Why does a tube of shuttles have a number on the end, and does it matter which one your club buys? It comes up most weeks, usually in November, when the same shuttles that behaved perfectly in September suddenly start flying out the back of the court. Here are the questions we get asked, in the order people usually ask them.
What does the number actually mean?
It is a speed rating, and speed here means distance. A higher number flies further for the same hit. The common numbers you will see on feather tubes are 76, 77 and 78, sometimes labelled slow, medium and fast alongside the figure. The difference between them is small, a matter of grams in the cork base and construction of the skirt, but on a full-length clear it is very obvious.
It is not a quality rating. A 78 is not a better shuttle than a 76. They are the same shuttle set up to fly different distances, and buying the wrong one for your hall will make good shuttles feel broken.
Why would one hall need a different number to another?
Because a shuttle is decelerated by the air it travels through, and air is not the same everywhere. Three things change it.
- Temperature. Warm air is less dense, so it slows the shuttle less, so the shuttle flies further. A hot hall makes every shuttle faster.
- Altitude. Higher above sea level means thinner air and longer flight. Relevant if you play somewhere genuinely high up, and the reason some clubs abroad use numbers you rarely see in the UK.
- Humidity. Damp air affects the feathers themselves as much as the flight, and a humid hall generally plays a little slower.
Air conditioning, heating and even a full crowd will shift a hall over the course of an evening. This is normal, and it is why clubs keep more than one number in the cupboard.
So which number for a cold hall, and which for a hot one?
The rule reads backwards until you say it out loud: hot hall, slower shuttle; cold hall, faster shuttle. You are using the shuttle to cancel out what the air is doing.
- Cold hall, unheated sports centre in January: the faster number, typically 78.
- Ordinary heated hall, most of the UK, most of the year: the middle number, typically 77.
- Hot hall, summer evening or a well-heated venue: the slower number, typically 76.
Most UK clubs run 77 as their standard and keep a few tubes of 78 for the depths of winter. If you are ordering for a season from the shuttlecock range, that split is a sensible starting point, and your own hall test will refine it.
How do I test a shuttle in my own hall?
There is a standard test and it takes two minutes. A player stands behind one back boundary line and hits the shuttle with a full underarm stroke, aiming upwards at an angle and travelling parallel with the sidelines. A correct-speed shuttle lands in a defined zone just short of the opposite back boundary line.
The principle is what matters: a shuttle of the right speed should come down slightly inside the far back line, not beyond it and not well short of it. The exact width of that landing zone is set out in the Laws of Badminton, so check the current wording with your club, league or coach rather than taking a figure from a blog. Do the test with a decent player rather than the nearest available person, and do it with the hall as it will be during play, doors closed and heating on.
What if the shuttles I have are slightly wrong?
Clubs have fudged this for decades and the fudge is legitimate for casual play. Gently bending the feather tips outwards increases the effective diameter of the skirt, adds drag, and slows the shuttle down. Pinching them inwards does the reverse. It is a small adjustment, not a rescue, and it will not turn a 78 into a 76.
For anything competitive, use the right number rather than adjusting. In a match your opponent is entitled to shuttles that behave predictably, and a tube of hand-tweaked feathers will not.
Do synthetic shuttles have speeds too?
They do, and they are usually indicated by a colour band on the tube or the cork rather than a number. The common convention is green for slow, blue for medium and red for fast, but this is a manufacturer convention rather than a rule, so read the tube rather than trusting the colour alone. When you are comparing nylon shuttles across brands, check what each band actually corresponds to before assuming they match.
Does the number change how a shuttle feels to hit?
Barely. The weight difference between the numbers is tiny and you will not feel it on the strings. What you will feel is the outcome: with a shuttle that is too fast for the hall, your normal clear sails long and you start shortening your swing to compensate, which quietly wrecks your technique over a few weeks. With one that is too slow, you have to hit harder than usual to reach the back line and your arm knows about it by the end of the night.
That is the real cost of the wrong number. It is not that the rallies are worse. It is that you adapt to the shuttle, and then the adaptation follows you into your next match.
What should our club actually buy?
Standardise. Pick one number as your default based on a proper hall test, buy that in quantity, and keep a smaller stock of the next number up for cold months. Write on the cupboard which is which, because someone will open the wrong box otherwise. Ask your league which speed is used for home matches so your training and your fixtures match.
If you are running juniors on nylon and adults on feather, expect to need different numbers for each, and do not assume the two are interchangeable. Beyond that, spend the difference on the shuttles rather than on anything else. A good shuttle of the right speed improves a club night more than almost anything else you can buy, including the rest of the badminton accessories people usually reach for first.