Disc golf flight numbers explained: Speed, glide, turn and fade

In short: Disc golf flight numbers are four ratings printed on a disc, in the order speed, glide, turn and fade, like 7 · 5 · −2 · 1. Speed and glide are about how far it can go and how hard you need to throw it. Turn and fade are about which way it bends, first right and then left for a right-hand backhand.

Take that 7 · 5 · −2 · 1. Speed 7 means it needs a medium-fast throw, glide 5 that it holds up well, turn −2 that it drifts right while it’s fast, and fade 1 that it finishes with only a soft hook left. All four assume a throw fast and clean enough for the disc, so a slower throw gets less of the turn and an earlier fade than the numbers say.

So the numbers on the disc in your hand are the same for everyone, and what they do for you isn’t. Digo, an iPhone app launching soon, lets you talk that gap through. Name the one you’re holding, describe what your throws usually do, and it can say what those four numbers mean for you, going by what you’ve told it.

This guide takes the four numbers one at a time, each with a drawn path where only that number changes, then puts them back together on real discs. Everything here is for a right-hand backhand. Left-hand backhand and right-hand forehand fly the mirror image, covered at the end.

What are the four flight numbers?

The answer: Speed, glide, turn and fade, always in that order.

The scale is Innova’s (explained on its site), and many other makers use a similar one, each rating its own discs.

Number	Range	What it tells you
Speed	1 to 14	How fast the disc needs to be thrown to fly as rated
Glide	1 to 7	How well it holds itself up in the air
Turn	+1 to −5	How much it drifts right while it’s still fast
Fade	0 to 5	How hard it hooks left as it slows down

The first two are about distance and effort. The last two are about the shape of the flight. Speed, the first one, is the easiest to misread.

Speed: How fast the disc needs to be thrown

The answer: Speed is the pace a disc is built to fly at, which in practice means how fast you have to throw it for it to fly the way its other three numbers say.

A higher speed number usually goes with a wider rim and a sharper edge, built to cut through the air. Thrown hard enough, that shape carries farther. Thrown too softly, it doesn’t get going, and the disc drops out of the air and hooks left early.

Speed also sorts discs into kinds: Putters 1 to 3, midranges 4 to 6, fairway drivers 6 to 9 and distance drivers 10 and up. The types of disc golf discs guide shows one of each.

Illustrative pathsRight-hand backhand

1. 1Speed 4 (example)45−11
2. 2Speed 8 (example)85−11
3. 3Speed 12 (example)125−11

That last point in the caption is the catch. The drawing hands every disc the arm speed it asks for. On a real throw you only get the distance if you supply the speed.

Glide: How long the disc stays up

The answer: Glide is how well a disc holds itself up in the air. More glide keeps it flying longer on the same throw.

High glide is a friend to a slower throw, because the disc keeps carrying after the push runs out. Low glide brings the disc down sooner, which can be what you want on a short hole with trouble behind the basket.

Illustrative pathsRight-hand backhand

1. 1Glide 3 (example)73−11
2. 2Glide 5 (example)75−11
3. 3Glide 7 (example)77−11

Two real fairway drivers far apart on the glide scale: The River, with a lot of glide, and the Firebird, with very little.

Turn and fade: Which way the disc bends

The answer: Turn is what the disc does while it’s fast, early in the flight. Fade is what it does as it slows down at the end.

Turn runs from +1 to −5. The more negative it is, the farther right the disc drifts, and the less it comes back. A turn of 0 or +1 means it doesn’t drift right at all.

Illustrative pathsRight-hand backhand

1. 1Turn 0 (example)7502
2. 2Turn −2 (example)75−22
3. 3Turn −4 (example)75−42

Fade runs from 0 to 5. A fade of 0 lands close to where it was heading. A fade of 4 or 5 hooks hard left at the end, whatever happened before.

Illustrative pathsRight-hand backhand

1. 1Fade 0 (example)75−10
2. 2Fade 2 (example)75−12
3. 3Fade 4 (example)75−14

Read together, turn and fade describe how stable a disc is. That has its own guide on understable and overstable discs, with how wind and arm speed move it.

