FlyingFortress

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 😳🤣🤣

That should have read spooled up. It was known as Black Staking it

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.

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

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.

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?

I would not be pleased if part of my tolls were used to dredge your berth.

Does the thread title need changing again?🤣🤣🤣

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.

👍

That makes sense to me. 👍

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

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 😔

Thanks for the recommendation. It's now on our to do list

What's a bus?

Yeah but I think it is kind of spoiled because I don't like the type of boat in the background 🤣😂🤣

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

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

In all fairness Mr Surveyor it was not you who came in all BBB about how things descend into chaos on FB.

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.

Fair comment. But does gas exhaust deplete O2 content and increase CO ?

But you cannot get CO poisoning from a diesel exhaust. Can you?

No you are quite correct. It was me that misunderstood you Must learn not to scan read.