Brantly B2-B/Systems

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Your helicopter is equipped with a high tech. turn coordination system consisting of a short piece of yarn attached with scotch tape to the front of the bubble. The yaw string shows the relationship of the slipstream to the orientation of the helicopter and can be used to help coordinate turns with the pedals during cruise flight. During coordinated cruise flight, the yarn should be oriented vertically. If you have too much or too little left or right pedal, the yaw string will bend to one side or the other. Apply pedal in the direction you want the string to move. For example, if the yaw string is leaning left, you should apply more right pedal to move it back to the vertical position. You will typically need to adjust pedals in response to changes in collective, or during turns. The yaw string should only be used during cruise flight, and should not be relied on during hovering or low speed flight.


When you first wear the HUD it will be dark and "disconnected" will displayed to indicate the HUD has not connected to an aircraft. When you sit in either the pilot (right) or co-pilot (left) seat, the HUD will connect and light up. The HUDs of the pilot and copilot/passenger show identical flight data including control positions. There are three main parts of the HUD: Main Flight Controls, Flight Instruments and Fuel/Engine/Electrical Instruments.

3 Main Flight Controls

The main part of the HUD shows the tail-number and HOBBS time of your aircraft on top, and three boxes with a red dot showing your flight control positions. The flight controls are:

  1. Collective - Collective controls the total thrust the helicopter is producing. Drag the red dot with the mouse to move the collective. You can also use the Up/Down arrow keys. The red dot will show current collective position regardless of which method you use to manipulate it.
  2. Cyclic - Cyclic controls the direction that thrust is directed. Drag the red dot with the mouse to move the cyclic. In cruise flight, turns should be performed primarily with cyclic, with the pedals used for trim.
  3. Anti-Torque - Anti-Torque (pedals) is used to control the tail rotor thrust. Use the mouse in the horizontal bar to set pedal position, or use the Left/Right arrow keys to control anti-torque. The pedals should be used for turns during hovering flight, and for trim using the yaw string or inclinometer while in cruise flight.

4 Flight Instruments

The flight instruments part of the HUD is opened/closed by pressing the "INST" button on the left side of the main HUD. From left-to-right starting on the top row the instruments are:

  1. Fuel Flow - This instrument shows the fuel flow in gallons/hour on the outer arc. The inner green arc can be used for leaning. Once in cruise, the engine can be leaned until the MP matches the value shown on the green arc. Full rich should be used for takeoff and landing.
  2. Manifold Pressure - The manifold pressure is shown in inches of Hg. Manifold pressure is an engine of the power output of the engine.
  3. Engine/Rotor RPM - The long needle marked "E" shows the engine RPM on the outer scale. The short needle marked "R" shows the rotor RPM on the inner scale. The engine RPM should be between 2800 and 3000 RPM for normal flight.
  4. VSI - Vertical speed in feet/minute.
  5. Altitude - Altitude above sea level in feet.
  6. Airspeed - Airspeed in Miles/Hour.

5 Fuel/Engine Instruments

The fuel/engine instruments part of the HUD is opened/closed by pressing the "FUEL" button on the right side of the main HUD. From the top of the HUD these instruments are:

  1. Fuel Quantity
  2. Cylinder head temperature
  3. Oil temperature (top), oil pressure (lower left), fuel pressure (lower right)


The fuel cap is located on the left side of the aircraft behind the passenger door. The fuel cap must be removed before servicing the aircraft. You can use any compatible refueling system (including typing "refuel" in local chat). For more control over your refueling, you can use the "SA AvGas Canister" bundled with this aircraft. Rez the canister within 10m of your aircraft and click on the canister. It will search for nearby aircraft which have had their fuel caps removed and display a list by N-Number. Choose the N-number of the aircraft you wish to fuel. Click the canister again to get a menu of refueling options. Refueling options include: Check - Check the current fuel level. n Gal - Add n gallons (various quantities are listed) to the tank. Fill - Fill tank completely. Done - Exit menu and disconnect from aircraft. While a fuel canister is in use, it cannot be used by anyone else until they have selected "Done", filled the tanks, or a 5 min. timeout has expired. Note that fuel has weight and will affect the performance of your aircraft. One gallon weighs approximately 6 pounds. If carnying a lot weight, it is sometimes useful to fill the tanks only part way.


This aircraft uses a 14V electrical system. The current status of the electrical system is displayed on the top gauge of the HUD. The scale on the left side labeled AMPS shows the current rate of power consumption (or charge), while the right side labeled "VOLTS" shows the current charge on the battery. Both gauges only register when the master switch is on. All electrical devices use power and will drain the battery. The starter and the landing/taxi lights place the highest load on the battery. Below 9 volts, electrical devices including the starter will begin to fail or be less effective. Care must be taken to turn off the master switch after flight or the battery will be dead by the next flight.

An engine driven generator recharges the battery during flight. It is enabled by switching on the Generator switch on the HUD. The amount of power generated depends on engine RPM, and very little power is generated at low RPM levels. For this reason, it is best to turn off non-essential electrical equipment while idling.

A recharging system is provided to recharge the battery and/or perform a jump start if the battery is depleted. To use the recharger, you must first remove the cap on the electrical port located to the left of the passenger seat near the back. You can then rez the "SA Battery Recharger" near the aircraft. Click on the power pack to select and connect to an aircraft. Once connected, it will automatically begin charging. Leave the master switch off in the aircraft while charing to minimize recharge time. A red light on the power pack indicates that the battery is being charged, while a green light indicates that the recharge is complete. An indicator on the power pack shows the current charge on the aircraft battery.


