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“Look at my face — dark as the night —

Yet shining like the sun with loves true light.

I am the black girl who crossed the dark sea

Carrying in my body the seed of the free.”

The Negro Mother - Langston Hughes

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IG: maxfordanger 🤎

#yemaya #shallowwater #shallow waters #black privilege publishing #haitian #dark skin #BLACK WOMAN #maxfordanger

morE tHan we can evEr learn frOm boOks. #Fish #Fishing #BlueLagoon #deepsea #shallowwater #amigos #beach #localstyle #islandlife #olhukolhu #Dharanboodhoo #Maldives (at Olhukolhu) https://www.instagram.com/p/BqLD552HPNR/?utm_source=ig_tumblr_share&igshid=eff44jalslk7

#fish #fishing #bluelagoon #deepsea #shallowwater #amigos #beach #localstyle #islandlife #olhukolhu #dharanboodhoo #maldives

Cabezon couldn’t resist the warbait head and MC swimbaits... love shallow water rock fishing #warbait #mcswimbaits #fishing #hmb #norcal #shallowwater #notwishinfishin #goodtimes #ankenystreetsportfishing #rockcod #rockfish (at San Gregorio, California) https://www.instagram.com/p/BnSqQCDH47x/?utm_source=ig_tumblr_share&igshid=1kysyl3a0rw10

#warbait #mcswimbaits #fishing #hmb #norcal #shallowwater #notwishinfishin #goodtimes #ankenystreetsportfishing #rockcod #rockfish

Build Log: A Shallow-Water RC Jet Boat with 3D Printed Hull and Custom Impeller

I started this project to build a nimble RC jet boat that can handle ponds with shallow margins and river shallows while still being fast enough for fun runs, and this log documents the steps I took from CAD to maiden voyage with a focus on impeller design, shallow water running and 3D printed hull techniques.

My parts list was deliberately short to keep weight down and complexity low, consisting of a brushless motor (2S–4S compatible), a compact ESC with telemetry, a pump-jet housing I modelled in CAD, a custom impeller, battery pack, waterproof servos for trim and a 3D printed hull and bulkheads made from PETG or ASA depending on UV exposure expectations.

Impeller design was the first technical challenge and I began by deciding on a pump-jet rather than an exposed prop because the shrouded design reduces the chance of hitting riverbed debris in shallow water, and it gives better intake protection for weeds and stones. I modelled a three-blade impeller in Fusion 360 with a modest diameter to match the nozzle throat, selecting a blade chord and pitch that prioritised torque at low RPM over top-end rush, and I left a radial clearance of 0.6–1.0 mm to the stator to avoid contact while keeping efficiency acceptable. After printing in PETG I dynamically balanced the impeller on a makeshift lathe setup using tiny adhesive weights until runout was negligible and then swapped in a stiff stainless shaft and sealed the bearing housing carefully to keep grit out of the bearings.

For the hull I printed the lower shell and separate deck in vertical orientation to maximise strength along the keel, using 0.4 mm nozzle, 0.2 mm layer height and 3–4 perimeters for a watertight shell, followed by a thin epoxy coating inside all seams to make a sure seal. Bulkheads were glued with polyurethane adhesive and screwed into female bosses printed into the hull so you can remove the deck without stressing the joints, and I added a splash-proof hatch for battery access with silicone gasketed edges to ensure quick swaps and easy drainage of any residual water.

Shallow water running required some layout changes from a deep-water racer, so I moved the intake forward slightly and fitted a short debris lip to the inlet to reduce the amount of sand and grass sucked into the pump. The jet throat is intentionally smaller than a deep-water design to maintain pressure rather than raw flow so the boat will punch out of shallow patches rather than stall, and I also fitted a small anti-weed grille just ahead of the impeller intake to catch long strands while keeping flow disruption minimal. Trim tabs and a slightly higher transom helped keep the intake clear of surfactant and muck during acceleration.

Cooling the motor and ESC in a compact jet hull is tricky because you do not want open through-hulls where the water could carry debris into electronics, so I implemented a simple water-cooling circuit that takes a feed from the pump intake via a short, filtered pickup and routes it through an aluminium heat block mounted to the ESC before returning it to the cavity behind the nozzle to be expelled with the jet flow. Thermal paste, brass barbs and flexible tubing kept the connections secure and I pressure tested the circuit on the bench for leaks before the first run, and I uploaded photos, build notes and STL files to my site WatDaFeck for anyone who wants to duplicate the build or adapt the models for their own boats.

The maiden voyage taught me a lot, including better spring-loaded hatch clips for high-G turns, a slight reprofile to the nozzle lip to reduce cavitation at full throttle and a move to a slightly higher-pitch spare impeller I had on the shelf to fine-tune top speed; overall the pump-jet concept with a balanced 3D printed impeller and a sealed, epoxy-finished hull proved reliable for shallow water use and easy to maintain between sessions.

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#rc batteries #build #shallowwater #boat #printed #hull #custom #impeller #boats #stepbystep #rc planes #fpv

The Critical Role of Shallow Water Bathymetric Surveys in Coastal Development

Coastal zones and inland waterways are the most dynamic environments on the planet. Yet, ironically, they are often the least understood due to the difficulty of traditional vessel access. A bathymetric survey in shallow water (typically defined as depths from 0 to 20 meters) is the only way to obtain the high-resolution data necessary for safe navigation, habitat conservation, and resilient infrastructure.

1. The Challenge of the Nearshore Zone

Traditional hydrographic vessels often have drafts too deep to safely navigate nearshore environments, leading to data gaps known in the industry as the "white ribbon." To bridge this gap, modern hydrographic surveys for coastal engineering utilize specialized equipment such as shallow-draft jet boats, kayaks, and increasingly, Unmanned Surface Vessels (USVs). These remote-controlled platforms allow surveyors to reach hazardous or restricted areas, such as surf zones and winding riverbanks, without risking personnel.

2. High-Resolution Shallow Water Sonar Technology

Precision in shallow water requires a different acoustic approach than deep-sea surveying. Shallow water sonar technology, such as Single-Beam Echo Sounders (SBES) or specialized Multi-Beam Echo Sounders (MBES), operates at higher frequencies (typically 200 kHz to 400 kHz). This provides the sub-centimeter vertical accuracy needed for:

Dredging optimization: Ensuring channel depth for port access.

Scour monitoring: Inspecting the stability of bridge piers and jetties.

Volumetric analysis: Calculating sediment buildup in reservoirs.

3. Sub-Bottom Profiling and Sediment Analysis

Beyond just mapping the floor, many projects require "seeing" beneath it. Sub-bottom profiling for dredging uses lower-frequency sound waves that can penetrate the seabed layers. This reveals the thickness of silt, clay, and rock, allowing contractors to select the correct dredging equipment and accurately estimate project costs before mobilization.

4. Innovation: Satellite Derived Bathymetry (SDB)

In areas where water clarity allows, Satellite Derived Bathymetry (SDB) is emerging as a cost-effective alternative. By analyzing multispectral satellite imagery (like Sentinel-2), surveyors can estimate depths up to 20 meters across vast areas in a fraction of the time required for boat-based surveys. While not as precise as sonar, SDB is an invaluable tool for preliminary site assessments and monitoring rapid shoreline changes after storm events.

Conclusion: Precision Where It Matters Most

As sea levels rise and urban coastal density increases, the demand for accurate shallow water bathymetry has never been higher. Whether through autonomous robotics or satellite intelligence, understanding the underwater terrain is the first step toward building a safer, more sustainable maritime future.

#bathymetricsurvey #shallowwater #services