Tech-dat/Heat-Dissipation-dat/Heat-Dissipation-dat.md
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@@ -4,7 +4,33 @@
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- [[silicon-grease-dat]]
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+# Thermal Conductivity Comparison: 1.0 vs 2.3
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+---
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+
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+## 1. Concept of Thermal Conductivity
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+- **Thermal conductivity (k)** is usually measured in W/(m·K).
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+- **Higher k → better heat transfer** (heat moves faster).
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+- **Lower k → worse heat transfer → better insulation**.
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+
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+---
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+
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+## 2. Comparison
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+- **1.0 vs 2.3:**
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+ - 2.3 conducts heat faster than 1.0.
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+ - 1.0 has slower heat transfer, so it provides better insulation.
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+
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+---
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+
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+## 3. Air as a Reference
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+- Air: k ≈ 0.024 W/(m·K) (very low, excellent insulation).
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+- So both 1.0 and 2.3 are much higher than air.
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+
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+---
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+
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+## 4. Choosing Based on Application
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+- **Need heat dissipation → choose 2.3**
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+- **Need insulation → choose 1.0**
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## ref
Tech-dat/acturator-dat/motor-dat/servo-dat/servo-waterproof-dat.md
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+
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+# servo-waterproof-dat.md
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+
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+
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+If you want to use a **servo underwater** and keep it fully waterproof, follow these strategies:
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+
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+---
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+
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+## 1. Use a Waterproof Servo
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+- **Buy a commercially waterproof servo** (used in RC boats, submarines, cars).
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+- These servos are **internally sealed** with rubber gaskets around the motor and gears.
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+- Check the **IP rating**: IP68 is ideal for full submersion.
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+
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+---
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+
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+## 2. Encapsulation in a Waterproof Housing
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+If the servo is not inherently waterproof:
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+- **Housing:** Use a small **aluminum, plastic, or acrylic canister**.
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+- **Sealing methods:**
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+ - **O-rings** at openings (shaft, wires).
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+ - **Epoxy or silicone sealant** for gaps.
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+- **Cable entry:** Use **watertight cable glands**.
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+- **Pressure:** For deep water, the housing must resist **external water pressure** (e.g., 10 m ≈ 1 atm; 100 m ≈ 10 atm).
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+
25
+---
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+
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+## 3. Lubrication and Corrosion Protection
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+- Apply **marine grease** on gears to prevent rust.
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+- Prefer **stainless steel or plastic gears**.
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+- Avoid motors sensitive to water (like uncoated brushed motors).
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+
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+---
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+
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+## 4. Shaft and Linkage Sealing
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+- The servo horn/output shaft must exit the housing. Options:
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+ - **Magnetic coupling** to transfer motion without shaft penetration.
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+ - **Sealed rotary feedthrough** with O-ring.
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+
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+---
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+
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+## 5. Pressure Considerations
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+- At **deep depths** (>50 m), water pressure can crush the servo or housing.
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+- Housing must be **strong enough** (aluminum or thick acrylic).
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+- Calculate **wall thickness** using:
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+
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+ P=ρgh, then choose a material with a safety factor.
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+
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+✅ Tip: For shallow water RC boats or ROVs (<10 m), many servos with proper epoxy coating or silicone sealing work. For deeper submersion, you almost always need a sealed housing or a servo designed for underwater use.
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+
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+- [[silicon-grease-dat]]
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\ No newline at end of file
Tech-dat/waterproof-dat/waterproof-container-dat/2025-12-06-15-28-44.png
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Tech-dat/waterproof-dat/waterproof-container-dat/waterproof-container-dat.md
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@@ -13,6 +13,12 @@
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![](2025-12-06-14-37-54.png)
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+
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+inside
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+
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+![](2025-12-06-15-28-44.png)
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+
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+
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## aluminum canister
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- Theoretical minimum: <1 mm for a tiny cylinder.
