To deliver the ideal flavor ratio of 50% chocolate and 50% mint in each chocolate shamrock shake sip, McDonald’s partnered with engineering firms JACE and NK Labs to create the Suction Tube for Reverse Axial Withdrawal (the STRAW). Its innovative j-shape provides optimal flavor flow dynamics.”It was a puzzling assignment but one with an ambitious goal. From a physics perspective, it’s actually quite difficult to deliver a proportional amount of both chocolate and mint flavors with each sip. But that’s exactly what we did. It’s a marvel of fluid dynamics. Thanks Fibonacci sequence,” said Seth Newburg, principal engineer and managing partner at NK Labs. Continue reading for a hands-on video and more information.
“Due to the STRAW’s unique design, only 2,000 were produced in time for Shamrock season. The STRAW will be available in select participating restaurants with the purchase of a Chocolate Shamrock Shake,” according to the press release.