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Microsoft Word document - Robert Ramey Software Development

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Microsoft Word document - Robert Ramey Software Development

    Owner’s Manual 830 Cathedral Vista Lane Santa Barbara, CA 93110

    (805)569-3793

    www.rrsd.com

    Introduction .................................................................................1 Basic Operation ..........................................................................2 Sound .........................................................................................3 Graph Display Selection ..............................................................4 Basic Displays ........................................................................4

    Altitude vs. Time 4

    Temperature 4

    Lapse Rate 4 Airspeed .................................................................................5

    Glide Path 5

    Airspeed 5

    Wind Velocity 6 Global Positioning System ......................................................6

    Travel Path 6

    Groundspeed 7

    Wind Vector 7 Using Radio Buttons to Facilitate Display Navigation ...............8 Calibration and Configuration .................................................... 10 Alarms .................................................................................. 11

    Select Alarm 11

    Sound Selection 11

    Alarm Threshold 12

    Notes on alarms 12

    Select Aircraft 14 Pitot Tube Installation ................................................................ 15 GPS Connection ....................................................................... 15

    RS-232 Serial Connection 17

    OEM Interface 18

    Troubleshooting Serial Connections 18 Frequently Asked Questions ..................................................... 19 History ...................................................................................... 22

    GameBoy? is a registered trademark of Nintendo Corporation

    FlyBoy? is a trademark of Robert Ramey Flight Instruments

The Flyboy? vario is a flight instrument for hang glider and paraglider

    pilots. It is packaged as cartridge compatible with a Nintendo

    GameBoy? game player. It can be inserted into almost any

    GameBoy? to create a full featured flight instrument.

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    GPS

    Pitot Tube

    Graph/Display Vario

    Joy Pad

    Start

    Select off/on Altitude

    With power off, insert the FlyBoy? vario cartridge as you would

    any GameBoy? game. Attach the nylon pitot tube and orient it in

    the desired direction. Turn on the power. The FlyBoy? starts with

    a calibration phase which lasts about 30 seconds. During this

    time one should keep the instrument sheltered from windy

conditions. After about 30 seconds, the display should look like

    this.

? Vario a “sliding” scale indicating climb/sink rate in either 100’s

    of feet per minute or meters per second. When the instrument is

    turned on this will show 0 at the pointer.

    ? Altitude will show altitude to the nearest foot or meter.

    ? Graph Display will be blank except for a “clock” icon in the lower

    left hand corner and a “creeping” line from the right which will advance at one dot per second. The icon identifies this display as

    altitude vs. time. The line shows relative altitude for the last 128

    seconds at the rate of one dot per meter change.

    The vario is now ready to use.

    Whenever an increase in altitude is detected, the Flyboy? will

    emit a beeping sound through the GameBoy? speaker or

    headphones. As climb rate increases, the beeps will increase in

    frequency and pitch. When sink rate is below 600 feet per minute,

    an AAAOOGA sound is emitted. The volume can be adjusted by

    means of the volume control on the GameBoy?. If this volume is

    not sufficient, the best solution is to purchase a booster speaker.

    Search the web for “GameBoy? sound accessories” to find one

    appropriate to your GameBoy?.

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    All FlyBoy? varios include the following three basic displays. One can navigate between the displays using the left/right buttons of the GameBoy joypad.

     Temperature Altitude vs Time Lapse Rate

    Each vertical dot represents one meter of altitude change. Each horizontal dot represents one second. The graph is 128 dots wide so this graph shows the climb and sink for the last 128 seconds. A 45 degree slope will correspond to 1 meter per second (180 feet per minute).

    Current temperature in degrees Fahrenheit or Celsius. Temperature vs. Altitude. Each vertical dot represents 10 meters of altitude and each horizontal dot represents 1/16 degree Celsius. Since the graph is 96 dots high, this shows the temperature for the 960 meters (3168 feet) around the current altitude.

