Nick
Voyager 
Chief Engineer - Queen of Richmond
Posts: 2,080 
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Post by Nick on Dec 1, 2008 9:19:29 GMT -8
I'm not disagreeing with you about terminal noise, those people knew the terminal was there when they moved in. As far as I know, there aren't any residents left from before 1960. That said, when the noise from the terminal increases to the point that it is causing damage to your home, you have a right to complain, and BCF should do whatever they can to remedy the situation. If that is something as simple as changing the daily operations to make sure the noise takes place farther from the house, all the better for everybody.
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Post by Hardy on Dec 6, 2008 3:55:31 GMT -8
I'm interested on how the low freq noise from the "helicoptering" of the props is causing window damage. Someone care to expound on this a little for me?
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Koastal Karl
Voyager
Been on every BC Ferry now!!!!!
Posts: 7,747
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Post by Koastal Karl on Dec 6, 2008 9:50:10 GMT -8
She is replacing the SOVI starting today at 11am for two roundtrips! Guess this is a regular Saturdy thing now??
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Post by Hardy on Dec 6, 2008 14:12:34 GMT -8
Is it still familiarization, or is there something actually ailing the SoVI? With what as been presented, I would lean towards just familiarization, but there could always be something more sinister lurking beneath the surface.
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Post by Dane on Dec 6, 2008 18:06:04 GMT -8
Famil for seasonal's. Was out there again today and watched it all go down.
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Post by DENelson83 on Dec 7, 2008 2:18:25 GMT -8
I'm interested on how the low freq noise from the "helicoptering" of the props is causing window damage. Someone care to expound on this a little for me? I thought this was fixed with the installation of a muffler. |
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Post by Hardy on Dec 7, 2008 2:33:46 GMT -8
I'm interested on how the low freq noise from the "helicoptering" of the props is causing window damage. Someone care to expound on this a little for me? I thought this was fixed with the installation of a muffler. The mufflers fixed the high engine noise problem. They would not do anything at all for the "helicoptering" noise caused by the propellers churning the surface -- which I believe is what is being cited for causing the problems with regard to window damage. Probably something to do with frequency and resonance, no doubt. |
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Post by gordon on Dec 7, 2008 7:43:57 GMT -8
Are the Swartz Bay residents having the same issues with the CC as the DB residents had with the CR?
What can BCF do to remedy this prop helicoptering problem?
Have the Tsawwassen residents had the same complaints about the CI as residents near the other terminals, or is tsawwassen far enough removed form residential areas?
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Post by Hardy on Dec 7, 2008 10:43:19 GMT -8
Have the Tsawwassen residents had the same complaints about the CI as residents near the other terminals, or is tsawwassen far enough removed form residential areas? There is the Tsawwassen First Nations reserve and then their Tsatsu Shores development that are close to the terminal at Tsawwassen ... but they are still a good distance away from the terminal, and the method of construction of the terminal (out on a penninsula) makes for inherent noise reduction. |
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Post by Dane on Dec 7, 2008 12:42:42 GMT -8
Is the CC loading using the hoist, or via the car deck for stores?
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Post by gordon on Dec 7, 2008 21:16:38 GMT -8
Why is the helicoptering of the props necessary while docked, they only need to power the hotel load?
The Diesel \electric power system is always producing power' it should be pretty quick to get the actually propullsion aspect of the system going?
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Post by DENelson83 on Dec 7, 2008 22:00:37 GMT -8
Why not plug the boats into the land-side electrical distribution grid while they're docked, and then slow the propellers down so that they don't "helicopter"? Then just before the boat is scheduled to sail, bring the propellers back up to speed, make sure the on-board generators are synched to the electrical grid, unplug the boat, and away she goes?
Oh, that's right, then we'll all have to pay BCF's hydro bills.
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Post by Hardy on Dec 8, 2008 22:04:51 GMT -8
Why not plug the boats into the land-side electrical distribution grid while they're docked ... Oh, that's right, then we'll all have to pay BCF's hydro bills. I am not an expert on any of this, but would the switch over from ship power to shore power 16 times per day not put added strain on the onboard elecrtical system? Having to plug in would also another thing to check and another thing that COULD go wrong. At the end of the day, would using shore power really "save" anything per se? It may help cut down on some noise when docked, but from what I have read, isn't the main complaint the noise when DOCKING and UNDOCKING? The actual in-dock operations are only causing the shore-errosion problem, aren't they? Or am I missing something? |
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Post by DENelson83 on Dec 8, 2008 22:33:47 GMT -8
Well then, we can simply dry-dock the Super Cs one by one and replace their propellers with ones that don't cavitate and perform better than the propellers they currently have.
