Introduction
Selecting the correct size dinghy davit is essential for safe lifting, efficient operation, and long-term reliability. Choosing a system that is too small can lead to overload and wear, while an oversized system may not integrate efficiently with your boat.
This guide explains how to determine the right size based on weight, dimensions, and real-world usage conditions.
What Does “Size” Mean in a Dinghy Davit?
The size of a dinghy davit is primarily defined by its lifting capacity, but it also includes:
- Physical dimensions of the system
- Reach and lifting range
- Compatibility with the boat’s layout
Among these, capacity is the most critical factor for safety and performance
Step 1: Calculate the Total Weight
Start by identifying the total operational weight of your dinghy setup.
Include:
- Dinghy hull (dry weight)
- Outboard engine
- Fuel and fluids
- Battery and electrical components
- Accessories and onboard equipment
Example:
- Dinghy: 200 kg (441 lbs)
- Outboard engine: 60 kg (132 lbs)
- Fuel and accessories: 30 kg (66 lbs)
Total:
290 kg (639 lbs)
This total weight is the baseline for selecting the correct davit size.
Step 2: Apply a Safety Margin
Marine lifting always involves dynamic forces, so a safety margin is essential.
Recommended margin:
- Add 20–30% above total weight
Example:
- Total weight: 290 kg (639 lbs)
- Recommended capacity: 350–400 kg (772–882 lbs)
This ensures safe operation under real conditions, including movement and load shifts.
Step 3: Consider Dinghy Dimensions
Weight alone is not enough—size and shape also matter.
Evaluate:
- Length and width of the dinghy
- Lifting points and balance
- Clearance during lifting and storage
A larger dinghy may require a system with greater reach or adjusted mounting positions.
Step 4: Evaluate Installation Space
The davit must fit within the available space on your boat.
Check:
- Mounting area dimensions
- Clearance for lifting movement
- Position relative to other equipment
- Storage position when the dinghy is lifted
Limited space may influence the choice of davit type or configuration.
Step 5: Match the System to Your Usage
Different usage patterns affect sizing decisions.
Consider:
- Frequency of use (daily vs occasional)
- Type of waters (calm vs rough conditions)
- Whether multiple dinghies or loads will be handled
- Future upgrades or heavier equipment
Choosing slightly higher capacity provides flexibility over time.
Common Sizing Mistakes
- Selecting based only on dry weight
- Ignoring engine and accessories
- Not applying a safety margin
- Overlooking space and clearance requirements
- Choosing the smallest possible system to save cost
Avoiding these mistakes ensures safer and more efficient operation.
How Size Affects Performance
A correctly sized dinghy davit provides:
- Smooth and controlled lifting
- Reduced strain on mechanical components
- Longer system lifespan
- Improved safety for crew and passengers
Undersized systems may struggle under load, while properly sized systems operate efficiently.
Best Practice: When in Doubt, Size Up
If your calculation is close to a capacity limit, it is generally better to:
- Choose the next capacity level
- Allow for additional weight or upgrades
- Ensure consistent performance under varying conditions
This approach improves both safety and long-term usability.
Conclusion
Choosing the right size dinghy davit requires careful evaluation of total weight, dimensions, and installation conditions. By including all additional loads and applying a proper safety margin, you can select a system that performs reliably in real-world marine environments.
A well-sized davit not only improves safety but also ensures smooth operation and long-term durability onboard.
