What is Carrier: Definition and 139 Discussions

The escort carrier or escort aircraft carrier (U.S. hull classification symbol CVE), also called a "jeep carrier" or "baby flattop" in the United States Navy (USN) or "Woolworth Carrier" by the Royal Navy, was a small and slow type of aircraft carrier used by the Royal Navy, the United States Navy, the Imperial Japanese Navy and Imperial Japanese Army Air Force in World War II. They were typically half the length and a third the displacement of larger fleet carriers, slower, carried fewer planes, and more-lightly armed and armored. Escort carriers were most often built upon a commercial ship hull, so they were cheaper and could be built quickly. This was their principal advantage as they could be completed in greater numbers as a stop-gap when fleet carriers were scarce. However, the lack of protection made escort carriers particularly vulnerable, and several were sunk with great loss of life. The light carrier (U.S. hull classification symbol CVL) was a similar concept to the escort carrier in most respects, but was fast enough to operate alongside fleet carriers.
Escort carriers were too slow to keep up with the main forces consisting of fleet carriers, battleships, and cruisers. Instead, they were used to escort convoys, defending them from enemy threats such as submarines and planes. In the invasions of mainland Europe and Pacific islands, escort carriers provided air support to ground forces during amphibious operations. Escort carriers also served as backup aircraft transports for fleet carriers, and ferried aircraft of all military services to points of delivery.
In the Battle of the Atlantic, escort carriers were used to protect convoys against U-boats. Initially escort carriers accompanied the merchant ships and helped to fend off attacks from aircraft and submarines. As numbers increased later in the war, escort carriers also formed part of hunter-killer groups that sought out submarines instead of being attached to a particular convoy.
In the Pacific theater, CVEs provided air support of ground troops in the Battle of Leyte Gulf. They lacked the speed and weapons to counter enemy fleets, relying on the protection of a Fast Carrier Task Force. However, at the Battle off Samar, one U.S. task force of escort carriers and destroyers managed to successfully defend itself against a much larger Japanese force of battleships and cruisers. The Japanese met a furious defense of carrier aircraft, screening destroyers, and destroyer escorts.
Of the 151 aircraft carriers built in the U.S. during World War II, 122 were escort carriers, though no examples survive. The Casablanca class was the most numerous class of aircraft carrier, with 50 launched. Second was the Bogue class, with 45 launched.

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  1. 6

    Effective mass of a charge carrier

    What is the effective mass of a charge carrier, numerically? Is it equivalent to the mass of an electron? Is it the same for negative charge carriers as it is for positive charge carriers?
  2. E

    Temperature dependence on intrinsic carrier concentration

    How does one calculate the intrinsic carrier concentration Ni for silicon as a function of temperature? I know the equation ni^2 = Nc*Nv exp(-Eg/kT) can be used, but then another equation is needed to find the energy band gap Eg. The effective density of states values Nc and Nv are well...
  3. C

    Aircraft Carrier Forces on Impact

    I need help finding the forces when an aircraft’s jump cable catches to stop a plane on an aircraft carrier ship. The aircraft is traveling at 110 mph with the front of the plane 3 feet off the deck of the ship. If the assumption is made that the cable stops the aircraft immediately (the cable...
  4. C

    Calculating Impact Force for Aircraft Landing on Carrier Ship

    Homework Statement An aircraft is landing on a carrier ship in the middle of the Pacific. When the aircraft’s jump cable catches to stop the plane, the aircraft is traveling at 110 mph with the front of the plane 3 feet off the deck of the ship. If the assumption is made that the cable...
  5. N

    Carrier Mobility of a semiconductor

    Eg) Silicon Material When we say about mobility of a semiconductor - we basically have to consider its properties etc. One of it is impurities. Here we have to consider its TOTAL Dopant Concentration?
  6. G

    Why does a high optical carrier feq. provide higher transmission rate?

    For example , optical carrier in the infra red region can provide higher capacity than microwave.
  7. W

    Understanding carrier waves?

