Blaze ASI-5 User manual
Introduction
The ASI-5 is a 3 1/8” (80mm) sunlight readable instrument that pro ides a wide range airspeed indication in both digital
and analog tape formats. Airspeed is based on the pressure generated by a pitot tube system and a static port is pro ided
as well for use by high speed aircraft. In addition, the ASI-5 pro ides a flight timer since takeoff and records the maximum
airspeed reached.
Airspeed can be indicated in statute miles per hour (mph), kilometers per hour (km/h) or nautical miles per hour (kts). The
analog airspeed tape can be scaled according to the aircraft’s flying speed range and ranges for Vs0, Vs1, Vfe, Vno and
Vne can be set. The ASI-5 also pro ides a programmable Vs and Vne airspeed alarm output. ASI sensiti ity can be
calibrated by the user to cater for errors caused by pitot tube placement.
The ASI-5 can measure airspeed from 20mph to 250mph (Version 1), 20mph to 350mph (Version 2) and 20mph to
320mph for the ASI-5HS (High Speed ersion). All are well suited to slower aircraft due to ery good sensiti ity and
linearity at low air speeds.
Please note that the ASI-5 Version 2 replaces both the ASI-5 Version 1 and the ASI-5HS (High speed) unit.
Bla e ASI-5
Airspeed Indicator (ASI)
Operating Manual – English 1.06
Bla e ASI-5 Operating Manual Page 2
1 Features
•Large 2.6” high resolution 320x240, IPS (fully viewa le in all directions), sunlight reada le color LCD
display
• The ASI-5 measures airspeed from 20mph to 250mph (Version 1)
• The ASI-5 measures airspeed from 20mph to 350mph (Version 2)
• The ASI-5HS (High Speed version) measures airspeed from 20mph to 320mph
• Both units are well suited to slow aircraft due to very good sensitivity and linearity at low air speeds
• Includes a flight timer since takeoff
• Airspeed units can be set to miles per hour (mph), kilometer per hour (km/h) or nautical miles per hour
(kts)
• Analog tape with programmable ranges for Vs0, Vs1, Vfe, Vno and Vne
• Contains a programmable Vs and Vne airspeed alarm output
• Records maximum airspeed reached in permanent memory
• Includes a RS232 serial output for interfacing to external equipment e.g dataloggers etc.
• Standard 3 1/8” aircraft enclosure (can be front or rear mounted)
• The LED backlight can automatically adjust to the ambient light, or it can be manually adjusted in the
menu system
• Rotary control plus 2 independent buttons for easy menu navigation and user input
• Wide input supply voltage range of 8 to 30V DC with built in voltage reversal and over voltage protection
for harsh electrical environments
• 1 year limited warranty
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2 Layout
3 Main Display
The ASI-5 has 2 different display screens. The main display screen can be selected in the “ASI SETUP” menu.
3.1 Airspeed "TAPE" Display
F2 / Down Button:
Menu system: Softkey button
Sunlight readable color graphic display:
The backlight can automatically adjust
to the ambient light or it can be manually
adjusted in the menu system
Rotary Control (Up/Down) & Enter Button:
Press the rotary control during the normal display screens to access the menu system. Rotate anti/clockwise for
up/down menu scrolling. Rotate the rotary control during the normal display mode to iew the Max Values display.
F1 / Up Button:
Menu system: Softkey button
Normal Display: Start / Stop the
flight timer (Manual flight only)
3 1/8” (80mm) enclosure.
Can be front or rear mounted
Airspeed unit
Digital airspeed
Airspeed tape
Duration of flight since takeoff
Vs0 (Min safe speed, landing)
Vs1 (Min safe speed, normal)
Vfe (Max flap speed)
Vno (Max maneu ering speed)
Vne (Max exceed speed)
Ambient light sensor
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3.2 Airspeed "DIAL" Display
3.3 Maximum Airspeed display
This display can be accessed by rotating the rotary control during the normal display
mode. Press the F1/Up button when the max alues display is showing to reset the
maximum alues to the current airspeed.
3.4 Start / Stop flight display
Press the F1/Up button during the normal display mode
to manually start/stop a flight. This key is only acti e if
the ASI-5 is setup to select the manual flight option
under the “TIMERS” setup menu.
Note: The maximum airspeed is stored in non-volatile
memory and is recalled on power-up.
Duration of flight since takeoff
Digital airspeed
Airspeed unit
Analog airspeed dial
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4 Menu System
Press the rotary control button during the normal display mode to enter the menu system. Use the rotary control to
na igate through the menu system.
