Создаем объет, вставляем в него скрипт. Прикрепляем объект как худ. Летаем!

А еще можно запихать в АО или другой худ, что б не слетал и глаза не мозолил...

float last_alt;
float last_time;
float last_move;
float boost;
integer controls;

float MIN_SPEED = 2.0;
float WANT_SPEED = 20.0;
float MAX_SPEED = 25.0;
float MIN_TIME = 1.0;
float DEFAULT_BOOST = 0.5;

float FAST_TICK = 0.1;
float SLOW_TICK = 1.0;
float LONG_TIME = 5.0; // reset boost if no work in a long time

float MIN_BOOST_HEIGHT = 72.0;
float MIN_BOOST_CLEARANCE = 36.0;

integer flying = -1;
integer falling = -1;
integer hovering = -1;
integer dimmed = -1;

integer HUD_OFF = 0;
integer HUD_ALWAYS = -1;
integer HUD_ON = 1;
integer hud_state = 1; // default HUD_ON

string last_hud_text;
integer hud_active = 0;
float last_hud_time = 0; 
show_hud()
{
  if(hud_state == HUD_ALWAYS)
  hud_active = 1;
  else if(hud_state == HUD_ON)
  {
  if(hud_active >= 0 && flying == 0 && hovering == 0 && falling == 0) hud_active = 0;
  else if(hud_active <= 0 && (flying > 0 || hovering > 0 || falling > 0)) hud_active = 1;
  }
  else if(hud_active == 1)
  hud_active = 0;

  if(hud_active == 1) {
  float time = llGetTime();
  if(last_hud_time > time - 1) return;
  vector v = llGetVel();
  vector p = llGetPos();
  string hover_text = "";
  if(hovering && controls == 0)
  hover_text = " (hover)";
  string boost_text = "Standby";
  if(!hovering)
  boost_text = "Passive";
  if(falling)
  boost_text = "Inactive";
  if(boost > 0 && controls > 0)
  boost_text = "Boost "+((string)llFloor(boost * 100.0 / 6.0 + 0.5))+"%";
  string hud_text = "";
  if(hud_state == HUD_ALWAYS)
  hud_text = "\nHUD locked";

  string t =
  "<"+((string)llFloor(p.x+0.5))+","+((string)llFloor(p.y+0.5))+","+((string)llFloor(p.z+0.5))+">"+
  " ("+((string)(llFloor(p.z-llGround(<0,0,0>)+0.5)))+"m AGL)\n"+
  "<"+((string)llFloor(v.x+0.5))+","+((string)llFloor(v.y+0.5))+","+((string)llFloor(v.z+0.5))+">"+
  " ("+((string)llFloor(llVecMag(v)))+"m/s)\n"+
  boost_text+hover_text+hud_text;
  if(last_hud_text != t) {
  vector color = <1,1,1>;
  if(hud_state == HUD_ALWAYS)
  color = <.3,1,.3>;
  llSetText(t, color, 1);
  last_hud_text = t;
  last_hud_time = time;
  }
  } else if(hud_active == 0) {
  last_hud_text = "";
  last_hud_time = 0;
  llSetText("", ZERO_VECTOR, 0);
  hud_active = -1;  
  }
}

set_hover(integer active)
{
  if(active == hovering) return;
  hovering = active;
  if(hovering)
  llSetForce(<0,0,9.8> * llGetMass(), FALSE);
  else
  llSetForce(<0,0,0>, FALSE);
}

float last_tick = -1;
set_tick(float tick)
{
  if(tick == last_tick) return;
  last_tick = tick;
  llSetTimerEvent(tick);
}

float last_boost_height;
float average_boost;
check_boost()
{
  flying = 1;
  falling = 0;

  integer info = llGetAgentInfo(llGetOwner());

  if((info & AGENT_FLYING) == 0)
  {
  set_hover(FALSE);
  falling = (info & AGENT_IN_AIR) != 0;
  flying = 0;
  boost = 0;
  set_tick(SLOW_TICK);
  return;
  }

