Hairy Poppins Posted August 4 Share Posted August 4 28 minutes ago, Gladys said: Yes, I heard that too. Hope all is well. Yes. Quote Link to comment Share on other sites More sharing options...
Fred the shred Posted August 4 Share Posted August 4 If it is tied up perhaps they are just having a drill although not great weather for it. 1 Quote Link to comment Share on other sites More sharing options...
John Wright Posted August 4 Share Posted August 4 She set off 20 minutes late and is steaming at 18.4 kts Quote Link to comment Share on other sites More sharing options...
Barlow Posted August 4 Share Posted August 4 On 7/21/2024 at 11:32 AM, La Colombe said: Here's a mythterious local connection. [Youtube video] And the local connection? Quote Link to comment Share on other sites More sharing options...
Kopek Posted August 4 Share Posted August 4 isn't it just the sailing is due signal? Hurry along the prom with your suitcase? I think they may have re-introduced this recently??? Unless some SP staffer has died? Quote Link to comment Share on other sites More sharing options...
monasqueen Posted August 5 Share Posted August 5 On 8/3/2024 at 6:35 PM, Happier diner said: Was it behind schedule? I have noticed vibration when it's flat out. That's normal on a boat. From a lifetime of travelling on a large variety of ships. I do not recall that level of vibration being normal, whatever the speed. There are some light fittings on Manxman that I will not sit under, because they shake and rattle so much. It seems she vibrates most when doing over 17.5 knots. Is that flat out? She can't keep to schedules at that speed. Have you noticed that the Sailing Updates only rarely now give an update to "Expected Arrival" times for Manxman? Are they trying to hide something? Wasn't she supposed to be faster than her predecessor? Quote Link to comment Share on other sites More sharing options...
Gladys Posted August 5 Share Posted August 5 8 hours ago, Kopek said: isn't it just the sailing is due signal? Hurry along the prom with your suitcase? I think they may have re-introduced this recently??? Unless some SP staffer has died? That was a couple of short toots as I recall, not the several followed by a long toot. Had to be unusual to have noticed it. Quote Link to comment Share on other sites More sharing options...
Dirty Buggane Posted August 5 Share Posted August 5 Most likely a manoeuvring signal, such as 1 long 3 short going astern at dock Quote Link to comment Share on other sites More sharing options...
Gladys Posted August 5 Share Posted August 5 8 minutes ago, Dirty Buggane said: Most likely a manoeuvring signal, such as 1 long 3 short going astern at dock No, it was several short blasts followed by one long blast. Quote Link to comment Share on other sites More sharing options...
Dirty Buggane Posted August 5 Share Posted August 5 Abandon ship is not likely to be used in port, may of been used to test ships horn (oooh matron) as this cannot be confused with manoeuvring signals. 1 Quote Link to comment Share on other sites More sharing options...
Happier diner Posted August 5 Share Posted August 5 2 hours ago, Gladys said: No, it was several short blasts followed by one long blast. I have heard it too when its in port. It must be testing Quote Link to comment Share on other sites More sharing options...
Happier diner Posted August 5 Share Posted August 5 (edited) 3 hours ago, monasqueen said: From a lifetime of travelling on a large variety of ships. I do not recall that level of vibration being normal, whatever the speed. There are some light fittings on Manxman that I will not sit under, because they shake and rattle so much. It seems she vibrates most when doing over 17.5 knots. Is that flat out? She can't keep to schedules at that speed. Have you noticed that the Sailing Updates only rarely now give an update to "Expected Arrival" times for Manxman? Are they trying to hide something? Wasn't she supposed to be faster than her predecessor? Vibration is often caused by cavitation. Cavitation is where there is an area behind the prop where water vapour is formed (cold steam in effect) and builds up. Same happens with pumps. Its caused by a low pressure zone because the prop is over pulling the water forward and reducing its pressure. A prop is usually built for an optimum rotation speed which would typically be at the top end (but not max) of a vessels cruising speed. However there are times when max speed is needed and often in this scenario the pump (or prop) is operating outside of its optimum and cavitation will start. Its harmless in small quantities. Run this was all the time will cause wear on the prop and the turning gear. Think of it as No11 on the volume of your marshall amp (Spinal Tap) I don't know if its this but it would add up as its always when its pushing hard to catch up It also does it when turning left out of Heysham but I have no idea why Edited August 5 by Happier diner Quote Link to comment Share on other sites More sharing options...
ccsnet Posted August 5 Share Posted August 5 (edited) 36 minutes ago, Happier diner said: It also does it when turning left out of Heysham but I have no idea why I was told lack of water underneath a couple of sailings back but did seem on the extreme end and lasted for quite a while. T Edited August 5 by ccsnet 1 Quote Link to comment Share on other sites More sharing options...
Dirty Buggane Posted August 5 Share Posted August 5 Cavitation can also cause scaring and wear on the blades of a prop so should not taken lightly. Also cause it to run out of ballance as one blade is biting into water whilst another is clawing at a vacum. Quote Link to comment Share on other sites More sharing options...
Omobono Posted August 5 Share Posted August 5 1 hour ago, Dirty Buggane said: Cavitation can also cause scaring and wear on the blades of a prop so should not taken lightly. Also cause it to run out of ballance as one blade is biting into water whilst another is clawing at a vacum. didn't they have a shipyard team from Korea recently looking at the cavitation or vibration problems just at the start of the summer , she does vibrate a bit but modern welded hull constructed ships tend to do , not like the old riveted hulls Quote Link to comment Share on other sites More sharing options...
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