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Neil
Voyager
Posts: 7,309
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Post by Neil on Dec 8, 2008 22:51:01 GMT -8
Well then, we can simply dry-dock the Super Cs one by one and replace their propellers with ones that don't cavitate and perform better than the propellers they currently have. Good idea. And then the Chief Engineer can make a little road trip to Canadian Tire to pick up some really long extension cords to hook the boats up when they're in dock, and we'll have two solutions to the problem, just like that. See, they should hire this forum as consultants. We make it look easy.  |
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Post by Hardy on Dec 9, 2008 6:43:56 GMT -8
Well then, we can simply dry-dock the Super Cs one by one and replace their propellers with ones that don't cavitate and perform better than the propellers they currently have. I am pretty sure that Markus addressed this in one of his replies -- it is not as simple as just replacing the props, as they are in integral part of the propulsion system; if you switch out the designed propeller, then other components of the propulsion system will no longer be as efficient as they were designed to be. Just think about switching out the tires on your car -- you go for a smaller size with super-blingy rims -- now your spedometer is no longer calibrated properly, and due to the smaller size, your engine no longer works as efficiently to power your car. There are all sorts of spin off problems when you switch out a designed component. |
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Post by gordon on Dec 9, 2008 7:13:10 GMT -8
I thought in one of his posts Markus said that Cavitation was not the problem.
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D'Elete BC in NJ
Voyager
Dispensing gallons of useless information daily...
Posts: 1,671
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Post by D'Elete BC in NJ on Dec 9, 2008 8:10:07 GMT -8
I thought in one of his posts Markus said that Cavitation was not the problem. He did...by strict definition, the issues being seen are NOT cavitation...they are noise produced by the propeller either due to the propeller breaking the water surface, or, more likely, due to air being drawn into cavities formed by the turbulence induced by the interaction of the propeller wash with the sea floor and dock structure and hull. Subsequent collapse of the cavities and related compressing and expansion of said air is likely the cause of the thumping. But, that's just me making an educated guess. I would suspect this is why some of the terminals are more susceptible to amplifying this effect...shape of the sea floor, etc. |
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Post by DENelson83 on Dec 9, 2008 12:21:54 GMT -8
Okay, I give up. How are we going to see our beloved Super Cs get used more often?
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Post by gordon on Dec 9, 2008 13:04:49 GMT -8
On Dec20th the CR goes back into refular service on Route#2-permanently according to RBI - the CI will be back on RT #30 cc on RT#1 on a more frequent basis after that.
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Post by DENelson83 on Dec 9, 2008 13:07:02 GMT -8
Let's hope you're right, gordon...
Oh, wait, it's because it's a peak period. I meant run the CR on route 2 during off-peak periods.
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Post by Hardy on Dec 9, 2008 21:06:37 GMT -8
I thought in one of his posts Markus said that Cavitation was not the problem. As DEN also quoted, cavitation, in the definition of it's nature, is not the problem that the vessels are suffering from. Noisy operations while docked are being caused by the propeller basically drawing in air (sucking wind!), and causing "excessive" noise. Also correctly stated is that shoreline structure and terminal construction/composition as well as proximity to the nearest residences are all equal factors in determining if the noise is a problem or merely an inconvenience. |
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Post by Coastal Canuck on Dec 12, 2008 19:12:38 GMT -8
It just took the CC over 2 hours to do her crossing  |
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Post by DENelson83 on Dec 12, 2008 20:14:55 GMT -8
Bad weather? We are under a wind warning right now.
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CFG
Deckhand
I used to be indecisive. Now I'm not sure.
Posts: 64
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Post by CFG on Dec 12, 2008 20:52:53 GMT -8
It may have had to wait for berth space. The SoBC and the CR where both in port. I noticed that she was making her approach at about 10kn from around the middle of the straight, but then departed at 23kn, so I don't think weather was a factor. Do the Coastals and Spirits fit in berth 4 at Tsa?
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