Flight Planning & Navigation Flashcards

What is the primary purpose of a glider's flight computer?

Answer: To calculate glide ratios and wind corrections

A glider's flight computer, often called a variometer or flight management system, is primarily used to optimize flight performance. It calculates critical data such as the glider's current glide ratio, provides information on thermal strength, and helps pilots make wind corrections to maximize distance and efficiency during cross-country flights. It does not control radio systems or monitor engine performance, as gliders are engineless.

When planning a cross-country glider flight, what is the most critical factor to consider?

Answer: Availability of enroute landing fields

For cross-country glider flights, the most critical factor is the availability of suitable enroute landing fields. Gliders have no engine, so pilots must always be within gliding distance of a safe landing spot in case thermals dissipate or weather changes. Planning for these 'out-landings' is essential for safety and successful flight completion.

What does the 'glide ratio' of a glider indicate?

Answer: The horizontal distance traveled per unit of altitude lost

The glide ratio (or lift-to-drag ratio) of a glider is a fundamental performance metric. It indicates how many units of horizontal distance the glider can travel for every unit of altitude it loses in still air. A higher glide ratio means the glider can travel further from a given altitude, which is crucial for efficient cross-country soaring.

Which weather phenomenon is most beneficial for sustaining glider flight?

Answer: Thermal updrafts

Thermal updrafts are columns of rising air created by differential heating of the earth's surface, and they are the primary energy source for sustaining glider flight. Glider pilots seek out and circle within these thermals to gain altitude, allowing them to extend their flights and cover long distances without an engine, making them crucial for soaring.

What is the purpose of a 'speed-to-fly' calculation in gliding?

Answer: To calculate the optimal airspeed for best glide ratio

Speed-to-fly calculations are critical for glider pilots to optimize their flight path. This involves determining the optimal airspeed to fly between thermals to achieve the best possible glide ratio, minimizing altitude loss and maximizing distance covered. It helps pilots efficiently transition between areas of lift, conserving energy for longer flights.

When navigating using a sectional chart, what does a blue dashed line typically represent?

Answer: Class D airspace ceiling

On a sectional chart, a blue dashed line typically represents the lateral limits of Class D airspace. The ceiling of this airspace is usually indicated by a number within a box, often followed by a 'T' for 'thousand feet MSL' (Mean Sea Level). This visual cue helps pilots understand airspace boundaries and restrictions, ensuring compliance with air traffic regulations.

What is the significance of the 'best glide speed' for a glider?

Answer: The airspeed that gives maximum distance for altitude lost

This speed provides the maximum distance for altitude lost in still air.

Which instrument is most critical for maintaining proper airspeed during a glider's final approach?

Answer: Airspeed indicator

The airspeed indicator is essential for maintaining proper approach speed.

What is the primary purpose of creating a 'glide angle ring' on a sectional chart during flight planning?

Answer: To visualize all potential landing sites within glide range

This visual aid helps identify reachable landing areas from any position.