    Hello. I am trying to teach myself some information about radio engineering. I keep getting stuck on the concept of carrier waves. I understand their uses and what they look like, but I do not understand what causes them or why they are needed. Any clarification or analogies would help. I only...
  8. J

    Optics question - carrier waves

    I am trying to understand what exactly the envelope is and why does the irradiance have twice its frequency? In class my teacher showed that when you sum individual waves, you get the carrier wave. Then my teacher showed something called an envelope, which looks a lot like an oscillating sine...
  9. S

    Wavelength of carrier frequency radio signal

    Homework Statement Your favorite radio FM radio station broadcasts at a carrier frequency of 94.7 Megahertz. What is the wavelength of the carrier frequency radio signal? Homework Equations velocity=wavelength(frequency) The Attempt at a Solution 94.7x10^-6(w)= 3x10^8 w= 3.2...
  10. C

    Are force carrier particles instantaneous like gravity in relativity?

    if particles can transfer force carrier particles to each other to generate forces between them such as quark -gluon exchange, is it an instaneous effect? or is it like gravity in relativity where the effects are not immiediately felt but take time such as for the force carrier particle to...
  11. X

    The Carrier of an EMF: Resistance & Quantum Mechanics

    The Carrier of an Emf is in many definite/indefinite parts the net of the circuits Total Resistance (Rt). These definite/Indefinite parts are the SMALLEST degree expressed to that of a single atom, the basic Resistive properties or qualities of Itself, and the electron structure as pertaining to...
  12. T

    Why does massive carrier implies finite range?

    Back on lecture about Standard model, professor said that original Weinberg-Salam-Glashow theory had to be augmented with Higgs mechanism because it didnt give rise to massive gauge fields, yet since weak interaction had finite range they knew it had to have a massive carrier, well three of them...
  13. S

    Charge carrier concentration measurements in working electrode

    Dear All I will be grateful for any idea on how to measure electrochemically the charge carrier in an electrode say working electrode made of Al. Thank you from advance Shay
  14. E

    Charge density, carrier concentration, or Hall coefficient for Indium Arsenide?

    I've been searching for an acceptable value for the charge density of indium arsenide; that is, the amount of charge per cubic meter. I have been unable to find anything. I'm working on a replication of the Hall Effect, and I need an accepted value for comparing my own results. I've searched...
  15. R

    Photon as electrical force carrier

    I'm reading Feynman's book QED, and while I'll need at least another couple of read-throughs to grasp what I can, there are already a few fundamental questions I have. Feynman explains that electrons and protons within an atom exchange photons (p. 113 of my copy). I'm interpreting this as the...
  16. T

    Intrinsic Carrier Concentration for Carbon

    Hello everyone. Right now I'm learning about carbon electrical properties for my final assignment in college. But somehow i just can't find the intrinsic carrier concentration properties for carbon. I've found the graphics that show me the relationship between the intrinsic carrier...
  17. J

    Design a Power Amplifier Circuit for 1MHz Carrier Wave

    i designed an crystal oscillator of 1MHz using MC14069 ic and now i need the design of a power amplifier circuit to increase the power of the 1MHz carrier wave...can somebody help me with this!
  18. J

    Updating Carrier Momentum after Scattering

    Homework Statement Updating the carrier momentum after scattering is most easily accomplished in the rotated coordinate system. The rotated x-axis is related to the original x-axis by x_{r} = Y_{\theta}Z_{\varphi}x where Y_{\theta} describes a rotation of {\theta} about the y-axis, and...
  19. C

    Relative Velocity of an aircraft carrier

    Homework Statement The Attempt at a Solution Vch = Vce + Vhe Do I have this correct? I am guessing I need to find the velocity of the carrier with the respect to earth, and also find the velocity of the helicopter with respect to earth. Than with these two answers I can find...
  20. M

    How to calculate the carrier concentration

    Can any please help me in solving the following two questions Q1 A Si sample is doped with 10^16 per cm cube boron atoms and a certain number of shallow donors. The fermi level (Ef) is 0.36 eV above Ei (intrinsic energy level) at 300K. What is the donor concentration Nd? For Si at 300K...
  21. R

    Calculating Torpedo Angle & Travel Time to Hit Carrier 5 Miles N

    need help.. carrier 5 miles N of sub traveling E @ 3mins/hr. sub has torpedoe travel @ 40 knots. what is the angle and distance travel of torpedoe to hit carrier, what is travel time . with respect to original sighting
  22. M

    Effective density & Intrinsic carrier concentration

    Homework Statement Given "n=Nc*e-(Ec-Ef)/KT", prove "n=ni*e(Ef-Efi)/KT" Homework Equations Quasi-Fermi Energies..? Ef is Fermi level (extrinsic) and Efi is Fermi level (intrinsic). Ec is Fermi level (conduction). The Attempt at a Solution Very honestly, I cannot figure out how to...
  23. E

    Speed aircraft carrier based on reflected pulse frequency

    Homework Statement Submarine is traveling at 12 m/s toward an aircraft carrier emits a 2400 Hz sonar pulse. The reflected pulse returns with a frequency 2310 Hz. What is the speed of the aircraft carrier? (Positive/negative means the carrier is moving toward/away from the submarine.) The...
  24. B

    Motorcycle Carrier: Adding Load to Rear/Front Axles

    Thanks for all the help with the information you all gave me on making an motorcycle carrier on the back of my Motor-home, I downsized from wanting to carry my Goldwing (800#) to carrying my Suzuki 400 DRZ 400 lbs with carrier. The added load to the rear axle and the load off the front axle was...
  25. K

    Which US cell carrier has the shaking hands as a logo?

