importance of sea trials before purchase of pre-loved boats

importance of sea trials before purchase of pre-loved boats


Call Now
importance of sea trials before purchase of pre-loved boats

importance of sea trials before purchase of pre-loved boats

As a potential buyer, the importance of conducting a sea trial on your dream boat cannot be understated.

Call us on +971 44518060 or e-mail us at [email protected]

A sea trial is a critical part of the buying process, and if properly conducted will provide substantial information on whether the purchase can go ahead or to “steer away” from the particular vessel.

We as Constellation have an in house application to provide live updates of sea trails.

It is not uncommon for sellers and brokers to offer a vessel for sea trials with the presence of the Yacht main engine OEM representative on board to conduct what is known as an engine diagnostic test, but it must be borne in mind that results thus obtained are generally technically profound to decipher and usually, a set of operating parameters by way of numbers does not paint a clear picture on the other important aspects of the particular vessels characteristics.

We as Constellation have an in-house application to provide live updates of sea trails.

The second critical part is whether to go for a sea It is not uncommon for sellers and brokers to offer a vessel for sea trials with the presence of the Yacht main engine OEM representative on board to conduct what is known as an engine diagnostic test, but it must be borne in mind that results thus obtained are generally technically profound to decipher and usually, a set of operating parameters by way of numbers does not paint a clear picture on the other important aspects of the particular vessels characteristics.

This is where engagement of a professional Yacht surveyor such as those from constellation Marine services come to the fore and offer clients an opportunity to remotely witness the immediate results of our yacht sea trial prior purchase.


 importance of sea trials before purchase of pre-loved boats

Besides the technical jargon that would generally emerge from the OEM diagnostic tools, aspects such as the structural elements of the hull, deck and overall construction, as well as highlight any faults within the boat's operating systems, in addition to engines and their cooling and exhaust systems, such as steering system, running gear and most of the installed equipment, can only be determined by the presence of an experienced surveyor overseeing the sea trial process.

A sea trial is thus a perfect opportunity to feel how the vessel operates at cruising speed, check for vibrations, practice hard turns, and experience riding in rough waters.

For new buyers, it is not always clear what they are looking for, and this is where Constellation Marine surveyors can step in and assist in highlighting various aspects that are considered worthy of the buyer’s attention.

In essence, we will enable testing of the yacht in a way that you plan to use the boat.

Our engagement will commence much before we hit the open waters, starting from preparations – that enable us to come as close to replicating ideal “real world scenarios” of a typical day on the water, such as the weight of supplies, guests, and possibly crew and much of others that can significantly impact performance of the boat that is to be tested.

If the yacht is pre-owned, it is imperative that the fitted electronics on board are pre-checked, not only for them being powered up, but also for their screen visibility, their software versions fitted to navigation instruments and the general ergonomics of the control and maneuvering systems placed at the helm station/s

We will then ensure, to the extent possible, that the boat is fully commissioned, and that all equipment applicable are on board, charged and operational.

Even prior to starting the engines, and if the design permits, we will encourage operating the throttle and shift controls to confirm smooth, easy operation and positive mechanical detents, primarily associated with pneumatic or hydraulic locks within the operating system.

Ideally, the trials will begin with cold engines, as cold starting may reveal conditions that may be unnoticed when the engines are already warmed up, such as starter issues and signs of faulty ignition and fuel supply systems.

Should the boat have multiple engines, it is prudent to start and operate each engine on idle separately, this provides a good indication on issues associated with each engine when running isolated.

During this time of idle running, we will test the charging systems, by applying a load on to the power supply units by switching on lighting, blowers, refrigerators, air conditioning units etc, to report if the alternator is supplying enough current to satisfy the load requirement.

We will then check the level of water or water mixture in the bottom bilges, and try and look for signs of oil, fuel or coolant leakages.

Heading out to open waters, it is prudent to have a visual look at the exhaust emissions during slow speed running, to determine its color which is indicative of improper fuel ignition or lubricant leakages.

In order to evaluate the overall handling characteristics, we will put the engines through a range of RPM and speeds, in different conditions, such as head and following seas, beam seas, to observe that power delivery is smooth and predictable.

In general, it is expected that in seaway, the yacht will track straight at cruising speeds, when both (if twin) engines set to the same RPM. Not doing so is an indication of steering misalignment and indication of excessive steering needed to be applied to maintain course.

At cruising speeds, we will then retract the trim tabs to observe any issues with the boats natural trim, and then open each side trim tab individually, to observe change in hull trim and heading. Ideally the response should be gradual and largely predictable.

Approaching high speeds, we will observe the bow rise as the boat approaches its plane, and the associated visibility. At this time, we will also closely watch the main engine acceleration once the throttles are fully opened, if the main engines accelerate rapidly, it is an indication of propeller slip which will be required to be investigated.

