Boat Design Forums | Boat Design Directory | Boat Design Gallery | Boat Design Book Store | Thanks to Our Site Sponsors | Sitemap |
|
|||||
Page ii
|
VOLUME I
|
INTRODUCTION
|
|||
|
|||||
INTRODUCTION
This volume deals with the construction in
ferro-cement of a 65-foot (19.5 m) power boat hull for twin engines. The construction method demonstrated is the upright, welded framework method in suspension from an overhead structure.
The contents of this volume treat in proper
sequence with all the construction stages from lofting through to a hull ready to be plastered. Inevitably, for the purposes of illustrating the construction work in detail, one single design of hull had to be chosen. Prospective builders of other designs of boats within this category need not be deterred, however. The techniques demonstrated here may be safely imitated to produce other hulls of equal proven quality.
Construction Costs:
Costs of construction are what immediately
interest the prospective builder. Following the reproduction of the set of drawings from which this hull was built, a comprehensive catalogue has been included. The catalogue lists all the equipment and materials used in the yard and in the construction of the demonstration hull. It will be noted that some of the equipment and most of the tools were purchased. In those instances where equipment was required only for a short period of time it was, where possible, rented. In cases of either rental or purchase the prices are recorded as they stood in Seattle, Washington, USA, in the spring of 1972.
The costs of overheads: management, yard
material, electricity, insurance, social security, etc., have been omitted because of the wide dif- ferences in these costs from one place to another.
Labor Costs:
Labor costs also differ widely from one
region to another. For this reason estimates are given of the number of man-hours required to perform a given task by a given trade classi- fication. This information will be found in the Construction Schedule, a valuable guide which is placed immediately after the Catalogue in this Section. From these man-hour estimates (in fact, an actual record of man-hours utilized |
in the construction of the demonstration hull),
the prospective builder can calculate total labor costs according to the rates prevailing in his area.
The Manager's Check-List:
The Construction Schedule has purposes
other than a guide to labor requirements and its principal function is to serve as a form of check- list for management. Here, in condensed form, the manager has set down before him all the essen- tial information required for building the hull efficiently. For precise details on certain jobs the manager refers, by numbers of Stage, Job and Task, to the corresponding section in the text, for both text and Construction Schedule follow the same titles and sequence.
The Construction Schedule reminds the
manager when to consult the Catalogue for deliv- eries of materials and equipment. It informs him, as has been mentioned, on what types of trades- men will be required for a certain job, also, how long the job should take.
Because of printing space requirements only
a skeleton Construction Schedule is included here but, in expanded form, more space would be given for the manager's own annotations. In
the case of series production of one design of
hull the Construction Schedule would be con- stantly revised according to the performance of the work force as it gained efficiency. The basic information contained in the Construction Schedule would be submitted to an over-all, Master Construction Schedule which would pro- ject, on one sheet of paper at any one time the varying stages of production of all the boats in the yard. This was the system employed in the Bahamas in 1971 when a new boat yard was developed, men trained and ten ferro-cement vessels of one design were successfully built and launched within a five-month period. (See Volume III.) If a crisis should arise where a fleet is required in a hurry, a production schedule of this type could be effectively used on a protected beach to produce one boat complete through trials every working day. Providing space, mate- rials, labor and money were available. Details of the production method would alter but this tried and proven principle would remain the same. |
||||
|
|||||