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Hovercrafts - The Perfect Educational Toy

Very small hovercraft such as those made as children's toys are huge fun and have lots of advantages over their bigger cousins. the concept of using air pressure underneath a vehicle as a means of transport was first postulated in 1870, but the materials and engines required to create one were simply not available at that time. Due to these constraints, the first hovercraft appeared as children's toys, which must have helped immensely in their development.

Most people have seen the table game at the seaside where two players stand opposite each other and try to knock a flat plastic disc into the opposing goal. Basically, the disc is an air cushioned vehicle, but it doesn't produce it's own lift. The air pressure that lifts it comes from small holes drilled into the table driven by an electric pump underneath. Hardly a practical means of propulsion for a full size hovercraft, but it does demonstrate the principle very nicely.

Some enterprising kids have even constructed (almost) working one-man ACVs from a simple board and a vacuum cleaner. There isn't quite enough lift to support the vacuum cleaner as well, so a pipe extension is need so that there's a little mobility. I haven't seen one of these, but I'm sure they exist on Youtube. I strikes me that stability would be a major problem though, as there is not design the underneath surface of the board and the skirts are normally very basic. See

With the advent of molded plastic materials and relatively powerful small DC electric motors, battery powered hovercrafts of a reasonable size started to appear. The real enthusiasts build their own using balsa wood for lightness and two stroke aero engines for lift and forward thrust. These little beauties can reach speeds of 30 to 40 kph and are controlled by radio from a central station with a joy stick for the steering. The great thing about building models is that it's just change of scale to make a working model big enough to ride, and then it gets really exciting!

The dynamics of larger craft are quite different however. Although the principle is the same, larger volumes of air just don't act in the same way. Variations in pressure cause turbulence and this affects the handling of the hovercraft. The bigger types will tend to 'bounce' up and down a little, and also the turbulence will subtly affect the handling. The sheer inertia of a heavier machine means that stops and turns need to be anticipated well in advance, instead of reactng to them as they appear.

Selecting From Used Cars In Kent Uk And Your Options

If you want to get to know what your used cars in Kent buying options are, you've come to the right place. There are a number of great vehicles that you can get for a great price. Make sure you use this information so you don't have to pay too much or get a vehicle that doesn't work properly.

A used vehicle is going to have to be in good shape before you take it home. Don't just trust that you're getting a great deal and a car that's going to run well because a lot of the time dealers are not going to tell you the full story about a vehicle. If you're good with cars, then you can test drive it and see if there are any problems. If not, then just take someone along with you that can help you determine if there is anything wrong with it and if so you can either avoid buying it or ask for money off of the price.

A used vehicle is going to need to be priced fairly, and you can find this out through looking for other vehicles that are the same year and model. Of course, you're going to get a better deal the less it has been used because those with high mileage are going to be less likely to last as long. Certain types of cars or trucks are going to be well made and last longer, and some are just not good to buy at a high mileage.

Do you want to trade in your vehicle so you can get a used one that's going to be a little cheaper depending on what you can trade in? When you take your vehicle to trade it, make sure you go online and look for what it will sell for by finding other ones that are in similar shape and that are the same year. Don't just bring it in and expect to get a lot if there are problems with it because they will check it. Also, you need to clean it and take it through a car wash just to have it looking nice so you are likely to get more for it.

Try to get a warranty of some kind that lets you take the vehicle back for another or to get it fixed free if something is wrong with it. You may end up getting it home, only to find out that there is some kind of problem that you're going to have to fix before you can safely drive. Don't just chalk it up to bad luck if you don't have to, because some dealerships will do a fix for free if it was a problem they missed.

Your used cars buying options for the Kent area are varied and you can always find what you need. The rarer the vehicle, the more research you will have to do. Be sure you use these pieces of advice and you'll find any vehicle you need.