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FlyingFortress
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Posts posted by FlyingFortress
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17 minutes ago, FlyingFortress said:
Thought it must be something like that.
Can not be good for fuel economy though.
Again at the risk of boring some people.
The CPP ( Controllable Pitch Propellor) ships that I worked on would have 2 modes of operation.
Combinators or constant speed .
Combinators were used when the ship was underway as the pitch of the prop increased so did the engine revs.
When working you need power available with no delay as in the engines spooling up so you run the engines up to max RPM and then the pitch controls could be operated without consideration.
If you went into the engine room you could actually see the engines moving on their beds as the turbo blowers spoiled up when the engines came on load.
That should have read spooled up.
It was known as Black Staking it
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4 hours ago, Cheesey69 said:
From my plant days, variable valve? Engine stays at set rpm and solenoid detects how much fluid to flow by how far control moved
A bit like a 360 digger. All or none cylinders can be very accurately controlled.
final speed by engine rpm of control movement.Thought it must be something like that.
Can not be good for fuel economy though.
Again at the risk of boring some people.
The CPP ( Controllable Pitch Propellor) ships that I worked on would have 2 modes of operation.
Combinators or constant speed .
Combinators were used when the ship was underway as the pitch of the prop increased so did the engine revs.
When working you need power available with no delay as in the engines spooling up so you run the engines up to max RPM and then the pitch controls could be operated without consideration.
If you went into the engine room you could actually see the engines moving on their beds as the turbo blowers spoiled up when the engines came on load.
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12 minutes ago, Smoggy said:
I've always wondered if that was an option for when I'm too knackered for sea and diesel is too expensive, I'm used to twin engines and have barely driven a single engine on shaft at all.
A single of about 90hp sat transverse in mine and smaller fuel tanks would give me a mass of space for a beer cellar....
Did the control levers work the same do you know?
There were 2 fairly standard looking control levers in the pictures.
With normal single screw hydraulics the first click (clutch in) starts the prop turning then by increasing engine revs the pump gets faster and prop rotation speeds up. Virtually impossible to tell the difference to a shaft drive.
I would assume this twin screw setup works the same.
So maybe the engine senses demand and increases revs accordingly. If that is the case then a pretty sophisticated set up for a Broads Boat.
Just wondered if anyone else knew more
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35 minutes ago, CambridgeCabby said:
There was a Sancerre for sale a few years back at Jones’ St Ives which had a similar arrangement , originally it was twin engine but when they died it was refitted with a 90hp beta engine with hydraulic drive to two props , apparently very successfully.
Interesting 🤔
So not unheard of then.
Would the engine have to run at constant RPM to supply Sufficient pressure for the varying demand? Such as turning short round it has always, in my experience required more power on the astern engine than the ahead one if you don't want the vessel to gather headway.
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A friend has just sent me a link to a boat for sale that is the same as his.
The point of the link was just how much it was up for compared to what he paid for his earlier this year.
The strange thing was that it had twin screws running off a single engine. Now I can see how that can work with 2 hydraulic pumps but I have never heard of it before.
Has anyone else?
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On 22/09/2022 at 20:52, BlueMoon said:
Hi all, there's been dredged long the Chet last winter and in Loddon staithe.
My question is ; how come there wasn't any dredging done where boats are moored in boat yards, knowing all & everyone was ready to pull away moored vessels for it to happen?
I would not be pleased if part of my tolls were used to dredge your berth.
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2 minutes ago, Mouldy said:
If the boat isn’t tolled and I mean if, should it be on the river, never mind occupying a wild mooring?
Does the thread title need changing again?🤣🤣🤣
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58 minutes ago, Roy said:
This could have been stopped with the flood barrier at Yarmouth if we know we are in for higher tides then it could have been closed to stop the salt water from pushing up.
This would also help some of the people that would like to get under ph bridge as this would keep the water level more stable.
Im not saying always have the barrier closed because of silting up rivers but if a barrier was built it would protect the eco system of the broads until the sea comes in over horsey but hopefully that’s a whole away ?
It looks like I have fat finger syndrome 🤔
What I meant to ask is that if there was a barrier closed at GTY would this not cause flooding in the Cobham and Southtown area of the town.
I have seen the river almost overtop at Bollard Quay Southtown and this would have caused massive damage to property and understructure. Also potentially risk to life. This was on a big Spring tide during a Northerly Gale.
Unless of course you are suggesting the barrier be at the harbour mouth, closing the port which may be acceptable these days with the demise of the offshore industry ( it would sound a death knell to what remains IMHO ) it was certainly not an option in the boom days of the industry.
I kind of assumed you meant somewhere around Haven Bridge.
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18 minutes ago, Roy said:
This could have been stopped with the flood barrier at Yarmouth if we know we are in for higher tides then it could have been closed to stop the salt water from pushing up.
This would also help some of the people that would like to get under ph bridge as this would keep the water level more stable.
