WindPush: find wind when it blows

WindPush is a smartphone app that alerts you whenever the wind you're longing for is forecasted.

Daniel Hjertholm and Daniel Wold are two passionate windsurfers from Norway. Not knowing when and where the wind was blowing was a problem both shared for a long time.

"The idea for WindPush has been on our minds for a while. We've both spent hundreds of hours browsing through different wind sites and forecasts in desperate search for the perfect wind", explain Hjertholm and Wold.

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Anders Bringdal: 45.47 knots at Luderitz | Photo: Luderitz Speed Challenge

Records have started to fall in the first day of the 2014 Luderitz Speed Challenge, in Namibia as the world's best windsurfers and kiteboarders taste the power of the local wind in their sails.

The stakes are high. The harbour town of Luderitz greeted sailors with winds ranging between 20-25 knots and stronger gusts of up to 30-35 knots. After the initial tests and adjustments, the windsurfers hit the channel.

Anders Bringdal clocked at 45.47 knots to earn the highest windsurfing speed of the day. Patrik Diethelm came close with 45.15 knots on his last run. Not bad for the first day of competition.

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Windsurfing sails: working with the wind | Photo: NeilPryde

Windsurfing sails use the power of the wind to generate forces, which push and/or pull your board forward. Let's dive into the wonderful world of wind science.

Wind generates power. We know that. All we need is to observe its behaviour both on land and in the water. And a scientific formula adds up an interesting issue: the wind pressure on the sail multiplies by the square of the increase in wind speed.

This means that if winds steps up from five to ten knots, the pressure on the sail multiplies four times. As a result, lift is created, pulling your windsurf board forward and sideways.

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