Navy back to Sextant

[Steamchick]

Chazz: I was a Midshipman on a small inshore defence vessel - on the foredeck - supervising mooring lines - when there was a cry from the bridge "Emergency!! Let go all forrard"!!"
The manoeuvring engine single screw had cavitated due to an emergency change from Ahead to Astern. - This caused a "backed to starboard! " event - as you also experienced. I was told afterwards it was natural due to the density of air and water when cavitating, when a large quantity of air is "gulped-down" to the bottom of the screw, and the cavitation therefore causes reverse "paddle wheel" side thrust.
Not being quick enough, the Mid on one mooring rope (fore-spring) left it cleated, whereby the momentum of the ship simply snapped the 2 inch rope like rotten cotton! As the broken end whipped back it destroyed the hand-rails along the side of the foredeck.
Cavitation can cause a loss of control or response to the telegraph, so the telegraphist must always take care with his instructions and timing to the engine room... ALWAYS STOP-PAUSE - between Ahead and Astern. The Bridge MUST understand how the ship will respond to their instructions.
K2

 

[SmithDoor]

Chazz: I was a Midshipman on a small inshore defence vessel - on the foredeck - supervising mooring lines - when there was a cry from the bridge "Emergency!! Let go all forrard"!!"
The manoeuvring engine single screw had cavitated due to an emergency change from Ahead to Astern. - This caused a "backed to starboard! " event - as you also experienced. I was told afterwards it was natural due to the density of air and water when cavitating, when a large quantity of air is "gulped-down" to the bottom of the screw, and the cavitation therefore causes reverse "paddle wheel" side thrust.
Not being quick enough, the Mid on one mooring rope (fore-spring) left it cleated, whereby the momentum of the ship simply snapped the 2 inch rope like rotten cotton! As the broken end whipped back it destroyed the hand-rails along the side of the foredeck.
Cavitation can cause a loss of control or response to the telegraph, so the telegraphist must always take care with his instructions and timing to the engine room... ALWAYS STOP-PAUSE - between Ahead and Astern. The Bridge MUST understand how the ship will respond to their instructions.
K2

Building a engine Engine Telegraph would be fun project. The ones look a was electric control.

I pick a navy engine off a small boat by the size.
It was nice engine to rebuild.

The interesting part is control on was engine. You think navy would run a direct control to the bridge. Like the B29 had right beside the pilot all 4 engines. I have wounder how many ships would have been saved with direct controls. I told that rudder was same move need that told guy below to turn the ship.


Different Position on Engine Telegraph
Ahead Direction Movements:

Navigation full
Full Ahead
Half Ahead
Slow Ahead
Dead Slow Ahead
Stop


Astern direction movements:

Dead slow astern
Slow Astern
Half Astern
Full Astern
Emergency Astern


https://www.marineinsight.com/marine-navigation/the-basics-of-engine-order-telegraph/

I like see on a fighter aircraft flying like Navy ship uses.

 

[ChazzC]

Building a engine Engine Telegraph would be fun project. The ones look a was electric control.
View attachment 161483

I pick a navy engine off a small boat by the size.
It was nice engine to rebuild.

The interesting part is control on was engine. You think navy would run a direct control to the bridge. Like the B29 had right beside the pilot all 4 engines. I have wounder how many ships would have been saved with direct controls. I told that rudder was same move need that told guy below to turn the ship.


Different Position on Engine Telegraph
Ahead Direction Movements:

Navigation full
Full Ahead
Half Ahead
Slow Ahead
Dead Slow Ahead
Stop


Astern direction movements:

Dead slow astern
Slow Astern
Half Astern
Full Astern
Emergency Astern


https://www.marineinsight.com/marine-navigation/the-basics-of-engine-order-telegraph/

I like see on a fighter aircraft flying like Navy ship uses.

Engine Order Telegraph

Ships with Gas Turbines (Coast Guard Cutters and I think some USN ships) do have direct control of the engine room, but warships need systems that have multiple backups (sound powered communications between the bridge, engine room, steering control, comat information and weapons control for example).

 

[SmithDoor]

Engine Order Telegraph

Ships with Gas Turbines (Coast Guard Cutters and I think some USN ships) do have direct control of the engine room, but warships need systems that have multiple backups (sound powered communications between the bridge, engine room, steering control, comat information and weapons control for example).

Some of newer Airline liners have fly by wire similar RC uses.

The American war ships still use someone in engien room and steering rooms.

That sounds like Navy.
Like December 6 1941 use bombers to drop smoke bomb for a amying the battle guns to shoot the other side. They change that on December 8 1941. Could be no battle ships on the 7th

Dave