GPS COMPUTER VS SEXTANT/ASTROLABE/Old ways/manual
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Bruno Mueller
Well-Known Member
Bruno Mueller
Well-Known Member
The ship, me at the control stand, dolphins crossing our course, the cargo on a mirror-smooth sea, keel water, at the sextant, bearing compass, Evening atmosphere and goodbye Dublin.
Good morning Antwerp.
Good morning Antwerp.
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Looks great set of engines .
Is the engines going to {gear box /prop} or (generator to motor w/prop)?
Is rudder control at helm or the old fashion telegraph?
Great photos of dinner swimming beside the ship too.
Like the Helmsman job today now a foot stool and a good movie and let water go by till port.
Thank you
Dave
Is the engines going to {gear box /prop} or (generator to motor w/prop)?
Is rudder control at helm or the old fashion telegraph?
Great photos of dinner swimming beside the ship too.
Like the Helmsman job today now a foot stool and a good movie and let water go by till port.
Thank you
Dave
Bruno Mueller
Well-Known Member
The engine speed is transmitted directly to the output shaft via a gearbox and a switch box for the controllable pitch propeller. The main engine always turns at the same speed during regular operation.
The rudder and engine are controlled from the bridge as standard. However, the main engine can also be started from the helm of the cheef.
Of course, the rudder can also be controlled manually from the engine room in an emergency.
When the autopilot is switched off and the boat is steered by hand, the helmsman stands in front of the small steering wheel in the centre of the helm station and monitors the position of the rudder and the course. The seat to the right of the helm is reserved for the captain. The left-hand seat is reserved for the 1st or 2nd officer of the watch or the pilot.
The rudder and engine are controlled from the bridge as standard. However, the main engine can also be started from the helm of the cheef.
Of course, the rudder can also be controlled manually from the engine room in an emergency.
When the autopilot is switched off and the boat is steered by hand, the helmsman stands in front of the small steering wheel in the centre of the helm station and monitors the position of the rudder and the course. The seat to the right of the helm is reserved for the captain. The left-hand seat is reserved for the 1st or 2nd officer of the watch or the pilot.
Bruno Mueller
Well-Known Member
When the autopilot is switched off and the boat is steered by hand, the helmsman stands in front of the small steering wheel in the centre of the helm station and monitors the position of the rudder and the course. The seat to the right of the helm is reserved for the captain. The left-hand seat is reserved for the 1st or 2nd officer of the watch or the pilot.
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The two gaugse the is rpm of the propane left I think is rudder angle.
The wheel today looks like a aircraft yoke.
Nice looking wheel all from fine wood and brass. Looks like have control of world .
Now try asking most what is RED & GREEN balls are for and is also found on aircraft in black is used for.
Dave
The wheel today looks like a aircraft yoke.
Nice looking wheel all from fine wood and brass. Looks like have control of world .
Now try asking most what is RED & GREEN balls are for and is also found on aircraft in black is used for.
Dave
Saw some of your Engine's on different post looks great.
Did do you do some Engine's out at sea?
Dave
Bruno Mueller
Well-Known Member
No, I am not a ship's engineer, nor am I a nautical officer. I have been interested in seafaring since my early youth. But I never went to sea. The pictures were taken as a passenger on a container freighter travelling from Antwerp/Netherlands to Dublin/Ireland.
Bruno Mueller
Well-Known Member
The left-hand instrument shows the position of the rudder in relation to the ship's centreline.
The right-hand instrument shows the speed of the propeller blade.
You still lucky
I only been on land only or flying. So realy on what I can read like you post and photos.
I can till most a lot aircraft. Something people like Hollywood versions better.
Dave
FYI
My great grandfather was born in Germany he move to Fresno California in 1880’s. Where my grandfather was born. He was last on the ocean
Thank you
One I saw photo of rudder control room where the guy who trun the rudder had what look like a hydraulic value and telegraph from bridge.
Dave
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Just think before the radio was invented we had radio control boat 🛥.
It like the I found out the FAX MACHINE was invented before the telegraph.
So you write a letter and send it to someone in your own hand writing before a telegraph.
Dave
Here from long long ago
Today it call Core 7 .
It has been different programs.
Everyone shows uses bow saw like us and carbide only one direction so If someone had found a very hard rock diamond they would not have a name for this rock. Just a hard rock.
