How air density, court temperature (°C / °F), elevation and humidity change feather shuttlecocklanding distance—and how to specify the exact speed code for your market.
Reviewed by Shuttlecock Supplier Technical & QC Desk · Anhui & Zhejiang Supply Chain · Last updated October 31, 2026 · BWF Standard Reference
| Metric Speed Code | Approximate Weight / Grain Equivalent | Hall Temperature (°C / °F) | Elevation / Air Density | Primary Regional Markets & Season |
|---|---|---|---|---|
| Speed 75 (Slowest) | ~4.74 – 4.85 g (Grain 73–74) | > 28 °C (> 82 °F) | High altitude (> 1,200 m / 4,000 ft) or hot tropical halls | High-altitude cities (e.g. Denver, Mexico City, Kunming) & peak equatorial heat |
| Speed 76 (Medium-Slow) | ~4.85 – 4.98 g (Grain 75–76) | 22 – 28 °C (72 – 82 °F) | Low-to-mid elevation (300 – 1,000 m) or warm humid air | Southeast Asia (Malaysia, Singapore, Indonesia, Thailand), US South summer, South China |
| Speed 77 (Standard) | ~4.98 – 5.12 g (Grain 77) | 16 – 22 °C (61 – 72 °F) | Sea level to 300 m temperate indoor halls | US East/West Coast, Continental Europe, Australia, Japan/Korea spring & autumn |
| Speed 78 (Medium-Fast) | ~5.12 – 5.28 g (Grain 78–79) | 10 – 15 °C (50 – 59 °F) | Sea level cool dense air | United Kingdom, Northern Europe, Canada & US Northeast/Midwest winter halls |
| Speed 79 (Fastest) | ~5.28 – 5.50 g (Grain 80+) | < 10 °C (< 50 °F) | Sea level cold unheated sports halls | Unheated winter gymnasiums requiring heavier cork momentum |
Warm air and high-altitude air are less dense, offering less aerodynamic drag against the 16-feather skirt. A Speed 77 shuttlecock tested at 18 °C at sea level will fly 30–50 cm further—often sailing past the back doubles service line—when played in a 27 °C tropical hall or at 800 metres elevation. Choosing Speed 76 compensates for thinner air so the shuttle lands squarely inside the BWF test zone.
Under BWF Law 4.4, a player strikes the shuttlecock with a full underhand stroke from the back boundary line, making contact above the back line and parallel to the sidelines. A correctly matched shuttlecock lands between 530 mm and 990 mm short of the opposite back boundary line (inside the two doubles long-service test marks). Always test 3 shuttles per sample tube after acclimating the tube in your hall for 24 hours.
Importers and clubs in four-season regions (such as North America, Europe and East Asia) frequently split a 10-carton (500-tube) order into 60% Speed 77 (spring/summer/autumn) and 40% Speed 78 (winter). We label each tube end-cap and master carton clearly by speed code so warehouse sorting is immediate.
Direct engineering and procurement answers for international buyers.
Speed 76 is slightly lighter (~0.10–0.15 g less) or calibrated with a slightly wider skirt drag angle than Speed 77 so that it travels 25–40 cm shorter. Use Speed 76 in warm indoor halls (22–28 °C / 72–82 °F) and Speed 77 in standard temperate halls (16–22 °C / 61–72 °F).
Yes. You can specify different speed codes per carton (50 tubes per master carton) or request mixed-speed sample tubes to test in your facility before confirming your bulk speed breakdown.
Chinese and Asian manufacturers use metric speed numbers 75, 76, 77, 78 and 79, where each step represents approximately 0.12–0.15 grams of weight/flight calibration. Speed 76 corresponds to warm-hall medium-slow, Speed 77 to international standard, and Speed 78 to cool-hall medium-fast.
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