    4

    If the pitot tube is installed and airspeed sensing is enabled, the following displays are also available. One can navigate to between this group and the basic one with the up/down joypad buttons

    Wind Velocity Airspeed Glide Path

    This is similar to the Altitude vs. Time graph above. The difference is that each dot on the horizontal axis represents 10 meters (33 feet) travel through the air at the current airspeed. So the slope of the line will represent the current glide ratio and, by implication, current Lift/Drag ratio of the glider. Using this display, the pitch of the glider can be adjusted to maximize the glide ratio. Note that the vertical scale is 1 meter per dot while the horizontal scale is 10 meters per dot. So a glider with a glide ratio of 10 to 1 will show 45 degree angle on this display. Also note that this display will vary in lift and sink and be can be used to maximize glide in these conditions. However, wind direction is NOT taken into account. So if there is significant head or tail wind, the glide ratio shown in this display will be significantly different than glide over the ground.

    The FlyBoy? measures dynamic air pressure with a Pitot tube. This measurement is used to calculate the true airspeed. This calculation takes into consideration that fact that a glider “floats” upon a “cushion” of higher pressure air under the wing. Once the glider is no longer flying, this number is no longer valid. Hence, on

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    the ground before launching, this display should show a number which approximates the stall speed of the glider. Below, we explain how to set the glider stall speed in the FlyBoy?. Current wind velocity in either miles or kilometers per hour. Note that this is a very accurate measure of wind velocity. This can be verified by walking with the instrument indoors and reading your airspeed. It can be handy for checking wind direction before launching. It differs from Airspeed above, in that there is no adjustment made for the fact that the glider induces a change static pressure under its wing. It is not useful when the glider is in flight.

    If a GPS unit has been connected to the FlyBoy? and GPS option has been enabled, the following group of displays is available. One navigates

    Groundspeed Wind Vector Travel Path

    This is the true glide path over the ground. It is differs from the glide path in that the horizontal distance is taken from the GPS input. Adjusting glider pitch to “flatten” the slope of this line will

    maximize distance traveled over the ground for the current air conditions. That is, Lift/Sink as well as Tail/Head wind will be taken into account. The path traced by the graph is the path the glider follows as would be seen by and observer from the ground.

    6

Speed and compass heading over the ground as determined by

    the GPS.

    Given input from the Pitot tube and GPS while the glider travels at

    various headings, it is possible to determine the wind velocity and

    heading. This display shows the heading and velocity of the

    glider in relation to the glider. That is, it provides a “virtual windsock”. The display shows two icons. One represents the glider while the other represents the source of the wind in relation

    to the glider. On the above diagram

    ? Source of wind is at about the 10 o’clock position relative

    to the glider heading.

    ? Wind is fairly strong. The display shows are larger

    distance between the source of the wind and the glider

    icon. If there were a light wind the glider and wind source

    icons would be much closer together as is shown here

    ? Wind direction and strength are fairly well defined. This is

    shown by the relatively small “error ellipse” showing the

    wind source. In a gustier wind whose direction and

    strength are unstable, the above display would look more

    like the following:

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The error ellipse gives an indication of the uncertainty of the

    estimate of wind direction and velocity.

    This uncertainty might be due to

    ? If the glider heading has not changed in a while, there is

    not enough information to precisely calculate the wind

    direction and velocity. In this case, making a 360 degree

    turn should result in a display with a smaller error ellipse.

    ? If wind conditions are unstable, any estimate of the “true”

    wind direction and velocity is going to be of limited value.

    In this case, there is a limit to how precise the estimate

    can be. This will result in an error ellipse whose size

    cannot be decreased by making a 360 degree turn. So this display gives a concise and meaningful description of

    wind conditions. This can be very useful when setting up for

    landing where there aren’t other obvious wind indicators and for

    flying cross country at high altitude.

    So far we’ve described three groups of displays of three displays

    each. One can navigate from group to group via the up/down

    buttons on the joypad. The small icon on the lower left of the

    graph display indicates which group is currently selected. Within

    a group one can change displays via the left/right buttons on the

    joypad. That is, the displays are arranged as a three by three

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