They could make a hard copper tube to hold the diamond.
Like most here tried cutting a carbide insert cutting in reverse not a happy day.
They would to have same problem with diamond. A drum with a very long rope raped the drum.
Next is feed a simple bar pushing up.
Coolest a Reed from pood a lot guys spitting water on the drill maybe.
What do you think
?
Dave
Today it call Core 7 .
It has been different programs.
Everyone shows uses bow saw like us and carbide only one direction so If someone had found a very hard rock diamond they would not have a name for this rock. Just a hard rock.
They could make a hard copper tube to hold the diamond.
Like most here tried cutting a carbide insert cutting in reverse not a happy day.
They would to have same problem with diamond. A drum with a very long rope raped the drum.
Next is feed a simple bar pushing up.
Coolest a Reed from pood a lot guys spitting water on the drill maybe.
What do you think
? Dave
Marine Chronometer giving an accuracy of less than ±5 seconds per year, ( @ 35° longitude 5 seconds off is 1.18 miles @ 70° longitude 5 seconds off is 0.49 miles )
French Navy issued, 1980
Ships Marine Chronometer giving an accuracy of less than ±5 seconds per year
⸻⸻⸻⸻⸻⸻
U.S. Navy quartermaster 3rd class, practices using a sextant as part of a navigation training aboard the amphibious assault ship USS Bonhomme Richard,
3rd class, practices using a sextant as part of a navigation training aboard the amphibious assault ship
Sextants can be read accurately to within 0.1 arcminutes, so the observer's position can be determined within (theoretically) 0.1 nautical miles (185.2 meters, or about 203 yards).
Most ocean navigators, measuring from a moving platform under fair conditions, can achieve a practical accuracy of approximately 1.73 miles , 1.5 nautical miles (2.8 km) or close to 1¾ minutes, enough to navigate safely when out of sight of land or other. hazards.
Note: The US Navy is within 5 miles for most navigators in WW2 and Armey Airforce was 25 miles at night. Only best was within 1½ miles From what I have read. They also use dead reckoning so could explain the difference.
In WW2 the also used a sliderule too it is only 3 digits. The Navy did tried using a 12 foot silerule with more digits land base.
There for some Calculation for more accuracy they had book call Smoley's tables I have a FOUR COMBINED AKA 4 digit book.
I know the had a 6 digit book too.
Down size to book is slow you look up every number and then add up everything
Dave
French Navy issued, 1980
Ships Marine Chronometer giving an accuracy of less than ±5 seconds per year
French Navy issued, 1980
⸻⸻⸻⸻⸻⸻
U.S. Navy quartermaster 3rd class, practices using a sextant as part of a navigation training aboard the amphibious assault ship USS Bonhomme Richard,
3rd class, practices using a sextant as part of a navigation training aboard the amphibious assault ship
.jpg)
Sextants can be read accurately to within 0.1 arcminutes, so the observer's position can be determined within (theoretically) 0.1 nautical miles (185.2 meters, or about 203 yards).
Most ocean navigators, measuring from a moving platform under fair conditions, can achieve a practical accuracy of approximately 1.73 miles , 1.5 nautical miles (2.8 km) or close to 1¾ minutes, enough to navigate safely when out of sight of land or other. hazards.
Note: The US Navy is within 5 miles for most navigators in WW2 and Armey Airforce was 25 miles at night. Only best was within 1½ miles From what I have read. They also use dead reckoning so could explain the difference.
In WW2 the also used a sliderule too it is only 3 digits. The Navy did tried using a 12 foot silerule with more digits land base.
There for some Calculation for more accuracy they had book call Smoley's tables I have a FOUR COMBINED AKA 4 digit book.
Down size to book is slow you look up every number and then add up everything
Dave
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The calculations took time even with tables and charts.
1) To close location you need to do a dead reckoning to point where you took readings and where you after finished your calculations.
2) Then use dead reckoning till next time you would take a reading.
In Aviation has the E6B this only take few minutes.
I would think the Navy has some like the E6B for dead reckoning.
DOES ANY KNOW?
Dave
1) To close location you need to do a dead reckoning to point where you took readings and where you after finished your calculations.
2) Then use dead reckoning till next time you would take a reading.
In Aviation has the E6B this only take few minutes.
I would think the Navy has some like the E6B for dead reckoning.
DOES ANY KNOW?
Dave
