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The ram was then improved to give PTFE welder Factory the attackers protection from the arrows and stones of the defenders. A platform was built of wood and provided with wheels. A thick wooden roof supported by posts standing on the platform acted as a shield against arrows. The wooden beam, sometimes as long as 120 feet, was then hung from the underside of the roof by two very thick ropes. A crew of soldiers would take hold of the beam, and pull it back as far as they could, and let it go.

The huge beam would then swing back and strike against the wall with its iron head. This was continued day and night with one crew relieving another when it got tired. No wall could withstand the terrific pounding of a battering ram for very long. Knowing this, the defenders tried in all sorts of ways to destroy it before the wall broke down. Sometimes they tried to smash the roof in and kill the crew by dropping a heavy rock upon them. Another method was to throw down a heavy rope with a grapnel at the end. The grapnel was a long iron hook with five or six sharp curved claws on it. With this they tried to catch the head of the ram and pull it up over the wall. The name ram was used because the male sheep attacks by charging forward and striking its enemy with its head

RC helicopters are available in the market in different types and sizes you can have of your choice according to your budget and space. Your kid will b delighted if you present this flying machine to play.

Flying has always been interest of men since ages. One of the inventions in the flying industry is the helicopter. Remote Controle helicopters are a portrait construct of the helicopter; it can be used for technical and fun purposes, they are very easy to use and operate. Children are very enthusiastic to use RC helicopters .

The portrait is available in five types:

Electric: This is popular and affordable than other RC products, it makes no noise and powered by rechargeable battery.

Gas: These most advanced model of rc helicopters are equipped with an engine and powered with gas and this is nearly same to flying a real helicopter.

Micro: This is delicate and compact to use in indoors; this is tiny which stretches up to 8 inches.

Mini helicopter: These rc helicopters are equipped with a battery and very compact in size which makes it possible to fly indoors.

Toy rc helicopters: The most affordable type of Remote Control helicopter is Toy helicopter; to fly this lot of practice is required.

Throttle and pitch produce the lift or speed of the rc helicopters if flying in fast forward flight. The rudder is responsible for spinning and the elevator the forward and backward motions while aileron helps helicopter to move side to side