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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
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||The examples and perspective in this article may not represent a worldwide view of the subject. (December 2010)|
Inflatable Rescue Boats (IRBs) are rubber boats with an outboard motor used in surf lifesaving. IRBs have been used for all forms of surf rescue, retrieval, and service by Surf Lifesaving in New Zealand and Australia since the late 1980s.
IRBs are made of rubber and consist of four inflatable tubes - two side tubes, a bow tube and a keelson tube. This specific feature coupled with the obvious fact that they are used in the water, has coined the term "rubber duck" or simply "duck" to describe an IRB. Typically the rubber is coloured a shade of red termed 'Rescue Red' although a particular make of craft manufactured by Arancia come in a shade of orange. They have a rigid floor piece and a rigid transom for fitting an outboard motor (usually 25 hp). This motor is capable of providing a maximum drive speed of between 25-30 knots on flat water. 2-Stroke fuel is stored in a flexible fuel bladder and is secured by 4 clips to the floor in the bow. An IRB is crewed by two people - an IRB Operator/Driver and an IRB Crewman. The Operator sits on the lower half of the port side pontoon where he operates the outboard motor to control the boat. He has foot straps to help him stay in the boat. His left hand can hold on to a strap on the port side pontoon and his right hand operates the outboard motor by means of a tiller arm and throttle. The Crewman sits on the upper half of the starboard side pontoon. A handle is attached by a rope to the nose of the boat for him to hold with his left hand, while his right hand may hold a strap attached to the starboard pontoon. He balances the boat and allows it to go over large waves before they break without flipping. He also assists when going through a breaking wave, commonly referred to as "punching-through". Two foot straps are available for his feet, but it is recommended when punching a wave to only have one foot in a strap.
In 1969, after returning from life guard duties in the UK, Warren Mitchell of the Avalon Surf Lifesaving Club, had the idea for a rescue craft that could be deployed quickly under varying surf conditions and was adaptable to different Australian beaches. The first IRB he developed was in conjunction with the Dunlop Company and utilised a 20 hp outboard motor. It measured four metres in length and set the precedence for the familiar IRB we now use today.
IRBs are of great value when patrolling a beach especially ocean surf beaches where either the surf is too powerful or the beach too large to perform rescues effectively on a board.
Prior to the start of a patrol, it is the driver's responsibility to ensure the craft is correctly set up and ready for patrolling duties. Typically this will involve inflating the crafts four pontoons to the correct pressure with a hand/foot or electric pump. The motor is test run in a tank of fresh water to check full function and reliability before installation to the transom. The fuel bladder is filled and installed along with a tow rope, rescue tube, two oars, and a blunt point knife as minimum. A check list is then filled in by the driver, after which the IRB may be signed on for patrol by radioing "Surf Command". At this point other patrol members assist to move the craft to a suitable launching position on the beach. The IRB is typically set up in a location outside of the safe swimming area defined by the patrol flags. Where applicable, the boat may be towed onto the beach by way of a tractor or small jeep and trailer.
When performing a rescue, the driver must negotiate large surf breaks and possibly obstacles such as rocks or other swimmers to reach the patient. The crewperson helps the driver by keeping a lookout for the patient and hazards. They are also instrumental in keeping the IRB balanced when crossing surf breaks and turning rapidly. The crewperson is also primarily responsible for bringing the patient on board, often during extremely dangerous and rapidly changing conditions, and looking after their welfare while at sea.
The crew of an IRB can communicate with the shore through various accepted hand signals or through modern waterproof radios which are becoming more popular.
During a patrol, an IRB will be left on the beach by the waters edge at all times ready for action. On a busy day an IRB may be permanently out the back checking on swimmers.
On conclusion of the patrol, it is imperative the IRB is correctly packed up and stored to ensure it is ready for use by the next patrol. This is also the responsibility of the driver, who will usually start by radioing surf command and signing the IRB off for the day. This may involve reporting any rescues as well as how many people are still on the beach and in the water. Once the IRB has been signed off, the boat is taken up to the club where the motor is removed and run in a tank of fresh water for approximately 10 minutes. This clears the remaining salt water still in the cooling system, and allows for a quick check over of important parts of the motor. At the same time the IRB is emptied of oars, fuel tank, tube etc. The IRB will require a thorough hose down to remove sand, salt and shell grit, on and inside the boat. Standing the boat upright against a wall allows the water to fall down and out of the boat taking with it these unwanted particles. The boat is then returned to the trailer and the four pontoons are allowed to semi-deflate, to prevent over-stretching of the seams and rubber. The driver will fill in a checklist and report any faults, problems or issues to the club mechanic before storing the craft and motor. He will also report weather conditions and rescues performed for the day.
In Australia, surf club members must hold the Bronze Medallion lifesaver qualification as well as obtaining a boat drivers' licence from state authorities to undertake an IRB training course. This course is usually arranged by the club when enough interested members have gathered. The course involves a small theory component on basic outboard motor mechanics, pontoon pressure as well as set-up and dismantling procedures. This is coupled with a much larger practical component. The practical sessions require learning basic operation and manoeuvring techniques as well as gaining the ability to negotiate large, rough surf, with and without a crewman.
Other practical components include:
Training typically takes 6–8 weeks, by which time the group members are ready to be assessed by a qualified person. Upon successful completion of the course members gain their Silver Medallion in IRB driving and may henceforth operate the IRB for the club. Annually, drivers must undertake a reassessment organised by the club to prove they are still proficient.
Nationally as from 1 January 2003, it became compulsory for club members to hold a crewpersons certificate in order to crew in an IRB. Previously, the minimum requirement for crewing in an IRB was possession of the Bronze Medallion. This changed amidst safety concerns over training procedures relating to the correct positioning of feet and body in the boat. It was decided that the skills involved in correctly and safely crewing an IRB were enough that a complete course was required of and by itself. Holders of the drivers certificate automatically qualified as crewmen.
IRBs are used for water cover during ocean sports, such as ocean swims, surf carnivals and triathlons. But during the winter months they are put to the test when clubs from around the state and nationally compete against each other by racing IRBs in a number of events: see IRB racing.