## What is the glide ratio of a sailplane?

One measure of performance is the glide ratio. A ratio of 30:1 means that in smooth air a glider can travel forward 30 meters while losing only 1 meter of altitude.

**What is a good glide ratio for a glider?**

It is good to know what your “best” glide ratio is, such as most single engine training airplanes are in the 9:1 glide ratio. Glider certification requires a 7:1 glide ratio, which is close to an 8 degree glideslope.

### How do I calculate my glider range?

A shortcut way to compute glide range in nautical miles for any given glider is to divide the published glide ratio by 6. So, an aircraft with a 24:1 glide ratio will go 4 NM, one with a 54:1 glide ratio will go 9 NM, etc.

**How much is a sailplane?**

New, factory-built sailplanes may cost $50,000 to over $300,000 or more depending on performance, construction, and equipment. Excellent kits for homebuilding are on the market, enabling enthusiasts to produce a sailplane at a cost of one-third to two-thirds that of a factory-built machine.

## How long can a sailplane stay in the air?

Gliders can remain flying as long as there is lift available. Using thermals, this is about 8 hours. By using prevailing winds blowing up a slope, a glider can be flown for as long as the wind is blowing.

**How far can you glide in a glider?**

Modern gliders can have glide ratios better than 60:1. This means they can glide for 60 miles if they start at an altitude of one mile. For comparison, a commercial jetliner might have glide ratios somewhere around 17:1.

### What is a glider ratio?

Glide ratio is the number of feet a glider travels horizontally in still air for every foot of altitude lost. If a glider has a 50:1 glide ratio, then it travels 50 feet for every foot of altitude lost.

**What glide shape is best?**

The best shape for an airplane or glider would look like the ASH-30mi, an open class glider with an 86.9ft wingspan, and a 41:1 aspect ratio (wing length to wing chord). It has a glide ratio exceeding 60:1, and is considered the state of the art for gliders.

## What V speed is best glide?

Other V-speeds

V-speed designator | Description |
---|---|

V BG | Best power-off glide speed – the speed that provides maximum lift-to-drag ratio and thus the greatest gliding distance available. |

V BR | Best range speed – the speed that gives the greatest range for fuel consumed – often identical to Vmd. |

**What does a 9 to 1 glide ratio mean?**

The maximum L/D ratio (L/Dmax) of a Cessna 172 is about 9, so its glide ratio is about 9:1 – for every 9 units traveled forward it will lose 1 unit of altitude. So, it will glide about 9,000 feet for every 1,000 feet of altitude available. This is a fairly typical value for small planes.

### What is the best glide angle?

All aircraft have a given best glide angle. It can be a moderate angle like the Cessna 150 at about 7 degrees, to a steep angle of 15 to 20 degrees for airplanes that don’t glide as well; or it could be extraordinarily shallow, at less than 3 degrees for gliders.