RE: [PSUBS-MAILIST] Height of Eyes Above Water?

[MerlinSub@t-online.de]

Hi Jens,

8.4 Minutes is plenty of time to release a torpedo for self defence and sunk the problem out of the way. 
Even 2 minutes should match ;-)

Thanks for the maths. 

I think on Eurosub size subs the 2 Minutes are a to short time to dive the boat and get into saftey depths. 
Better will be go on the deck and swing you arms and the national flag.. Or use the radio.. 

vbr Carsten



"Jens Laland" <laland@artematrix.org> schrieb:
> Emile
> 
> Thanks for the information, and this is what I am thinking about:
> 
> 
> Distance to Horizon = 2.072 * SQRT(meter above Sea Level)
> 
> For the Eurosub case, this range of vision would be:
> 
> Distance to Horizon = 2. 072 * SQRT(0.450) = 1.4 nautical miles (2.6 km)
> 
> Now, say a speed boat doing 30 knots is approaching (from below your
> horizon). So we must determine the distance when such a speed boat (being
> 1.8 m tall) is just about to appear above your horizon (as seen within
> Eurosub)
> 
> D(sb) = Distance from Horizon to Speed Boat
> 
> D(sb) = 2.072 * SQRT(1.8) = 2.8 nautical miles (5 km)
> 
> Total Distance between Eurosub and Speed Boat = 1.4 nm + 2.8 nm = 4.2 nm
> (7.8 km)
> 
> Time before Speed Boat reaches Eurosub = (4.2 nm / 30 kts) * 60 min/hr = 
> 8.4 minutes = 8 minutes and 24 seconds
> 
> Let say you are at surface within a narrow Norwegian fjord when this is
> about to occur, how long does it take to dive Eurosub (in a worst case
> scenario)?
> 
> Another, and probably more realistic scenario could very well be a speed
> boat entering the scene from an adjacent fjord, and this time the distance
> between you and the speed boat is no more than one nautical mile.
> 
> In that case you would have less than 2 minutes to dive...
> 
> Best regards,
> Jens Laland
> 
> ** In Eurosub abt. 450 mm above waterline with dome closed
> ** Dome open with Pilot standing: 1000 to 1100 mm
> 
> >** May I ask the elevation of the eyes of the sub pilot in various psub
> >** designs when surfaced?
> >** I need this to determine the actual range of vision from sub(s), which
> >** is part of a study I am doing on psubs operational parameters.
> 
> 
> 
> 
> 
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