Im not saying always have the barrier closed because of silting up rivers but if a barrier was built it would protect the eco system of the broads until the sea comes in over horsey but hopefully that’s a whole away ?
Genuine question as I say I simply don't know enough about this.
Would not closing the barrier not cause flooding in The Cobham and Southtown area of GT Yarmouth? A very high tide gets very close to overtopping there already. I have seen it within a few inches of coming over at Bollard Quay in the Southtown area. This would have caused massive damage to property and even loss of life potentially.
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23 minutes ago, grendel said:
threads merged
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That makes sense to me. 👍
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Request to mods.
Please merge this thread with the one Ex Surveyor has started.
I don't mind if mine is the one that disappears.
I simply don't know enough about this to comment.
My starting this thread was only in response to some people calling for a discussion on this subject.
Don't know why they could not have done it themselves
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10 minutes ago, Meantime said:
Well worth a visit, the only pain is finding a mooring as it's located in what was the old Pedro's building just behind The Ferry Inn. We moored at the Horning church mooring and walked up through the church and down Church Road to School Road, then down Ferry Road. About a mile in total.
2 x starters, 2 x mains, 1 x dessert, (you can guess who that was
) 2 x beers and a bottle of Red for less than £90.
Thanks for the info.
As usual both me and Mrs FF forgot our wedding anniversary yesterday. The only way we ever remember is when our oldest friends send us greetings. It is a standing joke 🤣
No worries about mooring as it's about time we took our classic car out for a waft as it has been sitting in the garage for the last month while we have been on the boat.
Can't see the top going down though with this forecast 😔
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Thanks for the recommendation.
It's now on our to do list
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1 minute ago, grendel said:
thats easy, dont look at the boat in the background
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What's a bus?
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2 minutes ago, ExSurveyor said:
Clever photo.
Taken before smartphones with a real camera I guess.
The problem with a smart phone is a lot of shots are grabbed, having turned it on, selected camera and then quickly shot.
I always find I take more considered shots with a camera.
The boat numbers are fine, even if it was taken yesterday because of the context and intention of the photo.
Yeah but I think it is kind of spoiled because I don't like the type of boat in the background 🤣😂🤣
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That actually is a cracking picture Meantime.
Very different as you say because it's hard to see the original subject but the reflection is clear
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There done.
If there is enough interest this will fly.
If not it will wither on the vine.
I don't know enough about it to comment and I missed the sight of dead fish as I was on the Southern Broads at the time
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In all fairness Mr Surveyor it was not you who came in all BBB about how things descend into chaos on FB.
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I know you will shoot me down as I have never been a member, or is it, a user,or even a viewer of FB other than what Mrs FF shows me sometimes funny pictures on her phone.
But I do know how toxic FB is and have had reports from friends and family of some pretty horrible goings on there.
Mrs FF is savvy enough not to get drawn into anything on there.
I also refuse to use WhatsApp LinkedIn Tik Tok or any other Social Media, in fact this platform is the only Social Media I use.
I do view a few platforms that interest me but this is the only one I am a member of.
After that bit of a ramble my point is.
If you don't like what goes on on FB , please feel free to delete your account. But please don't compare and reference what goes on FB to what goes on here.
I do have issues with the Moderation on here but as it says on the tin (T&C s ), my ball , my rules.
Also as a member since 2007 , clever me just found out how to find out that information, I have never clicked agreement to an amendment to The T&C's.
Just before clicking Send Reply, I must correct myself. I am still a member of another Broads Forum that must not be mentioned and did recently post a greeting to its owner after seeing him a couple of weeks ago after many years.
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Fair comment.
But does gas exhaust deplete O2 content and increase CO ?
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But you cannot get CO poisoning from a diesel exhaust.
Can you?
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2 minutes ago, OldBerkshireBoy said:
Im afraid you misunderstood, my belief is that now all boats are built to standards (classes) based on their intended use. So a sea going boat is built to a different standard than that of an inland river boat.
Then again I could be wrong.
No you are quite correct.
It was me that misunderstood you
Must learn not to scan read.
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) 2 x beers and a bottle of Red for less than £90.
Twin Screw From A Single Engine
in Broads Chat
Posted
I can believe that 😳
I was always a big fan of CPP until I became a pilot. The OSV's I worked on the response time from moving the levers to actually putting on the pitch was very very fast as when we needed power we needed it now. Hence the Black Stacking I mentioned above as the load came on and the blowers struggled to keep up.
When I became a pilot I found that the response time was excessive and sometimes even slower than waiting for an air start of a fixed prop. There is a different mentality in the offshore world to more conventional vessels as you are at real danger when working that close to an oil rig so the engines were seen as more consumables when the entire vessel was at risk.
With normal ships the engines themselves are better protected.
On many offshore vessels there was a function at the helm to override the automatic shutdown of an engine and run the engine to destruction if it would save the vessel.
I was warned by engineers not to expect the phone to be answered if I ever activated this 😳🤣🤣