VideoRay ROV Ballasting: Pre-Dive Weight and Trim Adjustment

The integrated payload monitoring system uses hydraulic pressure sensors combined with IMU (Inertial Measurement Unit) sensors on the arm to calculate and display per-bucket and per-vehicle weights. This dynamic material loading system ensures whole vehicle haulage vehicles are loaded to their full potential every load cycle, reducing cab clutter by displaying all payload functions on the same user interface as the 3D guidance system.

When the sum of all forces acting on a body is zero, the body is in equilibrium and will not move. Payload or cargo is the part of the UAS that gives purpose to the aircraft, as it is the reason for the operation. Payload can include cameras, merchandise, speakers, sensors. Payload can be fixed or interchangeable. Before each flight, it is essential to verify that payload is perfectly secured to the aircraft. A poorly secured payload can not only detach from the aircraft with associated risks but can also affect the UAS center of gravity, generating flight instability.

Payload configuration is a critical pre-programming step that defines the weight, center of gravity, and moment of inertia of the mounted load. The process involves using simulation software like Simichad to calculate these parameters: importing the 3D drawing, defining coordinate system orientation (Z-axis points out flange for articulated robots, upward for SCARA), setting tool origin at the flange point, calculating material density, and computing center of gravity and moment of inertia values. These parameters are then entered into robot programming software (Dra Studio) under the arm tab. Correct payload settings improve accuracy, collision detection sensitivity, duty cycle, and stability, while incorrect settings cause either slow operation (too heavy) or vibration (too light).

Additional weight (payload) can be added to a vehicle by placing objects on the vehicle body. The Magic Car plugin calculates the physics of the vehicle including any added weight. When objects are placed on the vehicle, they affect suspension compression, handling, and overall physics behavior. The plugin allows users to simulate different loading scenarios such as carrying cargo, passengers, or towing trailers.

When cargo is secured with straps in Farming Simulator, the cargo weight becomes integrated into the vehicle's total weight and center of mass. This causes the vehicle to behave as if it has additional weight distributed according to the cargo position. The physics engine recalculates the vehicle's mass properties, affecting acceleration, braking, and handling characteristics.

Syntactic foam is the only floatation material capable of withstanding the incredible pressures of the Mariana Trench. It consists of millions of hollow glass microspheres suspended in an epoxy resin paste. This material provides both the strength needed to withstand constant pressure and the low density required to maintain capsule buoyancy. Without such protection, the high pressure would cause any air-filled spaces to collapse, including lungs, and water would be forced into the body.

Deep submergence vehicles (DSVs) are constructed primarily from syntactic foam rather than metals like titanium. This special material consists of millions of tiny hollow glass spheres suspended in epoxy resin. Syntactic foam can withstand crushing pressures while providing sufficient buoyancy to allow the submersible to float back to the surface. The DSV DeepSea Challenger was 70% made of syntactic foam specifically engineered to withstand pressures over 1000 times greater than those experienced on land.

At the ocean surface, atmospheric pressure is one bar or approximately 14.7 pounds per square inch—the baseline for nearly all human technology. As you descend, pressure increases by roughly one bar for every 10 meters of depth. At 100 meters, pressure has increased 10-fold; at 1,000 meters, it is 100 times surface pressure. At Challenger Deep, pressure reaches 1,086 bars, meaning every square centimeter experiences a force equivalent to 1,860 kilograms pressing down. Under such conditions, materials do not compress uniformly—they exhibit behaviors that diverge from tested characteristics. Metals become brittle, tiny imperfections become nucleation sites for cracks, and syntactic foam glass spheres implode one by one in a slow-motion cascade that gradually robs vehicles of their ability to return to the surface.

Syntactic foam combines hollow glass micro spheres (20-200 microns) with epoxy resin for buoyancy and strength. Traditional vacuum mixing creates density variations; the Deepsea Challenger team developed a hydroclave process using water pressure during curing to compress trapped gases and create homogeneous material. Adding aramid pulp fiber dramatically improves tensile strength. The resulting foam can be machined into complex shapes up to 1200mm and ultrasound-tested for quality. Blocks are glued together for major assemblies, with dye penetration testing ensuring structural integrity. This proprietary technology enabled the lightweight syntactic structure that supports the pressure sphere while providing necessary buoyancy.

To survive at extreme ocean depths, special materials are needed. Syntactic foam is the only material that can both float and resist the pressure found in the Mariana Trench. Without this protection, human lungs would rapidly collapse, and water pressure would push liquid into mouths replacing oxygen. Vessels descending into the trench need 1,000-pound steel weights attached to ensure sinkage, connected by wires with increased corroding time of 11-13 hours.

Comprehensive pre-dive checklists encompass all working systems for submarine survival including mechanics, hydraulics, electronics, construction materials, and complete engineering capabilities. Life support systems must be verified as completely described with no alterations or malfunctions before descent.

A complete underwater mission involves multiple phases: pre-mission preparation including rigging security and equipment preparation; controlled descent with sonar monitoring and depth management; environmental hazard response including weather monitoring and course corrections; system failure management requiring emergency protocols and stabilization attempts; and final recovery operations including line securing, seal inspection, and data verification. Teams must balance mission objectives with safety protocols throughout, recognizing when conditions require aborting operations.

Dori is deployed with pre-programmed routes containing information about distance, depth, direction, and time. For example, a mission might instruct the fish to swim for 1.5 hours northward at 5 meters above the sea floor. Once the mission is complete, the fish surfaces and must be recovered. Since GPS signals are unavailable underwater, the fish must be brought to the surface and filled with a stabilizing liquid to prevent the sample from degrading during the return journey to the laboratory.

Successful underwater exploration requires comprehensive pre-dive checks including hatch security, ballast systems, trim adjustments, and life support functionality. Divers must maintain constant communication with surface support teams. Thermal readings and geothermal energy measurements guide exploration decisions. Safety protocols prioritize stability assessment over exploration risks. Visibility management through flood lights and primary illumination is critical for safe navigation. Depth monitoring and environmental awareness are essential throughout the mission.

Deep-sea submersible operations require comprehensive pre-dive checklists including depth gauge calibration, navigation system verification, life support functionality checks, and external light operational testing. The crew must verify every system before descent, as failures at depth could be fatal. The mission involved locating and retrieving a lost mapping drone from the Atacama Trench at 8,000 meters depth. The descent process involves gradual depth increases with corresponding pressure changes, requiring constant monitoring of instruments and systems. The crew's tension and focus reflect the high-stakes nature of deep-sea exploration.