Runabout build.
Following the moulded ply dinghy built last year, I now have a more sporty type of craft on the stocks that will be quicker on the water. At 12' 8" long and 4'9" beam for a 20 hp outboard motor.
The half mould 1/8th scale model was made for offsets to be taken along a centre line which is common practice.
Eleven sectional moulds are mounted along a jig. The jig is set on three support trestles with castor wheel feet to give mobility within a confined garage area. With my own design there is no instruction guide to work from and inaccuracies to the model are magnified eightfold once scaled up. Before the build can commence the truing up process has to be done and a pleasing shape will soon emerge.
Two or three layers of ply will enable compound curves in the area of the bow and stern.
Bouancy chambers will be incorporated with a bulkhead forward of the dashboard and narrow side tanks. A stern bulkhead/false transom will provide a rear buoyancy tank and a well for the outboard motor.
My ideas are taken from features of various designs, including Albatross and the rib type of craft that have strakes and spray rails along the
chines.
An outboard of 20 or 30 hp will be required to ensure that this craft will be capable of planing at approx 20 knots.
February will be taken up with fitting the keel, chines, stem and strakes onto the eleven cross section moulds. Only then shall I be at the point of laying down the ply laminations. Much like the cold moulded craft made previously, except that each of the strips will be up to twelve inches wide and approximately five mm thickness. A waterproof pva type glue is being used but for the laminating Cascamite will be used instead.
Following the moulded ply dinghy built last year, I now have a more sporty type of craft on the stocks that will be quicker on the water. At 12' 8" long and 4'9" beam for a 20 hp outboard motor.
The half mould 1/8th scale model was made for offsets to be taken along a centre line which is common practice.
Eleven sectional moulds are mounted along a jig. The jig is set on three support trestles with castor wheel feet to give mobility within a confined garage area. With my own design there is no instruction guide to work from and inaccuracies to the model are magnified eightfold once scaled up. Before the build can commence the truing up process has to be done and a pleasing shape will soon emerge.
Two or three layers of ply will enable compound curves in the area of the bow and stern.
 |
| Transom upside down on jig |
My ideas are taken from features of various designs, including Albatross and the rib type of craft that have strakes and spray rails along the
chines.
An outboard of 20 or 30 hp will be required to ensure that this craft will be capable of planing at approx 20 knots.
February will be taken up with fitting the keel, chines, stem and strakes onto the eleven cross section moulds. Only then shall I be at the point of laying down the ply laminations. Much like the cold moulded craft made previously, except that each of the strips will be up to twelve inches wide and approximately five mm thickness. A waterproof pva type glue is being used but for the laminating Cascamite will be used instead.
 |
| Stem showing bulkhead at station five which forms bouancy chamber |
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