Tech-dat/waterproof-dat/waterproof-dat.md
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- [[waterproof-sealant-dat]]
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+- [[glue-waterproof-dat]]
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## waterproof level
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app-dat/RC-apps-dat/RC-apps-dat.md
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- [[rc-marine-vehicle-dat]] - [[ROV-dat]] - [[rc-boat-dat]] - [[rc-submersible-dat]] - [[rc-submersible-tank-dat]] - [[rc-submarine-dat]]
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-
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+- [[motor-dat]] - [[servo-dat]]
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app-dat/RC-apps-dat/rc-Marine-vehicle-dat/rc-Sailboat-dat/rc-Sailboat-dat.md
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+
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+# rc-Sailboat-dat
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+
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+![](2025-12-06-15-16-25.png)
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+
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+
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+
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+![](2025-12-06-15-16-06.png)
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+
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+![](2025-12-06-15-15-19.png)
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+
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+![](2025-12-06-15-15-34.png)
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+
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+![](2025-12-06-15-15-47.png)
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+
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+
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+
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+## ref
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+
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+- [[rc-sailboat]] - [[rc-marine-vehicle]] - [[rc-apps]]
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\ No newline at end of file
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app-dat/RC-apps-dat/rc-Marine-vehicle-dat/rc-boat-dat/rc-boat-dat.md
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@@ -77,6 +77,11 @@ Wind power: Fans blow air, generating a recoil force that propels the hull forwa
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![](2025-12-04-00-30-35.png)
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+## air-propelled 2
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+
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+- [[3d-print-dat]] - [[hinge-dat]] connect blue part
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+
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+![](2025-12-06-15-26-26.png)
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app-dat/RC-apps-dat/rc-Marine-vehicle-dat/rc-submarine-dat/rc-submarine-dat.md
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# rc-submarine-dat
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+- [[RC-submersible-dat]]
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+
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+
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- [[motor-waterproof-dat]] - [[propeller-dat]]
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- [[PVC-tube-dat]]
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- [[waterproof-dat]]
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+- [[glue-dat]] - [[glue-waterproof-dat]]
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+
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+- [[waterproof-container-dat]]
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+
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+
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+
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+
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+
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## design 1
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+
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bottom [[PVC-tube-dat]] with holees to keep heavy at bottom
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top [[foam-dat]] keep light to towards up
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@@ -22,6 +34,26 @@ top [[foam-dat]] keep light to towards up
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+
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+## design 2 - 3D printed
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+
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+- [[3d-print-dat]]
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+
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+
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+
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+![](2025-12-06-15-22-06.png)
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+
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+
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+![](2025-12-06-15-22-48.png)
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+
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+![](2025-12-06-15-23-00.png)
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+
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+
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+## design 3
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+
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+![](2025-12-06-15-30-03.png)
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+
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+
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## ref
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- [[rc-submarine]] - [[rc-marine-dat]] - [[rc-apps]]
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app-dat/RC-apps-dat/rc-aircraft-dat/fixed-wing-dat/fixed-wing-dat.md
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@@ -77,6 +77,16 @@ standard toy fixed wing
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![](2025-12-05-01-44-49.png)
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+## 3d printed
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+
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+- [[3d-print-dat]]
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+
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+
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+F14
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+
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+![](2025-12-06-15-24-40.png)
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+
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+![](2025-12-06-15-25-18.png)
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## tools
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## ref
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+- [[fixed-wing]]
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+
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- [[rc-apps-dat]]
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materials-dat/plastic-dat/plastic-dat.md
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@@ -3,6 +3,9 @@
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- [[Heat-Set-Insert-dat]]
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+- [[glue-waterproof-dat]]
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+
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+
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PA66: This stands for Polyamide 66, which is a type of nylon. It's a common engineering thermoplastic known for its high mechanical strength, rigidity, and excellent resistance to heat and chemicals. It's often used to make durable enclosures for electronics, some of which are designed to be waterproof.
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- [[ABS-dat]]
materials-dat/silicon-grease-dat/silicon-grease-dat.md
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- [[Heat-Dissipation-dat]]
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+- [[waterproof-sealant-dat]]
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+
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+
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## Heat-Dissipation
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11 14
Thermal Conductivity
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## ref
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68
-- [[waterproof-dat]]
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\ No newline at end of file
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+- [[waterproof-dat]]
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+
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+- [[material]] - [[silicon-grease]]
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mechanics-dat/glue-dat/glue-waterproof-dat.md
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+
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+
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+# glue-waterproof-dat.md
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+
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+- [[plastic-dat]]
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+
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+Recommended Adhesives for Waterproof Sealing
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+
9
+1. **Epoxy Resin**
10
+ - Two-part epoxy (clear or marine-grade)
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+ - Creates a **strong, waterproof bond**
12
+ - Good for ABS, PETG, PLA
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+
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+2. **Plastic Solvent Welding**
15
+ - For ABS: **acetone** melts edges and fuses pieces
16
+ - Creates a **solid, almost seamless bond**
17
+
18
+3. **Silicone Sealant**
19
+ - Food-grade or marine silicone
20
+ - Not strong structurally, but excellent for **sealing gaps and making watertight**
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+
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+
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+
24
+## ref
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+
26
+- [[waterproof-dat]]
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