TTEC 4852 Marine Business Practice

Business Requirements: (general business)

Consumer Guarantees Act:

Fair Trading Act:

 

Industry Rules, Regulations and Legislations: (Marine industry)

Health and safety Employment:

Council By-Laws:

Dangerous Goods:

Equipment Certification:

 

Trailer Service Regulations: (Marine trailers)

Land transport riles and regulations:

Traffic regulations:

 

Your assignment requires you to:

Access all above information from whatever source suits you.

The information DOES NOT have to be in your own words but MUST BE as it is written in the official document or information.

You may not download the information as you see fit, but it MUST ALL be in the same FONT etc.

You must put all the relevant information under the headings above, i.e: Business requirements etc.

You must provide all references as to where you accessed the information, I.e: websites etc

The assignment must have a cover page.

The assignment must have a contents page.

The assignment must be bound (not in a ring binder etc)

Gearbox work

  

(image from: http://hyperlogos.org/files/images/78_large.jpg )

1. What type of gears are used for reverse in a manual gearbox?

the type of gear used for reveres is a normal cross cut toothed gear, this allows the reverse idler gear to be positioned easily with the reverse gears on the output shaft and layshaft without the teeth grinding and stripping.Although the teeth are cross cut, there still is grinding when the three gears meet to mesh as the output shaft will still be spinning, when the reverse idler is pushed in to mesh with the output shaft, there is load as the layshaft is suddenly forced to spin the opposite direction.

2. What type of gears are used for all forward gears in a manual gear box?

With the forward driving gears, helical type are used, this means that the gears are diagonally cut, so that the gear has more surface area to mesh with othee gears other than a cross cut gear. This allows the gears to mesh easily without any whining noise like what the reverse gears make.

3. What is the purpose of a synchromesh unit?

A baulk-ring type of synchromesh unit is commonly used to synchronize the speeds of two gears before engagement. When the synchronizer is assembled, the hub is splined to the main shaft, and the engagement sleeve is splinted to the hub. The syncro ring, with recesses to accommodate the ends of the inserts, is located in each end of the hub, and a conical inner surface faces a matching steel cone on the gear.

(info from: http://moodle.student.cnwl.ac.uk/moodledata_shared/cdx%20etextbook/dswmedia/trans/clutchMan/gearLayOp/baulkring.html )

4. what type of bearings do we find in gearboxes

For the first gear, a caged roller bearing is used, as this gear is a high tension taking gear, the rest of the gears use grooves cut into the output shaft and run on a film of oil. This is because they don’t need to take as much load as 1st gear and are designed to spin at higher rpm’s than 1st gear.

5. Give and explanation of a gear ratio

If there are two gears both the same size with equal amount of teeth meshing, the gearing ratio will be 1:1 (1 to1) if however there are two gears at different sizes, (e.g, the driver gear small than the driven gear) than the ratio will be different. the way to work out ratios is simple as seen bellow:

How to get a gear ratio:

Count the amount of teeth in each gear and record weather it is the driver gear or driven gear like so (note, when you have the fraction of teeth from the input, use that as the start of each equation and multiply it by the other fractions you get from the gears*:

Then go to another set of meshed gears on the layshaft and out put shaft and count their teeth and record whether it is the driver or driven gear as stated above: 

Then multiply the two fractions as seen in the fist picture above:

Gearbox study

1. What type of gears are used for reverse in a manual gearbox?

a) give an explanation for your choice

2. What type of gears are used for all forward gears in a manual gear box?

a) give an explanation for your choice

3. What is the purpose of a synchromesh unit?

a) explain the operation of a synchromesh unit

b) what is the purpose of a Baulk/syncro ring

c) how do you check the baulk ring?

4. what type of bearings do we find in gearboxes

5. Give and explanation of a gear ratio

Valve timing

By: Ali, Alex, and Gareth

 

In four-stroke, and some two-stroke cycle engines, the valve timing is controlled by the camshaft, and can be varied by the cam lobes being modified slightly, or it can be varied during engine operation by the relatively new technology of variable valve timing.

An example of valve timing:

 

It is also affected by the adjustment of the valve mechanism, and particularly by the tappet clearance, although, this variation is normally unwanted. In many two-stroke engines, there are no camshafts or valves, and the port timing can only be varied by machining the ports and/or modifying the piston skirt, unlike supercharged two-stroke diesel engines. These engines have a cylinder head and camshaft similar to a four-stroke engine. 

A video explaining 4 stroke and 2 stroke engines

A two stroke Diesel cycle:

Why valve timing is important and valve overlap:

Valve overlap is the transition between the exhaust and inlet strokes and is a practical necessity for the efficient running of any internal combustion engine. It is necessary to begin opening the inlet valve before the piston reaches Top Dead Centre (TDC) on the exhaust stroke. Likewise, in order to effectively remove all of the combustion gases, the exhaust valve remains open until after TDC. Thus, there is a point in each full cycle when both exhaust and inlet valves are open.

New assignment info

A boat choice meeting the following requirements:
Length: 9 meter to 13 meters (30-40ft)
Hull design: Mono or Multi planning type
Components to be installed in the boat:
Engine(s): Single/multi inboard or out board. (If 2 engines are being installed, they MUST add up to 500Hp)
Engine mounting systems: How the engine(s) will be mounted/installed and strengthening required as necessary
Exhaust system: If the engine is an inboard
Cooling system: If the engine is an inboard
Raw water system: If required
Propulsion system: Shaft drive, Stern leg, Surface drive, Jet unit etc
Transmission: This will be of your choice and will depend on the propulsion system and engine choice
Drive Train: This will be of your choice and will also depend on your propulsion system and engine choice. Thrust bearings if required.
Steering system: Type and installation details, including rudder details if necessary
Fuel system: Type and installation details, including pipe-work and filtration system(s)
Corrosion system: System(s) for protection of all metal components.
Control system: Including steering, instrumentation etc
Battery system: Including an auxiliary back up system
Electrical system: Including charging, lighting (interior and navigation),entertainment etc
Deck wash: Salt water system for general wash down purposes
Safety equipment: Including engine room, general for the safe running of the boat
Auxiliary drive: Only required if main power is a single engine.
Galley: Must include the following:
. Hot and cold water
. Cooking system\
. Fridge
Bathroom: Must include a toilet and basin
Tanks: Fuel. fresh water, and grey water

The boat design is of your choice but must include the following information.
Your assignment requires you to:
. Design an installation event using the above given set of parameters.
. I identify and describe issues affecting component compatibility.
. Work out the impact of the installation on boat trim and balance.
. Use a set of boat plan line drawings and fit your chosen system into it
Your assignment must include:
. A written explanation of the installation event
. A written description of issues affecting component compatibility
. A drawing of the engine mounting and strengthening requirements
. A schematic drawing of the raw water cooling system
. A schematic drawing of the fresh water and grey water system

More inspiration

So, I got  a rough idea on what i want for my boat. here’s the link: http://www.quantumboats.com/flybridge_gallery.html
And as far as engines go… I’m getting mine from here:
http://www.steyr-motors.com/marine/
All that’s left to look for now is the rest of the items wanted.

How inspirational…

Just been looking through some boats and other places for the updated project…. and i found some boats that helped a little with size differences and proportioning and designs. It’s all really interesting.

(just a random side note, I’m listening to techno as I do this :D  and I haven’t got the links for the images above)

I’ve also been to this site and found it handy: (only in my opinion)

http://www.quantumboats.com/flybridge_gallery.html