altitude   292

« earlier    

Consequences of a living on a sphere
Because the World is not flat, you can’t see forever. As you look out to the horizon the planet falls away from you. This limits what you can see.
An adult person of around 6 ft tall has eyes approximately 1.8 m above the ground (yes, I'm using the Metric system). For the radius of the Earth, I'm going to use the value 6,371 Km (the mean radius). ... The solution is that the furthest an adult can see is 4.79 Km (which is just short of 3 miles).

The top observation deck of the Eiffel Tower is at 273 m.
From this altitude, the horizon will be 58.98 Km away (36.65 miles).

The top floor of the Burj Khalifa tower in Dubai is 621 m high.
This would give a viewer a theortical view over the desert of 88.96 Km (55.28 miles).

An airliner cruising at 38,000 ft is at an altitude of 11.58 Km
Plugging this into the formula reveals an answer of 384.3 Km, which is 238.8 miles.

When we were dealing with small altitudes, the difference between the straight line distance, and the ground distance along the curve of a planet was insignificant. Let's calculate the delta between these two distances for our cruising aircraft.
For a plane at high altitude, the difference between the straight line distance to the horizon and the curved distance on the Earth is about 500 m. (The difference when dealing with our first example of a man of height 1.8 m is a fraction of a millimeter).

The Golden Gate Bridge, possibly the most photographed bridge in the World, spans the opening of San Francisco Bay. Completed in 1937, it boasts two towers of height 230 m and these are 1,280 m apart. The top of the Golden Gate Bridge is almost two inches wider at the top than the base because of the curvature of the Earth!
distance  horizon  propagation  sphere  aircraft  airplane  altitude  geometry  trigonometry  Pythagoras 
december 2018 by Tonti
[1803.03111] Steam balloon concept for lifting rockets to launch altitude
So ground filled steam balloon might not suck at larger sizes, for rockoons?
steam  lift  gas  high  altitude  balloon  rocket  launch  rockoon  space  research  technology 
november 2018 by asteroza
Ball Aerospace - OAWL- wind LIDAR
New compact wind LIDAR with long range, which in theory would allow a high altitude balloon to detect favorable wind directions and change altitude to maneuver, becoming effectively stationary.
wind  detection  LIDAR  DARPA  high  altitude  maneuvering  geostationary  stratellite  balloon 
november 2018 by asteroza
Ascent to Altitude as a Weight Loss Method: The Good and Bad of Hypoxia Inducible Factor Activation
> Disease states such as chronic obstructive pulmonary disease and cancer are conditions where there is a persistent loss of appetite with an increase in energy expenditure. Another situation in which weight loss is accompanied by appetite suppression and increased energy expenditure is when otherwise healthy subjects are taken to altitude. While the cause of weight loss in chronic obstructive pulmonary disease and cancer is complex and multifactorial, a feature these diseases share in common with normal subjects exposed to altitude is hypoxia (1). At altitude hypoxia is secondary to the reduction in barometric pressure causing a decrease in the inspired partial pressure of oxygen whereas hypoxia is due to parenchymal lung injury in chronic obstructive pulmonary disease. Hypoxia in cancer patients is more localized and results from tumor growth outstripping its vascular supply (2).

This review will examine the physiologic response to hypoxia and focus on those mechanisms which may contribute to weight loss in these otherwise disparate conditions. Several points will be emphasized. First, hypobaric hypoxia facilitates weight reduction not only by suppressing appetite but also by increasing energy expenditure. Second, up-regulation of hypoxia inducible factor (HIF) mediates the loss in weight, change in energetics, and
weight_loss  altitude  cancer  HIF  hypoxia 
october 2018 by porejide
Adjusting Cabin Pressure Eases Air Passenger Discomfort - ABC News
“Most aircraft cabins are pressurized to 8,000 feet above sea level, an altitude that lowers the amount of oxygen in the blood by about 4 percentage points, researchers say.

