A tender should expand your cruising range, not complicate your time at anchor. Too often, owners buy a tender based strictly on how many people it seats, only to find it overloads their crane or monopolizes usable deck space. Others choose a featherweight package that fits the boat deck easily but leaves the crew soaked and underpowered when crossing a choppy sound.
Balancing on-water utility against lifting and storage constraints requires looking at the tender and davit as an integrated mechanical system. Sizing one without calculating the realities of the other always produces compromises you feel every time you launch.
Define What the Tender Must Carry Afloat
Start with your mission on the water before looking at crane capacities or deck chocks. A tender that cannot handle your daily cruising reality will quickly become a source of frustration, regardless of how neatly it stows.
Begin by establishing your true afloat payload:
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Passenger capacity: Count the actual bodies you regularly transport, including guests, children, and pets.
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Provisions and payload: Running to an out-island dock for groceries, fuel jugs, dive tanks, or shore gear demands real carrying capacity and reserve buoyancy.
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Operating conditions: Consider the tender’s intended waters, carrying limits and crew comfort. A hull style or larger tube does not guarantee a dry or suitable ride in a particular wind speed.
Never rely on generic length designations. A 10-foot rigid inflatable boat (RIB) from one builder might carry an open deck and a tiller steer rated for four people, while another 10-foot model carries a fiberglass console, double bench seat, and deep forward locker rated for significantly more weight. Always consult the manufacturer’s capacity plate and official manual for maximum persons, total payload, and horsepower ratings. Establish the minimum hull volume and layout that satisfies your afloat utility first. That baseline dictates the weight you must ultimately store and hoist.
Calculate the Ready-to-Lift Weight
The most common planning error is conflating a tender’s advertised dry weight with its suspended weight on the davit cable. Davit manufacturers rate their cranes for total suspended load. Exceeding that rating strains hydraulic seals, winches, and deck structures.
The dry hull weight listed on a sales brochure rarely reflects the tender ready to hoist. You must calculate the complete ready-to-lift package by tallying every component that stays aboard when the boat leaves the water:
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Bare hull dry weight: As published by the manufacturer.
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Outboard engine: Include the engine wet weight (with engine oil and gearcase lubricant), propeller, and steering hardware.
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Fuel system: Include the tank and the fuel that remains aboard.
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Electrical systems: Include batteries, cables and installed accessories.
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Retained gear: Include consoles, pumps, safety equipment, lifting equipment and other items that remain in the tender.
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Water: Check for retained water and determine the actual ready-to-lift condition.
Use reliable component figures or a suitable weighing method rather than an assumed increase over brochure weight. Do not double-count parts already included in a supplied package. Distinguish the tender’s afloat payload from the complete suspended load; both need their own capacity check.
Fit Reach, Height, and Deck Storage Together
Read the capacity for the exact davit and approved configuration. Do not assume every position or optional extension retains the same rating.
The MarQuipt MarQ8 provides an illustrative example: it advertises an 800-pound capacity and five operating positions with different height and reach combinations. MarQuipt’s boom-extension guidance explains that added reach can trade off against lifting capacity. The limits depend on the model and extension; these examples do not identify the davit installed on a North Pacific yacht.
You must also resolve where the tender lives on the yacht. Trawlers generally accommodate tender storage in one of two places: the swim platform or the upper boat deck. Each involves different geometry, structural demands, and handling characteristics.
| Planning factor | Swim-platform arrangement | Upper-deck arrangement |
|---|---|---|
| Stowage | Check stern access and the complete package footprint | Check usable deck space, chocks and circulation |
| Lift arrangement | Confirm the approved launch system and clearances | Confirm davit reach, height and launch path |
| Weight | Assess loading effects on the actual yacht | Assess structure and loading effects on the actual yacht |
| Protection underway | Review exposure and securing requirements | Review exposure and securing requirements |
| Crew use | Demonstrate boarding and handling in suitable conditions | Demonstrate controls, visibility and handling in suitable conditions |
Choose a Routine the Crew Can Manage
The mechanical capability of your crane means little if your crew cannot run the launch and retrieval cycle comfortably in a breezy anchorage. A safe tender routine relies on clear sightlines, controlled swing paths, and manageable physical effort.
Before committing to a layout, ask for a demonstration under the equipment’s instructions in suitable conditions. Observe operator visibility, access to controls, clearances, crew positions and the effort involved.
Keep people clear of suspended loads. Do not invent a tag-line or lifting-harness arrangement from a general article; use the actual tender and davit instructions and qualified guidance. Once the tender is afloat, boarding safety becomes a separate task with its own movement and footing considerations.
Verify the Complete Installation Before Purchase
A tender package is an integrated structural installation involving the yacht’s deck laminates, mechanical crane, tender chocks, and lifting points. Every link in that load chain must be verified before purchasing hardware.
Have the designer or installer verify the deck structure, davit mounting, tender chocks, securing gear and approved lifting points. Confirm that the harness and davit configuration match the complete load and that service access remains available.
On our 49 Pilothouse, we install an electric/hydraulic power luffing davit, while our 590 Pilothouse has a full-function UMT hydraulic davit. Check the exact rating, reach, tender envelope and launch arrangement for the particular boat. Neither model description alone establishes the weight or size of tender it can accommodate.
Matching your tender, davit, and deck layout ensures your tender remains an asset rather than a handling headache. If you are reviewing tender sizes, calculating suspended loads, or outfitting an upper deck for long-range cruising, talk with us about building a storage and launch system tailored to how you travel.