PVOL paper 1 Flashcards
Does the rudder on a conventional powerboat (with propeller forward of the rudder) have any effect when the boat is not moving through the water if:
The engine is in neutral?
So with engine neutral and no boat movement there is no steering.
Does the rudder on a conventional powerboat (with propeller forward of the rudder) have any effect when the boat is not moving through the water if:
The engine is put ahead (but the boat has not started to move yet)?
As soon as prop wash/ water is moving past the rudder, steering can begin.
Does the rudder on a conventional powerboat (with propeller forward of the rudder) have any effect when the boat is not moving through the water if:
The engine is put astern (but the boat has not started to move yet)?
Close to no steering as the water will not flow over the rudder before the boat starts moving as the prop was is moving towards the bow as you are going astern.
Is the steering system on a boat with an outboard engine or stern drive system effective if:
The engine is in neutral and the boat is moving through the water
Extremely limited steering as you have no rudder, only directional prop wash and it is not engaged.
Is the steering system on a boat with an outboard engine or stern drive system effective if:
The engine is put ahead (but the boat has not started to move yet)?
You will have steering as the prop wash is pushing the boat in the desired direction
Is the steering system on a boat with an outboard engine or stern drive system effective if:
The engine is put astern (but the boat has not started to move yet?
You will have steering as the prop wash is pushing the boat desired direction
- Why do most twin-engined boats have outward-turning, rather than inward-turning propellers?
To counter the propeller walk / transverse trust. Inward turning propellers would fight any attempt to turn using the engines.
- Why is it dangerous to let your small powerboat get too close to a large moving vessel?
The waves generated by the large vessel can capsize you powerboat, the large vessel has limited visibility so might not be able to see you and cannot react to a potential coalition dangers. The large vessel cannot stop or turn fast.
What are the typical symptoms of an unstable vessel, ie: how will an unstable vessel behave?
The vessel will be rolling/ heaving slowly and unsteadily from side to side. The vessel can develop a heel = The boat will start leaning harder and harder to one side and eventually roll over.
What are the characteristics of a good anchorage? An “anchorage” is the place where you anchor.
Seafloor material has a good grip and reasonably flat. Good sea floor material can be firm sand, mud, clay.. sheltered from current, waves, wind and traffic. Water depth? Swinging room? Safe entrance day and night? Any obstructions on bottom?
- What day and night signals do you show at anchor on a pleasure vessel less than 15m LOA, and where do you hoist them (Rule 30)?
A round ball in the towards the bow of the boat during daytime. A single white light at a location where it can best be seen
- Charted depth is 4.5m. Calculated Height of tide is 1.2m. Your vessel’s draft is 1.5m. What water depth can you expect to have beneath your keel (the deepest part of the boat)?
Charted depth is 4.5m + Height of tide is 1.2m - Your vessel’s draft is 1.5m = 4.5+1.2-1.5 = 4.2M OK
What lights and dayshapes should be shown on a vessel engaged in fishing (not trawling) and making way?
(Rule 26)
Standard lights meaning sidelight, stern light and white mast light. As well as two all-round light in a vertical line, upper being red and lower being white. During daytime a shape consisting of two cones with apexes together in a vertical line one above the other same as the top of the western cardinalmark OK. For a vessel under 50m the all-round red over white replaces the masthead light.
What lights and dayshapes should be shown by (Rule 27):
- a power-driven vessel over 50m long Restricted in Ability to Manouevre and making way?
3 all-round lights: One red light on top, one white light in the middle and one red light in the bottom in a vertical line, where they can best be seen.
During daytime one round ball on top, one diamond in the middle and one ball in the bottom in a vertical line during day time. OK
When making way it also needs to depict sidelights, stern light as well as mast lights over 50 meters one at a higher position and one at a lower position toward the bow. OK
What lights and dayshapes should be shown by (Rule 27):
2. a power driven vessel over 50m long Not Under Command and not making way?
Two all round red light, in a vertical line, where they can best be seen. Two balls or similar shapes during day time, where they can best be seen.
Sound signals when vessels are in sight of each other - what sound signals are given by: (Rule 34)
A vessel altering course to starboard?
whistle one short blast
Sound signals when vessels are in sight of each other - what sound signals are given by: (Rule 34)
A vessel altering course to port?
whistle two short blast
Sound signals when vessels are in sight of each other - what sound signals are given by: (Rule 34)
A vessel operating astern propulsion?
whistle three short blasts
