Boat Travelling Upstream And Downstream Dog
08.10.2020
Forgot your password? Or sign in with one of these services. While gently pottering up and boat travelling Boat Travelling Upstream And Downstream Dog upstream and downstream dog the Thames this summer, a couple of vital questions kept coming back to my mind.
My attempts to come up with a definitive answer failed every time, perhaps people here can do better? Firstly, Travelling Upstream Dog Boat Downstream And what is the most economical speed for travelling upstream?
Suppose for example the river is flowing at 3mph:. Now, Boat Travelling Upstream And Downstream Dog given that the rate of fuel consumption varies I think with the cube of your speed through the water, but the length of time for which you use it at that rate is inverseley proportional to your speed relative Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog to the land, what is the best cruising speed for a river which is flowing at 1, 2, 3, Boat Travelling Upstream And Downstream Dog or 4 mph? Secondly, when travelling downstream, when should you take the inside line which is shorter round a corner, and when should you take the outside line which will give the greatest assistance from the current which is always faster round the boat travelling upstream and downstream dog of a bend?
I assume this depends on the Boat Travelling Upstream And Downstream Dog speed of the river and the speed of the boat, and also on the geometry of the bend, but to what extent assuming of course that the river is fairly wide. If you take the inside line you Boat Travelling Upstream And Downstream Dog are more likely to run aground. If you take the outside, you will be on the wrong side of the river.
Stay in the middle, or just off centre. If the river is tidal then you will need to factor in the state of the tide to the equation too inside or outside of a bend might put you on a sand bank! Given the variation in the amount of fresh that might be on a river the most economical speed will also vary and whether you are heading upstream or downstream will make a difference to how slow you can go! I think you're overthinking this economy thing.
If you're travelling upstream, try to do so when the flow is gentle and then bite the bullet. Most important is that your engine and it's cooling system is up to the job to make your journey safe. Fuel economy is a secondary concern in my book, as we're not talking the Amazon here, just short English river navigations. What I tend to do is set revs at which my engine is happy and my progress is sensible then Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog enjoy the cruise.
Flow is generally strongest mid stream, so boat travelling upstream and downstream dog possible keep right within the confines of depth and safe navigation and you'll be against a lesser flow. Don't cut those inside bends as Rusty said above, as that's usually less depth and you'll also be rounding a blind bend.
If you're taking the Thames as a model. In normal conditions the flow runs at 1 Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog to 1. For both of these the EA advise NBs not to cruise - usually because boat travelling upstream and downstream dog boat is underpowered and unable to manoeuvre.
Going downstream, the most economical arrangement in fuel, if Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog not repairs is to turn-off the engine. It doesn't matter which line you take on the bends. To answer the upstream question, you would need to be clear whether the rate of fuel consumption that increases with the Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog cube of the speed is by time or by distance.
I think this rule-of-thumb is usually taken to be Travelling And Upstream Downstream Boat Dog by time. Going boat travelling upstream and downstream dog, the speed must be greater than the current to make progress. Increasing speed will increase the hourly consumption but shorten the journey time. If the current is 2 Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog knots and you increase the speed through the water from 3 knots to 5 knots you will increase ground speed from 1 knot to 3 knots so journey time will be reduced by a factor of 3.
So the optimum speed must be less than. Of course, increasing speed in calm water always causes costs to rise. Going upstream, there will be an optimum speed and a formula could be written boat travelling upstream and downstream dog calculate it, but life is too short!
In normal conditions the boat travelling upstream and downstream dog runs at Upstream Boat Downstream Dog And Travelling 1 1. I don't think the Thames even in normal conditions runs at Not much chance boat travelling Boat Travelling Upstream And Downstream Dog upstream and downstream dog a narrow boat going upstream. I think you really meant 1. I would have thought travel through the water at a speed that the boat is comfortable at, likely to be 4 to 5mph in a NB.
If you are going upstream you will travel over the ground a bit slower and if going down you will be a boat travelling upstream and downstream dog faster. If the current is up at 3mph or more your main consideration would be safety not economy but you would certainly have to be careful not to overheat your engine and that depends on your individual boat so as others have said I read old goat'Boat Travelling Upstream And Downstream Dog And Upstream Dog Boat Travelling Downstream Boat Downstream Upstream Travelling Dog And s "1 1.
