Shopping on line can be easy, simple and save you lots of money. It can also take a lot of your time, frustrate you, and result in unwanted purchases. Now the same can be said for regular high street shopping, but with the vast opportunity presented by the Internet it will pay you to spend a few minutes reading this and understanding how to better optimize your Thrust shopping experience:
1. Compare - without doubt the biggest advantage that the Thrust offers shoppers today is the ability to compare thousands of Thrust at a time. This is a great thing, but not necessarily all the time! Too much can be daunting at times so take advantage of the great comparison sites and where possible let them do the hard work for you.
2. Research - if it has been said it will be on the internet. Ignorance is no longer a justifiable reason for buying the wrong thing. Take the time to research in detail everything that you could possible want to know about
3. Testimonials - don't know anybody that has bought a Thrust? Wrong! If the Thrust is good the internet will let you know. Use the Internet as a friend and get testimonials before you buy.
4. Questions - Got a question about Thrust then search the Forums, FAQ's, Blogs etc. Don't be afraid to ask .....
5. Reputation - Never heard of the company selling Thrust? Don't worry, no reason why you should know every company in the world, but you know someone that does! Use the internet to find out what people are saying about Thrust and build up a picture of their reputation for sales, returns, customer service, delivery etc.
6. Returns - still worried that even after all of the above your Thrust wont be what you want? Check out the returns policy. There is so much competition now that someone, somewhere is bound to offer the terms that you are comfortable with.
7. Feedback - happy with your Thrust then let people know, after all you are depending on others people input in your buying decision, so why not give a little back.
8. Security - check for the yellow padlock on the Thrust site before you buy, and the s after http:/ /i.e. https:// = a secure site
9. Contact - got a question about Thrust, or want to leave a comment then check out the sites contact page. Reputable companies have them and respond.
10. Payment - ready to pay for your Thrust, then use your credit card or PayPal! Be aware of companies that don't accept them, there may be genuine reasons but given the huge amount of choice you have when buying online there is no reason at all not to buy via credit card or PayPal.
Thrust is a reaction (physics)
force (physics) described quantitatively by Isaac Newton's Newton's laws of motion. When a system expels or acceleration
mass in one direction the accelerated mass will cause a proportional but opposite force on that system.
Examples
A fixed-wing aircraft generates forward thrust when a spinning propeller moves air, or gases are ejected from a jet engine (or
rocket engine), opposite the direction of flight. The forward thrust is proportional to the (
mass of the air) multiplied by (average velocity of the airstream). Reverse thrust can be generated to aid braking after landing by reversing the pitch of variable pitch propeller blades, or using a Thrust reversal on a jet engine.
Rotary wing aircraft and
thrust vectoring V/STOL aircraft use engine thrust to support the weight of the aircraft, and vector some of this thrust fore and aft to control forward speed.
A motorboat generates thrust (or reverse thrust) when the propellers are turned to accelerate water backwards (or forwards). The resulting thrust pushes the boat in the equal and opposite direction to the sum of the
momentum change in the water flowing through the propeller.
A rocket's mass is propelled forward by a thrust force equal to, and opposite of, the time-rate of momentum change of the exhaust mass accelerated from the combustion chamber through the rocket engine nozzle. This is the exhaust velocity with respect to the rocket, times the time-rate at which the mass is expelled, or in mathematical terms:
T=v\frac{dm}{dt}
where:
T = thrust generated (force),
\frac {dm} {dt} = rate of change of mass with respect to time (fuel burn rate).
v = exhaust velocity.
Of course, for a launch the thrust at lift-off should be more than the weight, and with a fair margin, because a "slow launch" would be very inefficient.
Each of the three
Space shuttle main engines can produce a thrust of 1.8
meganewton, and each of its two Space Shuttle Solid Rocket Boosters 14.7 MN, together 34.8 MN. Compare with the mass at lift-off of 2,040,000 kg, hence a weight of 20 MN.
By contrast, the
simplified Aid for EVA Rescue (SAFER) has 24 thrusters of 3.56 N each.
In the air breathing category, the AMT-USA AT-180 jet engine developed for radio-controlled aircraft produce 90 N (20 Lbf) of thrust.{{cite web]-300ER, recognized by the Guinness Book of World Records as the "World's Most Powerful Commercial Jet Engine," have a tested thrust of 569 kN (127,900 lbf).
References
See also
Thrust is a reaction (physics)
force (physics) described quantitatively by Isaac Newton's
Newton's laws of motion. When a system expels or
acceleration mass in one direction the accelerated mass will cause a proportional but opposite force on that system.
Examples
A fixed-wing aircraft generates forward thrust when a spinning propeller moves air, or gases are ejected from a jet engine (or
rocket engine), opposite the direction of flight. The forward thrust is proportional to the (mass of the air) multiplied by (average
velocity of the airstream). Reverse thrust can be generated to aid braking after landing by reversing the pitch of variable pitch propeller blades, or using a
Thrust reversal on a jet engine. Rotary wing aircraft and thrust vectoring V/STOL aircraft use engine thrust to support the weight of the aircraft, and vector some of this thrust fore and aft to control forward speed.
A
motorboat generates thrust (or reverse thrust) when the propellers are turned to accelerate water backwards (or forwards). The resulting thrust pushes the boat in the equal and opposite direction to the sum of the momentum change in the water flowing through the propeller.
A rocket's mass is propelled forward by a thrust force equal to, and opposite of, the time-rate of momentum change of the exhaust mass accelerated from the combustion chamber through the rocket engine nozzle. This is the exhaust velocity with respect to the rocket, times the time-rate at which the mass is expelled, or in mathematical terms:
T=v\frac{dm}{dt}
where:
T = thrust generated (force),
\frac {dm} {dt} = rate of change of mass with respect to time (fuel burn rate).
v = exhaust velocity.
Of course, for a launch the thrust at lift-off should be more than the weight, and with a fair margin, because a "slow launch" would be very inefficient.
Each of the three Space shuttle main engines can produce a thrust of 1.8
meganewton, and each of its two
Space Shuttle Solid Rocket Boosters 14.7 MN, together 34.8 MN. Compare with the mass at lift-off of 2,040,000 kg, hence a weight of 20 MN.
By contrast, the
simplified Aid for EVA Rescue (SAFER) has 24 thrusters of 3.56 N each.
In the air breathing category, the AMT-USA AT-180 jet engine developed for radio-controlled aircraft produce 90 N (20 Lbf) of thrust.{{cite web]-300ER, recognized by the
Guinness Book of World Records as the "World's Most Powerful Commercial Jet Engine," have a tested thrust of 569 kN (127,900 lbf).
References
See also
- Gimballed thrust, the most common thrust system in modern rockets
- Thrust-to-weight ratio
- Thrust vectoring
Definition: thrust from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.
Thrust - Wikipedia, the free encyclopedia
Thrust is a reaction force described quantitatively by Newton's Second and Third Laws. When a system expels or accelerates mass in one direction the accelerated mass will cause a ...
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