OHM Airbus A380-800 Qantas 0.1

[misha.physics]

misha.physics submitted a new addon:

Airbus A380-800 Qantas - Airbus A380-800 Qantas aircraft based on Lua script

This add-on contains the Airbus A380-800 Qantas aircraft based on Lua script.

The mesh (3D model) together with a texture have been bought by me under "Standard License":

A380 800 3D Model - TurboSquid 1664899

Royalty free 3D model Airbus a380 800 Qantas for download as blend and fbx on TurboSquid: 3D models for games, architecture, videos. (1664899)

www.turbosquid.com

INSTALLATION: Unpack this add-on into Orbiter main directory.

There is a scenario located in /Scenarios/Airbus A380-800 Qantas.

Controls:

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Read more about this addon...

 

[misha.physics]

Hi,
it would be good to update this add-on in the future. You may contribute implementing better (more realistic) physical parameters/aerodynamic model for this aircraft, just take part in this discussion thread.

For now this add-on uses non-real physical parameters and DG flighf model, so it has too much lift-off and cruise speed. I suppose the following blocks in Lua script should be changed:

-- Main parameters

parameters =
{
  size = 46,                                    -- mean radius
  co = {x=0,y=1.1721,z=34.436},                 -- cockpit camera offset
  mass = 11000,                                 -- empty mass
  pmi = {x=15.5,y=22.1,z=7.7},                  -- principal moments of inertia
  cs = {x=53,y=186.9,z=25.9},                   -- cross sections
  rd = {x=0.25,y=0.3,z=0.1},                    -- rotation drag coefficients
  fuel = 13000                                  -- fuel mass
}

-- Touchdown points

gears =
{
  {pos = {x=0,y=-5.5,z=8.2728}, stiffness = 0.3e7, damping = 0.3e6, mu = 1.6, mu_lng = 0.1},      -- front
  {pos = {x=-3.5,y=-5.5,z=-1}, stiffness = 0.3e7, damping = 0.3e6, mu = 3.0, mu_lng = 0.2},       -- left
  {pos = {x=3.5,y=-5.5,z=-1}, stiffness = 0.3e7, damping = 0.3e6, mu = 3.0, mu_lng = 0.2}         -- right
}

-- Main thruster parameters

main_thruster_left =
{
  pos = {x=-1,y=0,z=-7.7},              -- thrust attack point
  dir = {x=0,y=0,z=1},                  -- thrust direction
  maxth0 = 1e5,                         -- max. vacuum thrust
  isp0 = 4e4                            -- vacuum ISP (fuel-specific impulse)
}

main_thruster_right =
{
  pos = {x=1,y=0,z=-7.7},               -- thrust attack point
  dir = {x=0,y=0,z=1},                  -- thrust direction
  maxth0 = 1e5,                         -- max. vacuum thrust
  isp0 = 4e4                            -- vacuum ISP (fuel-specific impulse)
}

-- Retro thruster parameters

retro_thruster_left =
{
  pos = {x=-3,y=0,z=5.6},               -- thrust attack point
  dir = {x=0,y=0,z=-1},                 -- thrust direction
  maxth0 = 2e4,                         -- max. vacuum thrust
  isp0 = 4e4                            -- vacuum ISP (fuel-specific impulse)
}

retro_thruster_right =
{
  pos = {x=3,y=0,z=5.6},                -- thrust attack point
  dir = {x=0,y=0,z=-1},                 -- thrust direction
  maxth0 = 2e4,                         -- max. vacuum thrust
  isp0 = 4e4                            -- vacuum ISP (fuel-specific impulse)
}