    Just read the title. That's all I want to know.
  26. A

    Calculating Plane's Work and Force on Aircraft Carrier

    A plane weighing 220 kN (25 tons) lands on an aircraft carrier. The plane is moving horizontally at 63 m/s (141 mi/h) when its tailhook grabs hold of the arresting cables. The cables bring the plane to a stop in a distance of 89 m. (a) How much work is done on the plane by the arresting...
  27. K

    How is voice demodulated in AM radio?

    Good Day, Can some one tell me any reading about structure of voice? Things I need to know (in AM radio) amplitude madulation of voice and also demodulation of it. When we demodulate it do we use some carrier frequency to so people can hear that? Thanks
  28. Pengwuino

    The Kitty Hawk is still active in Japan.

    Does anyone know what kind of time it takes for an aircraft carrie to reach full speed if it starts from rest? Specifically a nuclear powered US carrier (nimitz maybe?). Someone said it takes 5 hours and I am just having a hard time believing it.
  29. H

    Chapter 12: The Carrier Theory of Causation

    Thus far in part II of the book, we have reconsidered the metaphysics of causation, rejecting notions of causal responsibility as the core explanatory target of a theory of causation and constructing a richer and more objective Theory of Causal Significance. With a new theory of causation in...
  30. P

    Calculating Charge Carrier Density in Materials: Formula and Table of Values

    I've been trying to find a formula for calculating charge carrier density of a material, or a table of values , but can't seem to find any. If anyone knows of a link to a formula or table, any help would be welcome. Thanks, Plas
  31. I

    Photodiode carrier transit time

    Hello, I am having a bit of trouble with the following problem: Assuming a built in voltage equal to the bandgap voltage, calculate the slowest possible transmit time for a carrier with 5V reverse bias applied to the GaAs photodiode. I would be able to do this problem without difficulty if...
  32. A

    Photon as force carrier particle

    To my embarrassment I realized I do not understand this. How does a photon mediate the EM force? If I put two magnets close to each other then there is no EM radiation jumping from the one to the other. So how does the photon carry the particle? I know that very magnet has a Magnetic field...
  33. M

    Calculating Charge Carrier Density and Average Speed in a Copper Wire

    An end of chapter question that i don't really know how to do.. Question: A copper connecting wire has a cross-sectional area of 3mm^2 and is 30cm long. (A) Estimate the amount of free charge in this wire. (B) How long will it take for all this free charge to pass through the wire when a...
  34. S

    Photon: The Force Carrier That Moves at Light Speed

    Photon doesn't interact with external force and move with light speed. But why can it act as force carrier, play a role in photoelectric etc.?
  35. F

    Observing & Identifying Carrier Particles

    How do you observe a carrier particle? How do you know that particles carry the strong force or weak force?
  36. H

    How far does the catapult hurl the truck?

    heres the problem: steam-powered catapult used to launch aircraft could "throw a nissan pick-up five miles(8045meters)" catapult has the power to accelerate 30-ton aircraft from zero to 160mph(71.511m/s) in just 2.5 seconds nissan pick up truck weighs 3500 pounds and the flight deck is 57...
  37. T

    Heredity and sex linked characteristics-possible male carrier?

    A discussion came to surface in my Biology II AP class about heredity and sex linked characteristics. Now with a female carrying two X gametes and a male containing an X and Y gamete, males are more prone to inherit sex linked characteristics such as red-green color blindness and hemophilia. The...
  38. B

    Broadband transmission, signal is sent by modulating a carrier

    Hi folks, quick question, i have just read a small snippet on data transfer that has sparked some thoughts. Basically it was this: Baseband transmission, one carrier frequency is used and the electrical signal is applied directly to the wires. Broadband transmission, signal is sent by...
  39. S

    Data Transfer To Brain By Carrier Waves

    I was wandering what area this would be called under Physics, however,The question is this... Considering that you have the ability to convert a text data or photo data into recognizable information to our brain, what would the possiblity be to transfer a 1,000 page textbook from a...
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