IMG_9469ศาสตราจารย์ Bert Blocken นักวิทยาศาสตร์ชาว Dutch ผู้คิดค้นการทดสอบผ่านอุโมงค์ลม พบว่าในขณะที่นักปั่นที่อยู่ด้านหลังจะได้รับผลประโยชน์จากแรงลมดูด สามารถช่วยลดแรงต้านลมให้กับนักปั่นที่อยู่ทางด้านหน้าได้อีกด้วย โดยผ่านปรากฏการณ์ที่เรียกว่า Subsonic Upstream Disturbance กล่าวคือ เมื่อนักปั่นที่ปั่นตามหลังห่างจากคุณ 15 cm. ที่ความเร็ว 54 kph (ประมาณ 33.5 mph.) จะช่วยลดแรงต้านในการลากไปถึง 2.5% นั่นหมายความว่า ยิ่งใกล้ก็ยิ่งดี โดยในขณะที่ถ้าระยะห่าง 1 เมตร จะลดแรงต้านลงเพียง 0.6% เท่านั้น

สำหรับการฝึกสปริ้นท์ในระยะทางยาวๆ หรือทีมปั่นประเภท time trial ตำแหน่งที่ได้รับการปกป้องจากแรงลมดีที่สุดคือลําดับที่ 2 ไปจนถึงคนสุดท้าย ยิ่งไปกว่านั้นการที่มีสมาชิกในทีมเพิ่มขึ้นจะช่วยเพิ่มระยะระหว่างคุณกับคู่ต่อสู้ที่คุณต้องการจะเอาชนะอีกด้วย

แต่อย่างไรก็ดีครับ การปั่นให้สนุกสนานและมีมารยาทคือการมอบนํ้าใจให้แก่กัน หมั่นผลัดวนกันขึ้นมาลากแม้จะไม่มีกิโลฯ แต่ก็ช่วยให้หัวลากได้พักขากันบ้างนะครับ นอกจากเป็นการแสดงนํ้าใจแล้วยังฝึกความแข็งแรงของตัวคุณเองอีกด้วย อย่าเคยตัวเอาแต่ดูดกันอย่างเดียวนะครับ

Professor Bert Blocken, a Dutch scientist, discovered through test in the wind tunnel that while a rider benefits from being in a slipstream, having a hanger-on can actually reduce air resistance for the rider in front of them through a phenomenon known as ‘subsonic upstream disturbance’. When the rider is 15cm. behind you at 54 kph (approximately 33.5mph) that reduction in drag is 2.5 per cent. The closer the better ; when the rider drops back to 1m, the reduction is 0.6 per cent.

For a long sprint train, or a team time trial, the most protected position is in fact second to last. What’s more, an extra teammate means you can put some intermediate distance between you and your rival should you choose to attack.

Categories: Cycling Tips

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