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enigma

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Posts posted by enigma

  1. To obtain an ICC you must pass the CEVNI first, that is the correct order, the CEVNI is part of the ICC.

     

    The RYA will issue the CEVNI and ICCs to UK nationals and UK residents. If you are resident in the UK no problem.

     

    For further help send an email to: training@cruisingschool.co.uk

  2. The boat was decending the lock, you can tell this because the single gate is behind the boat and the double gates in front, I know the canal. There as been a similar incident where a boat was going down a lock with a log between the hull and the lock wall. As the boat descended the lock the tapered walls jammed the log tighter and the boat began to rotate about its middle. The crew realized the problem and refilled the lock before it was too late. This seems the same scenario but the descent was not stopped until it was too late.

  3. A narowboat steers better forwards than backwards.

     

    When going forwards the propeller pushes water towards the back of the boat across the rudder. This makes the rudder effective because of all the water from the propeller flowing across it.

     

    When going astern the propeller pushes water towards the front of the boat away from the rudder. The rudder has little water flowing across it, just the speed of the boat in reverse, and is just about ineffective.

     

    When going forward, the water from the propeller because of the cork-screw movement of the water, tends to hit one side of the rudder more than the other. That is why the tiller tends not to be on the centre line of the boat and why it seems easier for the boat to turn one way rather than the other.

     

    What has been described in this thread as paddle wheel effect is formally known as prop effect. For a boat to feel prop effect the prop-shaft has to be at an angle to the water surface. It does not affect narrowboats with a horizontal prop-shaft, (I assume the vast majority have a horizontal prop-shaft and the slight bow up attitude that a narrowboat has is less than ½ degree and has no effect). For a full description of this effect have a look at this web page: http://www.cruisingschool.co.uk/home/icc/prop%20walk.pdf

     

    enigma

  4. A closable valve would need to be fitted in the pump-out pipe if you want to pump out through the hull. This is to prevent discharge into the canal or river but you may discharge overboard out at sea through the hull. A valve is not required in the breather pipe.

     

    enigma

  5. The Royal Yachting Association's minimum age for attending a Helmsman's Course is 12 years. Up to the age of 16, youths must be supervised by an adult.

     

    The responsibility of supervision would be decided by the insurance company or a judge in the event of an incident.

     

    Rod Fox

  6. I'm a sad git and have a copy of BW's Bye-Laws!

     

    "No person shall unless so authorised by the Board turn or caused to be turned the propeller or propellers of any vessel while such vessel is moored alongside any wharf, wall, bank or other work of the Board except as may be necessary for the proper navigation of the vessel."

     

    Other Bye-Laws say: Your cannot commit a nuisance. Throw or discharge into the canal. No abusive, offensive, or threatening language.

     

    The list covers all anti social behaviour.

     

    BW will send you a copy if you ask for one.

     

    Enigma

  7. Mud weights are no good for a narrowboat, there is no holding power, they will not hold an 18 ton boat.

     

    If travelling up river have it at the bow. If travelling down river have it at the stern if you do not want the boat to swing around when the anchor bites, especially if the river is not wide enough for the boat to swing around.

     

    The problem of an anchor becoming stuck under a root or rock can be prevented by using a tripping line.

     

    Have an anchor that you can lift!!

     

    Enigma

  8. The Vine is not to close

     

    "Cheers as historic pub saved

     

    Jubilant villagers and ale enthusiasts will be raising a glass or two as time has been called on plans to demolish a historic Kinver pub.

    Residents successfully campaigned against plans to build 35 flats and houses on the Vine Inn site, in Dunsley Road, but faced a second battle when it emerged the popular building could still be bulldozed.

    But South Staffordshire District Council has now confirmed the demolition plans have been refused as well.

    Campaigner and waterways expert Bob Clarke said: "We are delighted to know both applications have failed but we're not letting our guard down.

    "It proves beyond all doubt that the pub is a major player in the tourist industry. It is used 52 weeks a year by walkers, cyclists and tourists and if the pub wasn't there, there wouldn't be another restaurant of that type in the village."

    More than 900 objections were submitted to the housing plan with support from the Campaign for Real Ale (Camra), British Waterways, Staffordshire and Worcester Canal Society and the Inland Waterways Association.

    More than 40 boats dock outside the pub every day during the summer season and residents feared this would end if the pub was to be demolished.

    Tourism groups also opposed the plans and claimed the homes would rip the heart out of Kinver and the surrounding area, affecting not only residents but visitor numbers to the village.

    Mr Clarke added: "We have won the battle but we haven't won the war.

    "The owners Vine 2000 can rest assured that they will have just as much opposition if they plan to amend the application or appeal against the decision.

    "We will fight it."

    No-one from Vine 2000 was available for comment."

  9. Rapid pumping or waggling the tiller.

     

    When you push the tiller away from you, you speed up the rate of water flow across the rudder. More water, faster, means that the sideways thrust is greater and the turn accelerates. When you pull the tiller towards you the water slows down and the rate of turn reduces but at a slower rate. The net result is a faster turn and sore muscles.

  10. Alex

     

    The "Propeller Handbook" suggests an average gap between the rudder and propeller of 15 percent of the propeller diameter.

     

    The propellers on an aeroplane and a narrowboat are very different. An aeroplane propeller both pushes air rearwards (positive pressure) and sucks forward (negative pressure).

     

    A boat propeller only pushes water rearwards it does not produce any forward negative pressure. To do so would induce propeller cavitation and that is to be avoided.

     

    A narrowboat rudder is a flat plate it has no aerofoil shape. Therefore it cannot operate like a wing. An aircraft wing produces less pressure on the top of the wing than on the bottom. The equivalent of the top on a narrowboat is the rear face. As it is a flat plate the aerofoil affect is not there. A narrowboat rudder merely deflects the water sideways off its forward face.

     

    When the rudder is deflected about 60 degrees and the propeller is obscured by the rudder maximum water deflection will be achieved. Rudder deflection towards 90 degrees does not turn the boat.

     

    The main part of the rudder lies behind the shaft, the balance part is in front of the shaft. If there is no balance part the rudder is hard to move. If the balance part is too large the rudder is too easy to move and may snatch the tiller. The solution here is trial and error.

  11. Good for you, but be careful as you are technically not allowed to fly the White Ensign.

    I'm sure common sense will prevail and nobody will care but I believe that only commissioned

    HM ships can fly the ensign.

    Perhaps some RN bod here on the forum can enlighten us.

     

    Commissioned Royal Navy ships and members of the Royal Yacht Squadron only.

     

    But we should celebrate defeating the French and Spanish!!

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