It was a bit less of a leap than removing the space to read it as an unfeasible I was only teasing. Boat travelling upstream and downstream dog fairly sure it is the consumption per unit time that increases with the cube of the speed I think, and that ignores the Boat Upstream And Downstream Questions Meaning fact that even Boat Travelling Upstream And Downstream Dog at tickover in neutral some fuel is consumed - but by drawing some graphs I make it that the Boat Travelling Upstream And Downstream Dog And Upstream Downstream Boat Dog Travelling most economical speed is about 1.
So if the current is 2mph the best speed is 3mph, if it is Boat Travelling Upstream And Downstream Dog 3mph the best is 4. Of course not only may I have got it wrong, but also when cruising Upstream Travelling Downstream And Boat Dog the river during the summer I had neither the time nor inclination to use pen, paper, and Excel spreadsheet! For Upstream Travelling Dog Boat Downstream And me its easy on boat travelling upstream and downstream dog Thames. I did forget which way I was Dog And Travelling Downstream Upstream Boat Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog going and ran rpm downstream and got warned by the EA.
Some of us really are over thinking this! Getting too technical for me, I'm off to another topic. Slower is always better unless you want to incorporate standing costs as in charter agreements.
When you include fixed costs like crew wages, it's fairly easy to Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog prove that the most economical speed is that at which your in-port costs are doubled. For too technical read Boat Travelling Upstream And Downstream Dog over thinking! Boating is supposed to be a leisure experience. Enjoy it and stop over analysing- it's supposed to be fun!
Some of us boat travelling upstream and downstream dog a good technical discussion fun. You could always go and look at Facebook or Twitter if you want to. I can't make the graphs look good on boat travelling upstream and downstream dog but looking at the table it looks as if the least diesel always occurs where I have highlighted is always with the boat speed around 1.
But what are the figures Boat Travelling Upstream And Downstream Dog in green? Total fuel for the journey, fuel per mile, fuel per hour? Cant have an absolute value as dont know the value of K. Sorry, every figure in the table is the cost per unit distance.
Thus Boat Travelling Upstream And Downstream Dog every row represents the cost for a given journey, for that river speed, at different boat speeds. The figures in green are where I have manually highlighted the lowest figure in that row. Looking to see where they occur, they are always where the boat speed column is about 1.
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Best speed and course on a river. Prev 1 2 3 Next Page 1 of 3. Featured Posts. Keeping Up Posted December 13, Boat Travelling Upstream And Downstream Dog Posted December 13, Suppose for example the river is flowing at 3mph: if you travel through the water at 2mph you will be going backwards relative to the land if you travel at 3mph you will use a Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog bit more fuel but at least you'll be standing still at 4mph you will be using a lot more Boat Travelling Upstream And Downstream Dog fuel but at least you are making 1mph progress at 5mph you will be using lots and lots more fuel but you'll have doubled your land speed to 2mph and so on.
There you are - two problems in one post! Now, what about some answers? Link to post Share on other sites. Posted December 13, Boat And Upstream Downstream Dog Travelling Boat Travelling Upstream And Downstream Dog edited. Alan de Enfield Posted December 13, Suppose for example the river is flowing at 3mph: if Upstream Downstream River Boat Problems 2020 you travel Boat Travelling Upstream And Downstream Dog through the water at 2mph you will be going backwards relative to the land If you want to go back to where you were yesterday, do this speed.
Far too many variables for one definitive answer I think. Sea Boat Travelling Upstream And Downstream Dog Boat Travelling Upstream And Downstream Dog Dog Posted December 13, Hope that helps. OldGoat Posted December 13, So your calculations are of little boat travelling Boat Travelling Upstream And Downstream Dog upstream and downstream dog as you should be stationary Tacet Posted December 13, Flyboy Posted December 13, I think he meant one, one-and-a-half mph.
NickF 91 Posted December 13, Loddon Posted December 13,
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