How to read the four numbers as one line

The answer: Read them left to right as the story of one flight. How hard to throw it, how long it stays up, what it does while it’s fast, and how it finishes.

Back to 7 · 5 · −2 · 1. That’s the Leopard3: A fairway driver that needs a medium-fast throw, holds up well, drifts right in the middle and barely comes back left. Put next to four other discs, the numbers turn into lines you can compare:

Illustrative pathsRight-hand backhand

1. 1ZoneDiscraft4303
2. 2BuzzzDiscraft54−11
3. 3Leopard3Innova75−21
4. 4HeatDiscraft96−31
5. 5WraithInnova115−13

A few things to read off them:

• The Zone is slow, with little glide, no turn and a firm fade. It goes where you point it and then drops left, which is why players use it for short approach shots.
• The Buzzz is a midrange with a little turn and a little fade, so the two nearly cancel out and it flies close to straight.
• The Heat has more speed and glide than the Leopard3 and a turn of −3. It drifts farther right and comes back only a little.
• The Wraith is a distance driver. Speed 11 gives it the longest line, for a throw fast enough to get there, and a fade of 3 a firm finish.

In these diagrams, speed and glide set the length and the last two numbers set the shape. On a real throw, turn and fade change the distance too, as the Wraith and the Leopard3 show below, so treat that as a rough first look at two discs, not a rule.

Why a higher speed number can mean less distance

The answer: A disc only gets the flight its numbers describe when it’s thrown at its speed. Thrown slower, a high-speed disc skips most of its turn, fades early and can land shorter than a slower disc would.

The four numbers are rated for a fast, clean throw: Enough arm speed for that disc, released flat. Very few throws match that every time, and on a slower one every disc acts more like it has less turn and more fade than its label says.

Take the Wraith from the diagram. With a fast arm it’s the longest line on the page. With a slower one, its −1 turn never shows: It flies straight for a moment and then hooks left, and it can land short of where the Leopard3 would. For slower arms a fairway driver with a speed of 6 to 7 and a turn of −1 to −2 can go about as far as a distance driver, because it gets its whole flight. The fairway drivers guide goes through that choice, and the beginner discs guide builds a first set around it.

You can check a disc yourself, as long as it’s one with a turn of −1 or lower. Some discs, like the Zone and the Firebird, are made to pull left early. On an open field, release it flat, with its front edge tipped slightly down. If it still hooks left soon after it leaves your hand, its speed is probably more than your throw gives it right now.

What flight numbers don’t tell you

The answer: How you throw, how the maker rated it compared with other brands, and what has happened to that copy since it left the shop.

• How hard and how cleanly you throw. The numbers assume the right arm speed and a flat release. A disc tilted as it leaves your hand starts by curving toward its low edge, and its turn and fade then add to that or work against it.
• The maker. Each brand rates its own discs. A turn of −2 from one maker isn’t always a turn of −2 from another, so numbers compare best within one brand.
• Wear. A disc that has hit trees and the ground tends to turn more over the years. Players say it’s “beat in”. The number on it stays the same.
• Weight and plastic. A heavier disc of the same mold (the same model, like the Buzzz) usually flies a little more stable, and the same mold in another plastic can fly a little differently. The disc weight guide covers the weight side.
• Wind. A headwind makes a disc turn more, and a tailwind makes it fade sooner.

So the numbers are a hint, not a promise. They’re good for comparing discs and a rough guide to a single one. When an old disc in your bag stops flying like its label, Digo, once it’s out, lets you set its numbers to how it flies now, on the same screen where you set its wear.

Left-handed and forehand throws

The answer: The numbers stay the same, and the flight flips. For a left-hand backhand or a right-hand forehand, turn drifts the disc left and fade hooks it right.

Every diagram above works if you hold it up to a mirror. A forehand adds one twist: The release tends to leave the disc with a small wobble or tilt, which makes it drift more than its turn number says. The understable vs overstable guide draws two discs thrown forehand.

The short version

Speed is how hard a disc needs to be thrown, glide how long it stays up, turn what it does while fast and fade how it finishes. Read the four as one line, then adjust for your own throw: The slower it is compared with the disc’s speed, the less turn and the more fade you’ll see. Pick a speed you can throw, compare discs within a brand, and treat every number as a hint.