 Share Posted May 5, 2012 Does that mean that it will be expensive? Come on AA ... this is the America's Cup we're talking about here! They're all about controlling costs in the interests of a fair competition that has the greatest appeal to the viewing public, while being an international sporting spectacle! Link to post Share on other sites
ScottiE 174 Posted May 5, 2012 Share Posted May 5, 2012 But he does have a point. It's a cat so the planing 'step change' will be pretty quick. I reckon they've gone this way to give them the ability to reach speeds approaching 60kts quickly and efficiently. This not unlike the drug running boats out of central and south America, the windies, DR etc. they'll be planning to have to overtake the ac boat to head another boat off further ahead - the AC boats will likely exceed 40kts. Old lead- winging theories don't apply no more! Link to post Share on other sites
PaulR 3 Posted May 5, 2012 Share Posted May 5, 2012 - the AC boats will likely exceed 40kts. I think you will find they will AVERAGE 40kts, if knot more . . . Link to post Share on other sites
Guest Posted May 5, 2012 Share Posted May 5, 2012 Tis getting very exciting. Gone are the days we can go out and follow then around tho Link to post Share on other sites
Clipper 343 Posted May 5, 2012 Share Posted May 5, 2012 I think you will find they will AVERAGE 40kts, if knot more . . . Not a chance in hell of that. Link to post Share on other sites
Guest Posted May 6, 2012 Share Posted May 6, 2012 I think you will find they will AVERAGE 40kts, if knot more . . . Not a chance in hell of that. It would be interesting to see what they average in 25 knt winds with semi flat seas. Link to post Share on other sites
Guest Posted July 12, 2012 Share Posted July 12, 2012 EMTNZ have just launched their chase boat ahead of the AC72 launch Link to post Share on other sites
Guest Posted July 20, 2012 Share Posted July 20, 2012 The story I heard was that they have a limited amount of time allowed for on the water testing under the rule. this time starts as soon as the tow is dropped. Therefor they need a tow boat that can get the hell out of Doge bloody quick if the wing powers up. Expect tow speeds in excess of twenty knots down the harbour. wonder if that contravenes maritime law?? Link to post Share on other sites
philstar 61 Posted July 21, 2012 Share Posted July 21, 2012 did any one see this thing screaming out of the harbour at about 5pm of the simrad 50. man it was flying!!!! Link to post Share on other sites
rigger 47 Posted July 21, 2012 Share Posted July 21, 2012 The story I heard was that they have a limited amount of time allowed for on the water testing under the rule. this time starts as soon as the tow is dropped. Therefor they need a tow boat that can get the hell out of Doge bloody quick if the wing powers up. Expect tow speeds in excess of twenty knots down the harbour. wonder if that contravenes maritime law?? They can apply to the Akl HM for an exemption to the 12knot rule that applies to power boats. Link to post Share on other sites
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