ADI by TruTrak Autopilots
The patent for ADI was received in
near record time. It was not challenged by the patent office due to its
unique design
|
ADI
Bank angle
is instantaneous gyro data
Pitch
is gyro enhanced vertical speed
Direction
is an electronic DG showing track
Basic ADI *$1095
options
backup battery $100
Built-in GPS $150
* internal lighting is
standard on all ADI and
ADI pilot |
|
ADI PILOT
Combines the ADI
with the functionality of the ever popular
Pictorial Pilot and
Altrak, all in one package.
ADI Pilot I*
$ 2795
Roll axis autopilot
Built-in digital DG
GPS Nav mode
Digital track selector
ADI Pilot II*
$ 3995
Pitch and Roll axis autopilot
same features as ADI I
plus
Altitude hold
Altitude adjust for baro change |
|
|
OPERATION
The artificial horizon, when needed is without a
doubt, the most important instrument in the panel. For this reason, the
display must be easy to fly and the instrument very reliable. To achieve
this, the ADI combines modern solid state technology with an easy to see
uncluttered mechanical display. In the basic instrument flight panel it is
intended for installation between an airspeed indicator and an altimeter. It
is also well suited as the conventional backup in panels incorporating one of
the large glass displays.
The ADI is easy to fly partly because it contains in one instrument, roll,
pitch, and direction. Beyond this, it is the content of each of these
displays that make this instrument easy to fly. The direction display is
located in the centre of the instrument just below the rotating horizon mask.
As is often the case with an inexperienced pilot caught in IMC, the
instrument may be viewed with tunnel vision. For this reason it is good to
have the direction in the center of the tunnel. Of more importance is that
this display is track instead of magnetic heading in that the modern way to
navigate is to fly track. When track is presented as a gyro display, the
numbers move sequentially one degree at a time. Experience is showing that
direction control with this digital DG placed immediately below the horizon
mask is as easy to fly as the conventional vertical card DG in combination
with the conventional horizon placed near by.
The bank angle display is driven in a manner similar to that used in the
pictorial turn and bank. The only difference is that in this instrument the
display shows bank angle instead of turn rate. The advantage of this is that
the presentation is instantaneous data only. It cannot drift to accumulate
error as is possible with the more complex AHRS driven systems. It shows bank
angles of up to +/- 45° while the requirement on conventional gyro horizons
is +/- 100°. To compensate for this, flashing red arrows point in the
direction the stick is to be moved to level the aircraft when the bank
exceeds +/- 30°. Note that when flying on instruments the object is to stay
level or at least in shallow banks. This instrument is therefore designed to
keep the pilot out of trouble.
The pitch display is perhaps the most beneficial feature of the ADI when
compared with conventional horizon indicators. For short term or immediate
movement of the nose up or down, this instrument responds and is flown like
any other gyroscopic pitch indicator. The difference is that after the
display has moved in response to an attitude change the deflection is
sustained by the resulting vertical speed. As compared to a pitch attitude
display, the vertical speed display makes it easier to hold altitude and to
maintain stable climbs and descents.
Also, the movable airplane symbol does not have to be adjusted to compensate
for the angle the fuselage flies when vertical speed is zero. It is
recognized that an aircraft when at the limit of its altitude capability can
fly at an ever increasing angle of attack when vertical speed indicates zero.
For this reason an airspeed warning in the form of the letters “A-S” flashing
in the DG display is provided. The answer to this situation is then to
observe the airspeed indicator. For stall prevention airspeed is the best
information short of an angle of attack indicator.
(Better than attitude)
Another plus regarding this display is that when the airplane is going
straight or not turning a wing level presentation is shown. With this
presentation one can disregard the effect of the rudder being out of trim
(ball off centre) just as crosswind is not a factor when flying GPS track for
direction. This is easier than trying to fly straight with the display
showing a wing down as is the case with a conventional horizon display when
the rudder is out of trim. To sum it up, all of the features described above,
in combination, provide what we believe to be the easiest to fly artificial
horizon.
|