4.1 Exiting the menu system
Press the F1/Up button to exit the menu system when the “EXIT” soft key is shown. All changes made during na igation
of the menu system will be sa ed in non- olatile memory upon exiting. The instrument will not sa e any changes if you
remo e power before exiting the menu system.
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4.2 Flight Timer
View Flight Log:
Use the rotary control to iew the next flight log entry.
Erase Flight Log:
Use this function to erase the flight log stored in the ASI-5.
FLIGHT:
Select whether you want the ASI-5 to automatically detect a flight or whether the pilot must press the F1/Up button to
start/stop a flight. We recommend you select automatic flight detection.
T/O AIRSPEED:
This menu option is only shown if the “DETECT” flight mode is selected. Enter the takeoff airspeed threshold that you
want the flight timer to start incrementing.
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4.3 ASI Setup (Airspeed Setup)
Zero ASI Sensor:
This setup allows your instrument to measure the zero airspeed reading of the airspeed sensor and set a calibration alue
internally for this. This is equi alent to some mechanical airspeed indicators that ha e an adjustment to set the needle to
zero when the aircraft is not mo ing. You would use this function occasionally if you see an airspeed reading when the
aircraft is at rest. This may be caused by aging of the built in pressure sensor or related electronics. When this function is
performed make sure that there is no air flow into the pitot tube as this would result in an incorrect internal calibration.
Style:
Select the airspeed display screen. Options include "DIAL" or "TAPE".
ASI nit:
Select if you want the airspeed to be displayed in mph (statute miles per hour), km/h (kilometers per hour) or kts (nautical
miles per hour).
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ASI Filter:
This function can be used to select the signal filter time constant. Selections are "NONE", “FAST” or “SLOW”. This
selection influences the rate at which your ASI can change its reading. If you ha e an installation that suffers from strong
turbulence at the pitot tube, select “slow”. If you ha e a ery clean airflow in front of the pilot tube you can select “fast”
which will gi e you a faster response to airspeed changes.
ASI Span:
Select the maximum airspeed that you want the airspeed tape to display. This can gi e you increased display resolution.
ASI In View:
Adjust this setting to set the amount of tape to iew. For example, setting this alue to 30% and your "ASI SPAN" to 250
will result in the tape showing 75 on the display at a time.
Vne Speed: (Max Exceed Speed)
Enter you maximum speed you aircraft should not exceed.
Vno Speed: (Max Maneuvering Speed)
Enter your maximum maneu ering speed.
Vfe Speed: (Max Flap Speed)
Enter the maximum speed that is permissible with the flaps extended.
Vs1 Speed: (Min Safe Speed, Normal)
Enter your minimum safe speed for normal flight of your aircraft
Vs0 Speed: (Min Safe Speed, Landing)
Enter your minimum safe speed for landing your aircraft
Vs Alarm:
This enables or disables Vs Alarm.
Vne Alarm:
This enables or disables the VNE alarm.
Cal:
During the factory calibration a factor has been determined and entered here that will gi e you accurate airspeed,
pro ided your pitot tube is not influenced by pressure effects caused by airflow around your airframe. The calibration is
displayed in % of the reading, you can increase or decrease the reading if required to help cancel out under or o er
reading of the airspeed indicator on your aircraft.
Vs0 (Min safe speed, landing)
Vs1 (Min safe speed, normal)
Vfe (Max flap speed)
Vno (Max maneu ering speed)
Vne (Max exceed speed)
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4.4 COMM Setup (Communication Setup)
Serial Out:
Select “ON” to enable the RS232 serial output.
nit Address:
Enter the unit address.
Baud Rate:
Select the desired baud rate of the serial output.
4.4.1 Protocol Format
STX, Address, Message type, Length, Data payload, Checksum, ETX
STX: Start of text (0x02)
Address: unsigned char (8bit), Unit address (range 0-255)
Message Type: unsigned char (8bit), Specifies the message type
Length: unsigned char (8bit), Length of the data payload (does not include the STX, Address, message type, checksum or
ETX)
Data payload: Data
Checksum: unsigned char (8bit), XOR of all bytes starting from the unit address to the end of the data payload. The
checksum is seeded with 0xa5. (does not include the STX or ETX)
ETX: End of text (0x03)
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4.4.2 Data payload
Message type=7
Data Length=2 bytes
Output Rate=1Hz
Airspeed: Unsigned Int (16 bit), Airspeed in mph
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