We will then bring up the engines to its upper end (without exceeding the manufacturers limits) and temperature scan the heat exchangers, oil coolers, exhaust risers and manifolds for temperature anomalies. It is recommended that the engines be run at the upper limits for no more than 2 to 3 minutes.

At this time, we will quickly run to the interiors to check for vibrations, open doors, cabinets and fixtures to check for more than normal binding or looseness. We understand all hulls flex when in seaway, but excessive clearances between panels may be an indication of abnormal hull flexing.

We will then take a look on how comfortable the interiors were during the high speed trials, from a point of view of noise and smell, it is not uncommon for inboard engine exhaust leaks to percolate within the living spaces and this may lead to general unpleasantness if not detected and fixed.

We will then perform a steering test, ideally traffic permitting, by a hard-over turn to each side. Ideally, the boat should carve cleanly and powerfully through the turn without the engine struggling to maintain speed or the propeller losing its bite on the water.

Post completion of the sea trial, a complete visual inspection of the inboard engine room compartment will be made, once again to indicate visual signs of leaks, and generally a sample of the lubricating oil will be collected, once the engines are cooled down to a temperature for us to be possible to do so.

In conclusion, we urge potential buyers to have sea trials conducted with the presence of experienced surveyors from Constellation marine, and not solely rely on the diagnostic reading from OEM representatives, as this will never provide a holistic condition of the boat during its use.

By: Capt. Vispy Dadimaster

Qualfied and Impartial Client Representation for Yacht Inspections, Yacht Condition Appraisals aim is to deliver an honest, intelligent and technical report as guidance to Yacht buyers, and lenders. We have a large team of experienced, qualified professional yacht surveyors, Engineers, Architects who offer worldwide service as well as valuable insight for yachts purchase working with owner or yacht buyers to suit requirement, timelines and reporting prompt requirements. Constellation Yacht Surveyors offer bespoke surveying requirements for high value super, Yacht, and pleasure crafts, with an informed and technical submission that your dream boat is a sensible financial Yacht Registration, Boat Structures And Engines, Yacht Inspection, yacht surveyors dubai, yacht surveyors abu dhabi, survey companies, survey report, boat surveyor, boat inspection, yacht services in dubai, yacht services llc, yacht dubai marina, yacht rental dubai, yacht for sale, yacht master, yacht rental abu dhabi, yacht dubai, yacht abu dhabi, a yacht sailing, yacht bay, yacht bay marina, yacht broker, yacht club, yacht charter, yacht club dubai, yacht charter dubai, yacht crew jobs, yacht captain jobs, yacht cruise dubai, yacht dubai marina, yacht dubai rent, yacht deals dubai, yacht dubai price, yacht engineer jobs, yacht engineer, yacht for sale dubai, yacht for rent, yachting, yacht hire, yacht in dubai, yacht jobs, yacht jobs dubai, yacht jobs in uae, yacht jobs middle east, yacht jobs in abu dhabi, yacht marina, yacht price, luxury yacht dubai, luxury yacht abu dhabi, marine yacht surveyors, yacht Yacht Condition Appraisals surveyor qualifications, yacht quantity surveyor, global yacht & ship surveyors, yacht paint surveyors, luxurious yachts, luxury yacht price, luxury yacht cost, survey, survivor, marine surveyor, surveying engineering, Qualfied and Impartial Client Representation for Yacht Inspections, Yacht Management, Yacht Marine & Yacht to Yacht buyers, and lenders. We have a large team of experienced, qualified professional yacht surveyors, Engineers, Architects who offer offer building yachts for sale in Dubai. yacht buyers to suit requirement, timelines and reporting prompt requirements. Constellation Yacht Surveyors offer bespoke surveying requirements for high value super, Yacht, and pleasure crafts, with an informed and technical submission that your dream boat is a Yacht Condition Appraisals. Yacht Registration, Boat Structures And Engines, Yacht Inspection, yacht surveyors dubai, yacht surveyors abu dhabi, survey companies, survey report, survey, survivor, marine surveyor, surveying engineering, Qualfied and Impartial Yacht Inspections, Yacht Management, Yacht Sale & Purchase Inspections technical report as guidance to Yacht buyers, and lenders. We have a large team of experienced, qualified professional yacht surveyors, Engineers, Architects who offer worldwide service as well as valuable insight for yachts purchase and registration needed in UAE. buyers to suit requirement, timelines and and technical submission that your dream boat is a sensible financial proposition or a tub conditions and economies. Yacht Registration, Boat Structures And Engines, Yacht Inspection, yacht surveyors dubai, yacht surveyors engineering,