Rusty the Junk - Specifications

 

Class Roberts 434 Based on the Roberts 434D but with changes to the superstructure and the rig.
Dimensions
Length Overall 13.6m Water Line 11m Beam 4.1m
Depth 1.83m Displacement design 13,330kg - our model 14,000kg
Ballast 3,000kg Air Draught 15m
Rig Junk Rigged 2 masted Schooner Total sail area 84m2
Main Mast 15m pine keel stepped Sail area 61m2
Fore Mast 10m pine hull stepped Sail area 23m2
Auxiliary Power 80hp 4 cylinder normally aspirated Ford New Holland Diesel
Gearbox PMX Hydraulic 2:1 Single Propellor with rope cutter 25 * 17
Steering hydraulic twin helm positions NACA0012 aerofoil rudder with skeg
Anchors
Main 45lb CQR 50m 3/8 chain Secondary 40lb CQR 10m 3/8 chain 50m 25mm anchorplait
Other Fishermans Recovery Electric windlass
Electrical
24V DC 80AH Engine starting recharged engine alternator
24V DC 80AH General Services including Nav Lights and inverter recharged engine alternator and windmill
12V DC 20AH General Services including VHF radio and GPS recharged 220V mains charger
220V AC Shore Power Cooking, computers, extra heating, power tools etc.
220V AC Inverter Charging 12V DC battery
Tankage
Diesel total 350lt Port 150lt
starboard 150lt day tank 50lt
Water total 300lt Port 150lt
starboard 150lt
Liferaft/Tender Bodhi 6ft Barrow Boat Sprit Boom Rig Permanent Bouyancy
Various Ratios and Values
Sail Area/Displacement 25 defines how fast or slow she may be under sail Rusty should be comparatively quick
Displacement/Length 295 defines how heavy a boat is for her length Rusty is moderate
Max Hull Speed 8kn a physical constant related to waterline length
Motion Comfort ratio 37 a measure of how comfortable she might be at sea Rusty is about normal for her size
Ballast/Displacement 28.5 a measure of a boats resistance to heeling or stiffness Rusty is surprisingly tender
Capsize screen number 1.7 a measure of ability to resist capsize Less than 2.0 is good
AVS 133.74 the angle of vanishing stability according to the latest formulae, Rusty is good for offshore ocean sailing, in all weathers