This aircraft is equipped with an on-board ELT (Emergency Locator Transmitter). The ELT is located behind the baggage compartment with a small antenna mounted on the top of the fuselage. Controls for the ELT are on the main console below the Low RPM Warning light. The controls consist of a light that will flash to indicate an ELT alarm has been triggered, and a two position switch. When the switch is in the "Off" position, no ELT alarms will be triggered. When the ELT is in the "Arm" position, a sudden impact will trigger an ELT signal which can be tracked by search and rescue personnel. Note: When fragile mode is enabled, an ELT alarm will cause the fire effects to persist until the ELT is turned off.


The paintkit system allows you to change the appearance of your helicopter. It is accessed through the @Paint sub-menu found on the @Admin menu. On this menu there are several built-in colors, and a "Custom" button to load a paint set from a separate "paintkit" prim. For custom designs you can either use a paintkit from a 3rd party vendor, or load your own texture set into the paint kit that came with your helicopter. To apply a paintkit, simply rez the paintkit near your helicopter and select "*Custom" from the @Paint menu. The helicopter will search for nearby paintkits and allow you to choose which you want to apply. Instructions on how to create your own custom paintkits can be found in the paintkit object.



Menus are only available to the owner and registered or guest pilots of the aircraft. In general button options beginning with an "@" are sub-menus, and options beginning with "( )" or "(*)" are options that can be toggled. The buttons on the main menu are:

Button Description
HUD Connect Reestablish connectivity between helicopter and HUD if it becomes disconnected, or if you wear the HUD while already seated.
@Options Control various flight option settings.
Park/Unpark Make the aircraft non-physical/physical. Normally this occurs automatically when you sit in the aircraft, but this option can be used to control this manually.
@Realism Enable or disable "realism" features of the aircraft flight characteristics.
@Get Get various items from aircraft.
@Admin Access owner-only options (owner only)
@Cheat Displays the "Cheat" menu with options to bypass various procedures. See "CHEATS" below for more details.
@REGISTER Access the aircraft registration menu. This button will only appear on the main menu if an N number has not yet been assigned.
Safe Unsit Slide avatar outside aircraft before unseating them. Useful when aircraft is physical.


The admin menu contains options only available to the aircraft owner. Buttons/Options are:

Key Description
Guest If enabled, anyone can sit in the pilot seat and fly the aircraft. If disabled, only the owner, or pilots explicitly added can fly the aircraft.
Passenger If enabled, allows anyone to sit in the passenger/co-pilot (left) seat. If disabled, only authorized pilots can use the co-pilot seat.
Eject Ejects whoever is sitting in the passenger seat. Use this to get rid of unauthorized passengers.
Add Pilot Add an authorized pilot. A maximum of 12 pilots can be registered. The pilot to be added should stand within 10m of aircraft to be recognized by the system.
Remove Pilot Remove a pilot from the authorized pilot list.
List Pilots List the authorized pilots.
Recal. W&B If you make any changes to the linkset, you should use this option to recalibrate the weight & balance for the scripts.
@REGISTER Assign or changer your aircraft's registration. See "N-NUMBER ASSIGNMENT" in Section 1 for more details.
@Paint Change the color/markings of your aircraft. See "PAINTKIT SYSTEM" below for more details.


The options menu is accessed from the @Options button on the main menu and is available to any registered pilot.

Button Description
Alerts If enabled, alert messages about collisions or other unsafe conditions will be given. If disabled, no alert messages will be issued.
Dust If enabled, dust effects are produced when the aircraft is near the ground, water, or over a prim.
Fragile If enabled, a crash will cause helicopter to burst into flames and become non-responsive. Resets after a set time (or until ELT is turned off).
Doors Enable to show doors, disable to hide doors.
Show/Hide GPS Show or hide the GPS device.
(n) Controls Select a control scheme. Control schemes are discussed in the CONTROLS section near the beginning of this document.
Skidlook Enabled modified camera view looking down toward skids. Due to SL limitations, you must unsit and sit for the new view to take effect.
Copilot Enable or disabled copilot controls


The cheats menu accessed from the @Cheat button on the main menu allows you to access functions to bypass several of the normal procedures.

Button Description
Charge Bat. Charge the battery to full.
Panel Fix If you forget to put your side panels back on before you take off, you will "loose" the side panels. Use this button to get your side panels back.
Fast Start/Stop Use this button to start or stop your helicopter without going through the full procedure. You will still need to wait for the rotors to come to full speed when using Fast Start.
@Fuel Accesses a sub-menu that lets you set the fuel level to a specific level.


The realism menu lets you enable or disable some of the RL helicopter flight characteristics. The features that can be enabled/disabled are:

Button Description
Density If enabled, density altitude will have an effect on aircraft performance. This comes in play when operating at high altitudes. At high altitudes hover height and climb rate will be reduced from their values at lower altitudes.
ETL When ETL (Effective Translational Lift) is enabled, additional lift/performance is gained when forward airspeed goes above about 20 mph due to the main rotors constantly moving into clean air. When disabled, the additional performance is always available.
Low RPM When enabled, pulling excessive collective can result in decay of main rotor RPM. Decay can occur when the MP gauge is above red line. If this effect is disabled, rotor RPM will not decay when pulling collective beyond the red line on the MP gauge.
Torque When enabled, torque effects from the main rotor will be experienced. Torque increases as collective is pulled and manifests as a right turning tendency. As a result, left pedal will need to be increased and maintained as collective is increased.
Vortex When enabled, the helicopter can be subject to "vortex ring state" also known as "settling with power". This can occur when the helicopter is in a vertical descent of more than 300 feet/min with a forward speed of less than 30 mph while collective is at more than 50%. When vortex ring state occurs, the helicopter will experience a loss of lift and begin descending rapidly, even if additional collective is pulled.
Translate If enabled, the effects and compensation for translating tendency will be active. The net effect is that the left skid will hang slightly low in a hover.