  vector pos = llGetPos();
  if(pos.z < last_boost_height / 2) // trim running average of boost if big altitude drop
  average_boost = average_boost * (pos.z / last_boost_height)
  + DEFAULT_BOOST * (1.0 - pos.z / last_boost_height);

  if(pos.z < MIN_BOOST_HEIGHT || pos.z - llGround(<0,0,0>) < MIN_BOOST_CLEARANCE)
  {
  set_hover(FALSE);
  set_tick(SLOW_TICK);
  boost = 0;
  return;
  }

  set_hover(TRUE);
   
  if(controls <= 0) return;

  vector vel = llGetVel();
  float time = llGetTime();
  float speed = vel.z;
  float target = WANT_SPEED;
  float window = WANT_SPEED / 20;
   
  if(speed > 0)
  last_move = time;

  if(time - last_time >= LONG_TIME)
  boost = 0;
  else
  {
  if(speed < target - window)
  {
  if(boost == 0)
  boost = average_boost;
  if(time - last_move > MIN_TIME) boost += 0.4;
  else if(speed < target * 0.25) boost += 0.2;
  else if(speed < target * 0.5 ) boost += 0.1;
  else if(speed < target * 0.75) boost += 0.05;
  else if(speed < target - window * 4) boost += 0.02;
  else boost += 0.01;
  }
  else if(speed > MAX_SPEED) boost -= 0.5;
  else if(speed > target + window * 4) boost -= 0.1;
  else if(speed > target + window * 2) boost -= 0.03;
  else if(speed > target + window) boost -= 0.01;

  if(boost <= 0)
  boost = 0;
  if(boost > 0) {
  llApplyImpulse(<0,0,boost> * llGetMass(), FALSE);
  average_boost = average_boost * 0.9 + boost * 0.1; // 10 sample running average
  last_boost_height = pos.z;
  }
  }
   
  if(boost) set_tick(FAST_TICK);
  else set_tick(SLOW_TICK);
  last_alt = pos.z;
  last_time = time;
}

take_controls()
{
  llTakeControls(CONTROL_UP|CONTROL_DOWN,TRUE,TRUE);
}

request_perms()
{
  if(llGetPermissions() & PERMISSION_TAKE_CONTROLS)
  take_controls();
  else
  llRequestPermissions(llGetOwner(), PERMISSION_TAKE_CONTROLS);
}

init()
{
  boost = 0;
   
  flying = -1;
  falling = -1;
  hovering = -1;
  dimmed = -1;
  hud_state = HUD_ON;

  set_tick(SLOW_TICK);
  if(llGetAttached()) request_perms();
}

default
{
  state_entry()
  {
  init();
  }
   
  on_rez(integer param)
  {
  init();
  }

  run_time_permissions(integer mask)
  {
  if(mask & PERMISSION_TAKE_CONTROLS) take_controls();
  }
   
  control(key id, integer level, integer edge)
  {
  controls = 0;
  if(level & CONTROL_UP) controls++;
  if(level & CONTROL_DOWN) controls--;
  check_boost();
  }
   
  timer()
  {
  check_boost();
  show_hud();
  if(flying && boost > 0)
  {
  if(dimmed != 0)
  llSetAlpha(1.0,ALL_SIDES);
  dimmed = 0;
  }
  else
  {
  integer dimness = 4;
  if(hud_state == HUD_ON) dimness = 5;
  else if(hud_state == HUD_ALWAYS) dimness = 6;
  if(dimmed != dimness) {
  float alpha = ((float)dimness) / 10;
  llSetAlpha(alpha,ALL_SIDES);
  }
  dimmed = dimness;
  }
  }
   
  touch_start(integer num)
  {
  if(llDetectedKey(0) == llGetOwner())
  {
  hud_state++;
  if(hud_state > 1)
  hud_state = -1;
  }
  }
}