  -- Vertical airfoil function

  function VerticalLift(hVessel,aoa,M,Re)
  local quantity = 9
    local AOA = {-180*RAD,-60*RAD,-30*RAD,-2*RAD,15*RAD,20*RAD,25*RAD,60*RAD,180*RAD}
    local CL  = {       0,      0,   -0.4,     0,   0.7,     1,   0.8,     0,      0}
    local CM  = {       0,      0,  0.014,0.0039,-0.006,-0.008,-0.010,     0,      0}

    local i = 1
    while AOA[i+1] < aoa and i < quantity do
      i = i + 1
    end

    local cl, cm, cd
    if i < quantity then
        local step = (aoa - AOA[i]) / (AOA[i + 1] - AOA[i])
        cl = CL[i] + (CL[i + 1] - CL[i]) * step
        cm = CM[i] + (CM[i + 1] - CM[i]) * step
    else
        cl = CL[quantity]
        cm = CM[quantity]
    end
    local saoa = math.sin(aoa)
    local pd = 0.015 + 0.4*saoa*saoa
    cd = pd + oapi.get_induceddrag (cl, 1.5, 0.7) + oapi.get_wavedrag (M, 0.75, 1.0, 1.1, 0.04)
    return cl, cm, cd
  end

  -- Horizontal airfoil function

  function HorizontalLift(hVessel,beta,M,Re)
    local quantity = 8
    local BETA = {-180*RAD,-135*RAD,-90*RAD,-45*RAD,45*RAD,90*RAD,135*RAD,180*RAD}
    local CL   = {       0,     0.3,      0,   -0.3,   0.3,     0,   -0.3,      0}

    local i = 1
    while BETA[i+1] < beta and i < quantity do
        i = i + 1
    end

    local cl, cd
    if i < quantity then
        cl = CL[i] + (CL[i + 1] - CL[i]) * (beta - BETA[i]) / (BETA[i + 1] - BETA[i])
    else
        cl = CL[quantity]
    end
    cd = 0.015 + oapi.get_induceddrag (cl, 1.5, 0.6) + oapi.get_wavedrag (M, 0.75, 1.0, 1.1, 0.04);
    return cl, 0, cd
  end

  -- Airfoils

  vi:create_airfoil(LIFT.VERTICAL,{x=0,y=0,z=-0.3},'VerticalLift',5,90,1.5)
  vi:create_airfoil(LIFT.HORIZONTAL,{x=0,y=0,z=-4},'HorizontalLift',5,15,1.5)
      
  -- Control surface animations
    
  vi:create_controlsurface(AIRCTRL.AILERON, 0.3, 1.7, {x=-7.5,y=0,z=-7.2}, AIRCTRL_AXIS.XNEG, 1, LeftAileronAnimation)
  vi:create_controlsurface(AIRCTRL.AILERON, 0.3, 1.7, {x=7.5,y=0,z=-7.2}, AIRCTRL_AXIS.XPOS, 1, RightAileronAnimation)
  vi:create_controlsurface(AIRCTRL.ELEVATOR, 1.4, 1.7, {x=0,y=0,z=-7.2}, AIRCTRL_AXIS.XPOS, 1, ElevatorAnimation)
  vi:create_controlsurface(AIRCTRL.RUDDER, 0.8, 1.7, {x=0,y=0,z=-7.2}, AIRCTRL_AXIS.YPOS, 1, RudderAnimation)
  vi:create_controlsurface(AIRCTRL.ELEVATORTRIM, 0.3, 1.7, {x=0,y=0,z=-7.2}, AIRCTRL_AXIS.XPOS, 1)

If you have any suggestions on which parameters to use, please share them here. You can test them by editing the Lua script first.

 

[Buck Rogers]

Very nice!
Great job on the gear animation. Could do with some more TD points (wing tips) though- had a hard landing.

Back in the day there were soo many aircraft addons, especially with aircraft.dll, some of them probably have good data (or could even be updated). This is ths first one I could find on the quick https://www.orbiter-forum.com/resources/airbus-beluga-with-mplm.2366/, it's Spacecraft3, don't know if there's anything useful there.

Would be great if there was a LUA equivelant to Aircraft.dll, @Thunder Chicken's Helicopter script comes close and there was some jet engine code.

 

[misha.physics]

Thanks!

Could do with some more TD points (wing tips) though- had a hard landing.

Yes, it's needed to do together with new TD points coordinates, since now the aircraft flips over on its tail when braking with the reverse engines running. I can move the rear landing gear points back, but this increases the lift-off speed, so a new flight model is needed. This Lua script is easy to edit and doesn't require compilation, so it can serve as a test sample for users. Above I noticed code blocks that should be edited, I think.

So, everyone, feel free to change parameters in the script, try it, and let us know.