“This decrease in oxygen saturation isn’t enough to bring on acute mountain sickness, but pressurizing the cabin to 6,000 feet could help some passengers feel better when flying, concludes a study in the July 5 issue of the New England Journal of Medicine.”
planes  pressurization  travel  2018  altitude 
october 2018 by handcoding
Development and Experimental Validation of a Hall Effect Thruster RAM-EP Concept
Air breathing electric hall thruster concept for low orbital altitude satellites to maintain speed. Not a PROFAC air scooper per se, since this uses all inlet air for thrust. Beehive inlet as well.
PROFAC  low  orbital  altitude  drag  compensation  air  breathing  hall  effect  electric  thruster  space  propulsion  aerodynamics  research  technology  ramscoop  beehive  inlet 
april 2018 by asteroza
Conceptual Design of an Air-Breathing Electric Thruster
Seems beehive-style inlets for air scooping at low orbital altitudes are in.
PROFAC  low  altitude  orbital  atmospheric  gas  scoop  ramscoop  inlet  design  aerodynamics  space  research 
april 2018 by asteroza
Google Maps - Find GPS coordinates, longitude, latitude, altitude
Use this tool to find and display the Google Maps coordinates (longitude and latitude) of any place in the world.
NEW: Now we even show the sea level/elevation of the marked position!
Google-Maps  Google  Maps  GPS  coordinate  mapping  altitude  research  is:tool  geolocation 
march 2018 by jmi
The Global Airport Database
MIT Licensed global airport information. Not clear how often it is updated.
aviation  airport  location  altitude 
november 2017 by drmeme

« earlier    

related tags

020  1  2  2018  500px  acclimatisation  acrobat  acrobatic  activity  add  address  adhd  ads-b  adventure  aerial  aerodynamics  aeroplane  aerospace  agw  air-canada  air  aircraft  airplane  airport  airports  alert  amex  ancient  and  animals  animation  annapurna  antique  api  app  arduino  arhab  army  ashland  astronomy  atmosphere  atmospheric  auction  aviation  awaymsgused  awesome  baking  balloon  ballooning  barometric  beehive  birds  blogto_answer_my_searches  blood  blue  bmp085  boundaries  boxrranch  brain  breathing  cabin  cancer  cats  climbing  clock  clothing  clouds  co2  coastline  cognition  cold  coldweather  collector  colorado  comic  communication  communications  compensation  contraction  cooking  cooling  coordinate  cover  credit_card  cute  cycling  d2  daft  darpa  data  data_visualisation  dcde  debris  delicious  dem  demographics  denisovans  density  depression  design  detection  diabetes  diet  distance  distantfuture  dive  diving  dna  drag  drone  drug  drugs  duration  earth  edm  effect  effects  electric  elevation-gain  elevation  endurance  engineer  engineering  environment  esa  espar  estate  etiology  even  evolution  exercise  experiments  exposure  extreme  facebook  factor  fee  fees  flags  flight  flights  fluctuations  flying  food  foreign  form  free  fun  funny  gas  genetics  geo  geography  geolocation  geology  geometry  geostationary  global  glucose  google-maps  google  gps  grasshopper  gravimetric  greensprings  guide  hab  hale  hall  haps  hardware  health  heater  height  hi  hif  high  highaltitude  hiking  hills  himalaya  himalayas  hkit  holiday  horizon  humanengineering  humor  hydro  hypersonic  hypoxia  ifttt  india  inlet  inspiration  iot  iphone  is:tool  jacket  javascript  jr  kala  kessler  kit  l  ladakh  lake  land  lands  language  latitude  launch  layering  leo  lidar  life  lift  light  linguistics  llareta  location  logic  long  longitude  low  management  maneuvering  map  mapping  maps  mars  mask  mastercard  math  maximalexpression  measure  measurements  mechanical  medicine  metres  metrics  michigan  microsat  microsatellite  migration  miss  mobilize  model  monstercat  motorbike  mountain  mountains  mystery  nanosat  nanosatellite  nature  navigation  near  nearspace  network  neurobiology  neuroscience  new  nightscape  nigutse  nitrofun  obesity  optical  orbit  orbital  oregon  oxygen  pattar  performance  perou  photography  pht101  pht235  pikespeak  pinpoint  planes  plants  platform  population  pressure  pressurization  profac  profile  projectloon  propagation  propulsion  pseudosatellite  public  pv  pyrenees  pythagoras  radar  ramdiver  ramscoop  reaches  real  realtime  reference  reflections  rehabilitation  relay  remote  research  reunion  risk  river  rock  rocket  rockoon  rocks  routes  runn  running  sanfrancisco  satellite  science  scoop  sea  sensing  sensor  serotonin  shell  shrink  sky  skydive  skydiving  softer  soil  solar  soundremedy  space  spacex  sphere  sport  sprinter  stars  stats  status  steam  stratellite  stress  suicide  supplements  surveillance  syndrome  t2d  technology  texture  thruster  tibet  time  titan  tour  tracking  traction  training  transaction  transactions  transport  transportation  travel  trekking  trigonometry  trip  trsh  tumblr  tutorial  type  uav  urban_ecologies  usda  utah  van  variations  veloroutes  video  vienna  vizicities  warming  watch  water  weather  weight  weight_loss  westpac  wgs84  wikipedia  wildlife  wind  winter  work  world  wristwatch  xerophytic  xkcd  zephyr  zoom 

Copy this bookmark: