[PSUBS-MAILIST] Dry Ambient Sub

Sat Feb 17 12:16:43 EST 2018

Your design looks very interesting, Tarek, much like the SportSub line of
semi-dry ambients.

Does the buoyant force of the cockpit 950kg (2,090lb) include the occupant
who will displace the air in the cockpit with a mass similar to his volume
of water?

Do you have a buoyancy trimming system planned to add and vent air in the
trim tanks and cockpit as you descend and ascend in the water column?

What source of thrusters do you have in mind?

Tim

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org]
On Behalf Of Tarek Harb via Personal_Submersibles
Sent: Saturday, February 17, 2018 2:42 AM
To: personal_submersibles at psubs.org; personal_submersibles-request at psubs.org
Subject: [PSUBS-MAILIST] Dry Ambient Sub

Dear guys,

I would like to share with you my initial plan for the Dry Ambient sub I am
building.  I would love to hear any suggestions or comments about my
calculations.

The Dimensions of the Dry Cock pit is: width = 0.7 m, Length = 1.6 m, and
Height = 0.85 m.

This will give a total volume of: 0.952 m3.  The Cock pit will produce an
upward Buoyant force of about 950 kg (I do understand that kg is not a unit
of force, but I do this for sake of clarity).   

The total Mass of the Sub is around 850 Kg.  So in order to make sure that
the sub dive, its weight (or mass) has to be heavier than the Buoyant force
produced by the 

Cock pit, so I will add about 100 kg of Lead to compensate.

I did the calculations of the Center of Gravity and the Center of Buoyancy,
from which I obtained the MetaCentric height.  

this calculations indicated that the design will keep the sub at a stable
condition on surface and while descending, which is very important and
critical.

I can provide this calculations later on if anyone interested.

Here is a rough diagram indicating the thoughts so far

On surface

      FB                           FB                          Water level

                        Weight of all sub = 950 Kg

1= Cock Pit. Volume is 0.95 m3.

2= Main Ballast Tanks.  Volume is 0.95 m3, this will give an upward force of
950 kg assuming that the density of water is 1000 Kg/m3.

3. Trim Ballast Tanks

FB= Buoyant force = both forces will add up to cancel the weight of the sub.

At this stage all the Ballast tanks are empty and full of air.

Descending

                             FB = Buoy Force from Cock Pit

                                                                   Water
level

                       Weight = 950 Kg

At this stage, the Buoyant Force from the Pit + the Buoyant force from the
Trim Tanks will equate the downward weight of the sub.

The Main Ballast Tanks are full as the blue color indicates.  Since they are
full, they will not contribute to give upward force. 

UnderWater

FB = Buoy Force from Cock Pit      

                                                Water level

                       Weight = 950 Kg

Underwater, the Buoyant Force from the pit will equate the downward weight
of the sub, and it will maneuver using the Motors.

At a final note, the cockpit will have an exit hole at the bottom.

regards

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