Identify This Instrument

Ninja_Stoker

War Hero
Moderator
#2
Looks like a wind direction repeater, fitted on the arse end of frigates/destroyers, used by the FDO to advise the helicopter pilot via the wired Tele-brief so he/she knows which direction the wind is going to hit them as they lift-off, whilst underway in the lee of the ship superstructure.

If it is, there'll be a second gauge indicating relative wind-speed. The more recent ones are usually coloured red/green. I think the ship is usually steered to bring the relative wind within the graduated zones to enable take-off/recovery within safe parameters. Possibly our Woos can refute/confirm?

Then again, I'm only a Stoker so could be totally wrong.
 

sweetpea

Lantern Swinger
#3
It looks like a type of hygrometer to me. The 5T/237 printed on the dial has me thinking of something to do with Dew Point Temperature, 5T being temperature, of course, I could be way off the mark. :confused:

SP.
 
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#4
It looks like a type of hygrometer to me. The 5T/237 printed on the dial has me thinking of something to do with Dew Point Temperature, 5T being temperature, of course, I could be way off the mark. :confused:

SP.
Hygrometers wouldn't have port & starboard on them though SP..or would they?
 

sweetpea

Lantern Swinger
#6
Hygrometers wouldn't have port & starboard on them though SP..or would they?
I don't know Wrecker. Can you think of any gauges one would find on a ship or submarine that you would use to measure humidity?
Just trying to work out what the 5T 237 is, it must be a unit of measurement. I just feel it is something to do with measuring humidity, Dew Point Temperature *C.
Relative humidity %.... but I could be wrong. :confused:

SP.
 
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#7
I think Ninja may be on the right track.
The fine graduations between 30 deg Port & Starboard would be of use to the FDO when interpreting SHOLs (Ship's Helicopter Operating Limits).

Just trying to work out what the 5T 237 is,
I think that's a manufacturer's serial No.
 

sweetpea

Lantern Swinger
#8
I think Ninja may be on the right track.
The fine graduations between 30 deg Port & Starboard would be of use to the FDO when interpreting SHOLs (Ship's Helicopter Operating Limits).


I think that's a manufacturer's serial No.
Do you think so, would they stick the serial number on the front?

SP.
 
#11
manufacturers details should be on the case somewhere.

Gauges come all kinds of wonderful and weird sizes and configurations.

What I find strange about it is, it only has 30 degs on the Port side but 180 on the Starboard, so not so likely to be a wind direction repeater, could it possibly be something to do with thrusters?
 

Ninja_Stoker

War Hero
Moderator
#12
manufacturers details should be on the case somewhere.

Gauges come all kinds of wonderful and weird sizes and configurations.

What I find strange about it is, it only has 30 degs on the Port side but 180 on the Starboard, so not so likely to be a wind direction repeater, could it possibly be something to do with thrusters?
The safe operating limits, going back to my days of loafing on the flight deck as a smac233 rating, if I'm correct, usually involved getting the ship into a position where the wind was coming from green, within set parameters when veering. I think it took off with the wind coming-in within a few degrees either side of the ships' head, but if it was veering, the prefered direction was from green.

I don't know the reasons, but suspect it could be to do with the rotor direction of rotation or which side of the helicopter the pilot was sitting or which way you needed to face Mecca.

Thinking about it still further, it could be off a carrier where you wanted wind across the deck veering from green relative to the island superstructure, otherwise the lee of the island could cause snags upon landing if you were compensating for wind and it suddenly 'turned off' or caused turbulence where you least needed it.
 
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