Submarine Aircraft Detection
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Ah! Jetex fuse...I heard banned by the cabinet early Op Banner. But those electric ignited solid fuel rocket motors are the bees geniculates. (I might have that last bit not truly right)
To be fair, our primitive trench mortars were conceived and fired at age 8 or so.
Also the banger dropped down the bicycle seat tube, or inserted in the handlebars, of the unsuspecting.
Did the earth move?
It certainly shook up any untested descendicles!
Also the banger dropped down the bicycle seat tube, or inserted in the handlebars, of the unsuspecting.
Did the earth move?
It certainly shook up any untested descendicles!
Join Date: Jul 2006
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Barnstormer
Your impertinence is based on the unsubstantiated assumption that the sub is in straight and level trim.
See me after class
For me the fun stuff was demonstrating sublimation with Potassium Dichromate, you made your own little volcano!
And who could forget the film of Potassium being introduced to water (too violent to try for real we were advised), it blew the not insubstantial glass turine in 2!
Flooding Q in readiness
Cooch
Your impertinence is based on the unsubstantiated assumption that the sub is in straight and level trim.
See me after class
For me the fun stuff was demonstrating sublimation with Potassium Dichromate, you made your own little volcano!
And who could forget the film of Potassium being introduced to water (too violent to try for real we were advised), it blew the not insubstantial glass turine in 2!
Flooding Q in readiness
Cooch
I've asked how tall the sub was as the bottom (or lowest part) is the depth not the top, that would be very same no matter what angle the sub was at or even if it was upside down. I'd measure the depth from the lowest part of the sub in the water for the obvious reason posted by another poster. Either way your gold star was for an incorrect
answer
As for things being in straight and level trim, you are further reducing the ability to reach an answer as the question didn't state the type of aircraft or its angle or attack or roll state.............bearing in mind different aircraft have their sensors in different locations.
Ok, it's after class now. What you you think is the correct answer based on the info given in the question and your subsequent addition of an unknown variation?
I recall Maurice Venn, former RAF pilot, CCF officer and part-time geography teacher enliven a CCF Inspection "platoon assault" demo with a home produced mortar constructed of a piece of pipe at an angle to the ground, light thunderflash, inert in tube followed by second thunderflash. cue large bang. Second thunderflash sails across school field and almost ignites wooden changing room at the swimming pool. Great fun.
bearing in mind different aircraft have their sensors in different locations.
If I recall correctly, the altitude of the aircraft would be with respect to Mean Sea Level, whereas depths in nautical charts are relative to Mean High Water Springs. You would therefore have to subtract half the tidal range (at Spring tide) from your calculation.
I was blessed with a very wise Chemistry teacher, who recognised that some of us would inevitably want to play with explosives whether we were allowed to or not, and set up an after school club to enable us to do it in a slightly more controlled environment...
I don't own this space under my name. I should have leased it while I still could
Pasta, as my school was within sight of Windscale that was a given, and often entertained by the guns destined for HMS Tiger.
Langley, a bit none PC but as a 10 year old, who cares. When smoking was allowed in cinemas a group of small boys could be seen emptying bangers into the cinema ashtrays and leaving it for some unsuspecting smoker to stub his ciggy out. So somebody told me.
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If I recall correctly, the altitude of the aircraft would be with respect to Mean Sea Level, whereas depths in nautical charts are relative to Mean High Water Springs. You would therefore have to subtract half the tidal range (at Spring tide) from your calculation.
We all know of "Standard Atmosphere"..temp, pressure, lapse rate.
Just curious but is there a "Standard Sea" .. Surface temp, thermocline, water clarity, salinity, ect?
Just curious but is there a "Standard Sea" .. Surface temp, thermocline, water clarity, salinity, ect?
Last edited by albatross; 12th Oct 2016 at 16:18.
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If I recall correctly, the altitude of the aircraft would be with respect to Mean Sea Level, whereas depths in nautical charts are relative to Mean High Water Springs. You would therefore have to subtract half the tidal range (at Spring tide) from your calculation.
Well unless there are more variables given than those posed in the original question.
Height would be assumed to be above the surface and the first part of the submarine encountered is 150 feet below that surface.
Depth of ocean or state of tide matter not.
Are we not overthinking this?
Interesting discussion but we have wasted the entire exam period and haven't answered this simple question. LOL Looks like a "time trap" to me.
Now if the question gave variables such as Submarine keel to top of sail distance, Indicated altitude of the aircraft, air temp ect and the "students" had been taught how to compute and were expected to be deal with these variables..we would be off to the races.
Height would be assumed to be above the surface and the first part of the submarine encountered is 150 feet below that surface.
Depth of ocean or state of tide matter not.
Are we not overthinking this?
Interesting discussion but we have wasted the entire exam period and haven't answered this simple question. LOL Looks like a "time trap" to me.
Now if the question gave variables such as Submarine keel to top of sail distance, Indicated altitude of the aircraft, air temp ect and the "students" had been taught how to compute and were expected to be deal with these variables..we would be off to the races.
Last edited by albatross; 12th Oct 2016 at 16:57.
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Pasta: it's heights of things above water (eg bridges, cables) that are referenced to 'high water' datums such as Mean High Water Springs or Highest Astronomical Tide on a nautical chart. Depths are referenced to 'low water' datums such as Mean Lower Low Water (MLLW) or Lowest Astronomical Tide. <gets coat>
NAROBS - you have lost me there (but then I left in 1962) - but over the front door is a window that is a memorial to John Boothman, winner outright of the Schneider Trophy in 1931
That also refers to: "PLANK IS GOD"
I wonder if they meant 'Planck'?
Or were they referring to fixed wing pilots?
p.s. replace the ******** with b*l*o*g*s*p*o*t (no asterisks)
I wonder if they meant 'Planck'?
Or were they referring to fixed wing pilots?
p.s. replace the ******** with b*l*o*g*s*p*o*t (no asterisks)
Last edited by Basil; 15th Oct 2016 at 17:23.
Narobs - were the honours boards still up in the hall when you were there? If so you will have seen my name as a Cranwell entrant in 1962/5, the Sixth Form year from which we sent one each to Sandhurst, Dartmouth and Cranwell. Two of those still turn up for the annual year group reunion lunch. Dad was an Old Gayt too.
