An important category of marine vessels are mercury inflatable boats that are way ahead of "soft tails". Improvements instituted in these crafts render them most suitable for other uses such as diving, fishing, dinghy uses, general purpose water transportation etc. The mercury inflatable boats are characterized by solid stern surfaces or transoms, inflexible keels and flooring that aid in better navigation. In contrast with soft tails the mercury inflatable boats have outboard engine that come in several sizes and duty varying from 1 to 50 horsepower. The construction of mercury inflatable boats is based on rubberized materials like Hypalon or PVC reinforced fabrics. Other construction features include air chambers and lockable floorboard over the boat's base. Traditionally the flooring was made from quality plywood but now the use of plastics including fiberglass and aluminum is quite normal.

There are several add-ons that can be used with large mercury inflatable boats such as steering wheels, lights, windshields dodger system and the boats can be transported on trailers where more information is available on transferring your inflatable sport vessels to the shore etc. Sport vessels can be purchased at costs ranging from US$800 to over US$3000 depending on their sizes. It is advisable to make an evaluation or market survey prior to finalizing on the type, model and make of the mercury inflatable boats.

Let us look at the details of "roll up" type of mercury inflatable boats. These smaller versions do have some disadvantages attached to them and that is mainly to do with the floorboards. Smaller dinghy boats come without these boards in view of the small space allocated for storage on the main ship. Soft tails can of course be used without floorboards since they can be maneuvered quite easily however mercury inflatable boats need to have these boards as they are more a necessity than luxury. One will realize that these floorboards can be quite cumbersome when storing after deflating the boat. Space is always at a premium on yachts or small ships and one needs to manage this well.

A viable solution that incorporates an integral floorboard comes from Henshaw Inflatables Company from Somerset, UK who specialize in manufacturing the models Tinker Tramp or Tinker Traveler. The integral floorboard assembly rolls up with the mercury inflatable boats whenever deflated -- a feature making it quite akin to soft tails.

The development of integral floorboards has caught on with other suppliers as well whereby the roll-ups have now become one of the most popular selling boats in the market. A point worth noting is that though roll-ups have a great deal of popularity there are surely some disadvantages that must be pointed out to have a reasonable evaluation of the pros and cons of mercury inflatable boats. Firstly the drawbacks can be listed by looking at the cost that is around 20 percent higher than other removable floor vessels. In case of slats that are sewn on the fabric floor construction the aspect of higher drag cannot be overlooked along with its higher energy costs. These floorings can also be subjected to wear and tear and repair costs can be quite high. In spite of these problems the roll-ups have become most popular in the inflatable dinghy range. One of the noticeable models in this range is Avon 3.15 as it is robust with larger tubes and a great flooring construction. One must however make a judicious choice based on the knowledgebase around and one's own experience.

The inflatable flooring types of roll-ups are also available in the market. The models called Bombard AX + or Sevylor Voyager can range between US$200 and US$1500 and are within the purview of the typical river boat or offshore rafts and certain kayaks that find use as mercury inflatable boats. Their advantages can be enumerated in the following paragraph.

Better flotation safety is provided for boats that feature floor having independent air chambers while it also results in good insulation during colder weather. The bailing stability is much better when the inflated flooring is positioned high. This is true only if scuppers are present on the boat. Tubes on the floor are positioned in the longitudinal direction and this increases rowing performance through higher lateral resistance. Overall boat performance is always better with integral floorboards in comparison with other types.

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