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Tech-dat/waterproof-dat/waterproof-container-dat/waterproof-container-dat.md
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@@ -18,6 +18,10 @@ inside
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![](2025-12-06-15-28-44.png)
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+## tube seal by screw and o-ring
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+
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+![](2025-12-06-15-33-44.png)
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+
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## aluminum canister
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app-dat/RC-apps-dat/rc-Marine-vehicle-dat/rc-Marine-vehicle-dat.md
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@@ -16,4 +16,6 @@
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## ref
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+- [[fish-dat]]
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+
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- [[RC-apps-dat]]
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app-dat/RC-apps-dat/rc-Marine-vehicle-dat/rc-boat-dat/rc-boat-dat.md
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@@ -84,9 +84,20 @@ Wind power: Fans blow air, generating a recoil force that propels the hull forwa
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![](2025-12-06-15-26-26.png)
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+## propeller version 1
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+
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+![](2025-12-06-15-31-53.png)
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+
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+
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+![](2025-12-06-15-32-57.png)
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+
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+
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+
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## ref
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- [[rc-apps-dat]]
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-- [[rc-apps]] - [[rc-boat]]
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\ No newline at end of file
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+- [[rc-apps]] - [[rc-boat]]
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+
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+- [[waterproof-container-dat]]
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app-dat/RC-apps-dat/rc-aircraft-dat/motor-glider-dat/motor-glider-dat.md
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@@ -15,6 +15,14 @@
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![](2025-12-05-01-36-24.png)
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+
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+
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+## nice glider collection
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+
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+![](2025-12-06-15-40-15.png)
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+
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+
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+
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## ref
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- [[rc-aircraft-dat]] - [[materials-dat]]
materials-dat/fish-dat/fish-dat.md
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@@ -0,0 +1,45 @@
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+
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+# fish-dat
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+
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+
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+## Fish Abundance by Sea Depth
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+
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+Fish numbers and species vary significantly with ocean depth. Here’s a general distribution:
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+
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+---
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+
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+### 1. **Shallow Coastal Waters (0–50 meters)**
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+- Plenty of sunlight, relatively warm water, and high oxygen levels.
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+- Seaweeds, corals, and plankton are abundant, providing lots of food.
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+- **Fish abundance is the highest**, with diverse species, such as:
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+ - Small edible fish (sardines, anchovies)
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+ - Reef fish (clownfish, surgeonfish)
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+ - Predatory fish (bass, grouper)
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+
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+---
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+
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+### 2. **Midwater Zone (50–200 meters)**
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+- Light diminishes, fewer phytoplankton, slightly cooler water.
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+- Fish numbers remain moderate, but species diversity is lower than shallow waters.
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+- Common fish:
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+ - Sardines, mackerels, young tunas
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+ - Medium-sized predatory fish
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+
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+---
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+
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+### 3. **Deep Sea Zone (Below 200 meters)**
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+- Almost no light, high pressure, very low temperature.
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+- **Fish numbers drop significantly**, mostly species adapted to deep sea.
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+- Common fish:
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+ - Lanternfish, anglerfish
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+ - Deep-sea sharks, gulper eels
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+
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+---
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+
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+### ✅ Summary
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+- **Fish are most abundant at 0–50 meters**, especially near coasts, reefs, and estuaries.
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+
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+
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+## ref
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+
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+- [[rc-apps-dat]]
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\ No newline at end of file