Flytec – Flytec 4030 * User Manual

Page 20

Setting a GPS NMEA 183 interface

Baud rate:

4,800 baud

Interface:

Input no, output yes
- Garmin: NEMA 183 version 1.5
- Magellan: NMEA 183b

For the final approach computer, a destination co-ordinate must be entered and activated
with the GOTO or ROUTE function.

Normal flight according to MacCready

Theory:

Introduction

In order to reach the highest possible cruising speed, the pilot must fly according to MacCrea-
dy for cruise-optimized desired flight. Assuming that the pilot crosses a valley and expects a
thermal with a climb rate of 2 m/s on the other side, he must select his cruising speed so that
the bar of the MacCready display appears at 2 m/s during the glide phase.
If the bar only displays 1 m/s, he is flying too slowly and wasting precious time. If the pilot now
notices that - at the speed selected - he is coming too close to the ground, he must fly more
slowly. In an extreme case, at the speed for the best glide (that is to say with a MacCready dis-
play of 0 m/s), but never more slowly, as otherwise precious altitude is wasted!

Abbreviations

Glide ratio

Emax:

Maximum glide ratio attainable

VH:

Horizontal speed (relative to the air: true airspeed)

VVE:

Own descent

VVL:

Vertical velocity of the air

VFM:

Speed displayed by the airspeed indicator

VW:

Wind speed

VSi:

Total descent (VVE + VVL)

VSt:

Effective rate of ascent in the thermal

VR:

Cruising speed

The polar and its interpretation

In still air, the polar states the vertical speed of descent V

belonging to the specific horizon-

tal speed V

of a craft. V

is a negative value as it represents a downward movement. In the

illustration: polar with and without a head wind

(Polar with head wind: shaded co-ordinate

system)

shows an example of a polar.

Flytec

Operating Instructions FLYTEC 4030