How do airplane speed measure?
463967
The first answer gives ground speed.\n\nAir speed is measured by a differenctial pressure arrangement, in which the air pressure on the leading edge of a wing is compared with the "static" pressure (a reading which is shielded from the effect of the aircraft's movement through the air.)
788979
For the add on: If a toy plane weighs two pounds, how fast should it accelerate? What unit of measurement would you use?\n\nNot sure what you're asking. Unless you're talking about how fast it would accelerate if you drop it. Then it would be vertically down at 32 ft/s^2 in a vacuum. No matter how much it weighs. (I'm using the English system units since you talked about pounds.)\n\nIf you're asking for an opinion of what would be a nice number for acceleration ... Well, if you wanted it to get up to a speed of 50 ft/s within 20 seconds:\nV = a*t or acceleration = V/t = (50 ft/s)/20 s = 2.5 ft/s^2\n\nI hope this helps
685470
the speed = distance/time
652612
An anemometer is the device that tells you how fast the wind is blowing.
106773
depends on the acceleration of the airplane or object. this found by vector addition. example: if an airplane or a rocket is falling freely (god forbid) all the objects inside will have 0 weight.
196706
Ships speed is measured in knots... the reason is that a sailor on the fantail had a length of line with knots tied at regular intervals.  A bucket was tied to one end of the line and pitched overboard.  The sailor would measure the time and then count how many knots had passed in that time and that is how speed was calculated.  This is going back to the days of wooden ships.
400216
It depends on windspeed and direction, and the planes direction in relavence to that speed and direction. It depends on the speed of the plane. It depends on the density of the object, because of wind resistance. EX. feather would be close, lead ball would be further. Your question is like me saying, "I am in a car, how long will it take me to get to McDonalds?" Not enough info
1000570
Here's one: Measure the density of air.\n\nTake a flask, weigh it.\nVacuum out all the air, then weight it again.
873342
Bars and millibars.\n\nI check aviation Altimeters and we set them to 1013.25mb for testing (QFE).
424377
It is extremely complicated. Readings from on-board accelerometers that measure how much speed the rocket engines gave to the space craft, direction data from on-board gyroscopes and optical star trackers indicating the direction that acceleration occurred, Doppler data from the radio link with Earth that measures how fast the space craft is moving away from or toward the ground station are all loaded into a computer that does a big complicated calculation that takes into account the gravity of the Earth, Sun, Moon, planets, and sometimes asteroids and even the Galaxy to compute what is called a state vector. The state vector is the position and velocity of the space craft. It is very complicated and could never be done in time my hand.
283146
you could make it in one second or beyond 12 hours depending on where you are, excluding flight delays at al. it should not actually take long enough to measure in days, unless you are travelling by boat/ship
533244
The different control surfaces on the wings and tail can control both the angle of the plane and the amount of lift that the wings provide, while varying the engine power can control speed. For example, before landing, a plane is going much slower than crusing speed, but the flaps on the wings are extended, creating a little more drag, but increasing the lift.
1152034
Well, if you know the thrust of the engines, and can measure the acceleration of the aircraft, you can calculate the mass of the plane.
221681
WHY DO PEOPLE MENTION THE SPEED OF LIGHT OR FREQUENCY SHIFT OR THE WORD DOPPLER FOR DISTANCE FINDING THEY HAVE NOTHING TO DO WITH RADAR DISTANCE MEASURING.\n\nDOPPLER IS USED TO MEASURE SPEED OF VEHICLES , BASEBALLS ETC. OR DETECT MOTION LIKE THE MOTION IN CLOUDS, TORNADOS, HURRICANES OR THE MOTION OF AIRCRAFT IT IS USED TO DETECT MOVEMENT . \n\nIN DISTANCE MEASURING A MAGNATRON TRANSMITTER TUBE EMITS A SIGNAL DOWN A WAVEGUIDE. A HOLLOW SQUARE COPPER TUBE , IT GOES TO A ELECTRONIC LENS TO A PARABOLIC ANTENNA.  THE SIGNAL TRAVELS THROUGH THE AIR, HITS THE TARGET, BOUNCES OFF, AFTER TRANSMITTING THE RADAR SET GOES INTO RECEIVING,  THE RETURNING SIGNAL HITS THE PARABOLIC ANTENNA IS FOCUSED INTO THE WAVEGUIDE AND TRAVELS BACK TO THE RADAR SET.  THE TIME IT TAKES FOR THE SIGNAL TO RETURN IS HOW FAR THE TARGET IS AWAY FROM THE RADAR ANTENNA!  THE FURTHER AWAY THE LONGER IT TAKES FOR THE SIGNAL TO RETURN.  IT IS NEAR THE SPEED OF LIGHT BUT NOT THE SPEED OF LIGHT!\n\n\nFAR AWAY TARGETS REQUIRE PULSES AT A SLOWER RATE THAN WHEN THE TARGET IS UP CLOSE, UP CLOSE THE PULSE RATE OF THE TRANSMITTER IS QUITE RAPID!  HIGH POWER SEARCH RADAR MIGHT HAVE A PULSE RATE OF 60 PULSES A SECOND FOR LONG RANGE SCAN, WHILE A CLOSE IN RATE CAN RUN OVER 1000 PULSES PER SECOND WHEN AN AIRCRAFT APPROACHES A SHIP TOO CLOSE! \n\nJUST BASED ON THE SPEED THAT RADIO WAVES TRAVEL IN THE ATMOSPHERE, HOW FAR THEY WILL TRAVEL IN SO MANY ZILLIONTHS OF A SECOND!\n\nEARLY RADAR USED ONLY AN OSCILLOSCOPE STRAIGHT LINE WITH A STRAIGHT LINE ON THE LEFT BEING THE TRANSMITTED PULSE AND THE RETURN(S) BEING BUMPS OUT TO THE RIGHT THE DISTANCE BEING THE MEASUREMENT FROM LEFT TO RIGHT! AND THERE WERE MECHANICAL METERS THAT SHOWED WHERE THE ANTENNA WAS AIMED!\n\nTHE RADAR USED IN HAWAII WHEN WE WERE BOMBED BY THE JAPANEESE AT THE BEGINNING OF WW2 WAS THIS TYPE OF DISPLAY!\n\nSO MUCH FOR HISTORY !\n\nHAVE A GOOD DAY.\n\nAPS
767279
Cruising speed: in aeronautical style of expressing units,\nMach 0.85 - Intercontinental\nMach 0.845 - Freighter\n\nfor us to understand, it is about 570 mph
257417
With an anemometer is like three sticks with a little cup on each end, arranged at 120° at the top of a pole wich rotates faster or slower depending on wind speed. You can see them at ships and airports...
1021176
One of the most basic flight envelopes defines the condition extremes under which a given aircraft with given weight can sustain level flight. See ref. The coordinates are airspeed and either air density or altitude. From this envelope one can easily find the maximum and minimum (takeoff, stall) speeds, maximum speed at a specified altitude, and maximum altitude.\nThere are many other kinds of envelope, where (for instance)maximum maneuvering accelerations in g, cargo capacity or glide ratio are plotted as a function of altitude or speed. Most envelopes are influenced by, and therefore defined for specified values of, sea-level air pressure and temperature. Some envelopes are purely functions of power and airfoil characteristics, and others may have additional constraints (i.e., portions of the envelope border) defined by airframe strength limits.