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Lloyd I don't think couple of tugs could make a difference. If the ship was moving at 7 knots think about the momentum. Another thing is I don't know how long the ship was underway after leaving the port. If it was a long passage at night then fatigue sets in quickly. I remember coming to...

Tug boats are primarily used for berthing/ unberthing operations only. They operate within port limits and are known as harbour tugs. Tugs that operate in open seas for towing or salvage operation are called ocean going tugs. They are of higher power and size. Generally tugs will unberth the...

Other aspect of the story is crew factor. Commercial intrest demand reduction in crew size. Engine room crew will have 3-4 engineers (2 senior and 2 junior) and 1-2 ratings. At the time of incident the engine room will be manned by two engineers(1 senior and 1 junior)and one rating. Or the...

From my experience as a marine engineer I can contribute to "free" knowledge on internet. Ocean going ships generally have a single main engine to turn propellers. It is generally 2 stroke reversible engine running at low rpm. About 150. Aux blowers are required during starting of engine and...

I completed rear wheels for the traction engine. Instead of riveting pads on wheel as per drawing I milled out them using rotary table. I made a mistake in making them and milled both wheels in same setup. So I had to redo one wheel. I made the wheels out of sch 80 4" pipe. It was a long...

I am using them as a cheap DRO on my mill. Works okay.

Trying to build a traction engine. Based on my interpretation of Jules De Waals plan. Just finished front wheels. Regards Nikhil

We still use planimeter all the time. To calculate area under the indicator diagram for measuring power of ships main engines. Now electronic versions of power measurement are common but old planimeter is still found onboard.

Difference between First Angle Projection and Third Angle Projection : SR.NO First Angle Projection Third Angle Projection 1 The object is placed in the first quadrant. The object is placed in the third quadrant. 2 The object is placed between the plane of projection and observer. The...

Third angle projection can be visualized by “unfolding the box,” as if the object itself is being unfolded to show the views from each side. Figure 1 shows the views of a cube being represented by third angle projection. Third angle views are intuitive, as they represent you looking at the...

Hi, I don't know much about machining but making the crankcase by fabrication will be much cheaper and faster than machining it out of solid block of metal. I mean using flat bars and bolting it all together. Not aesthetically pleasing but it may do the job. regards Nikhil

Does the belt slip during normal running or only during heavy cuts? I keep the belt on my mini lathe on slack side. I can take a 1mm DOC in aluminium without the belt slipping. During parting off or grooving operation the belt slips if I feed the tool aggressively. For me a slipping belt is...

This PLAN formula can be used to calculate indicated power for any engine, external or internal combustion. Its sometime written as Pm L A N. Pm is Mean effective pressure which is defined as a hypothetical pressure, which is thought to be acting on the piston throughout the power stroke. This...

Hi, I have a question in mind. Since this is a CNC related topic I will ask it here. Why do CNC setup requires stepper motors and ball screws with minimal backlash? My thinking is that if we can get position feedback from DRO to motor driver the setup will be backlash free. And you could use...

Hi, I have a PM research #1 horizontal and #5 vertical engines. Yes you are right. I will start with low pressure boilers first. I was thinking a 3 bar boiler. But after Steamchicks calculations I think a 2 bar boiler will be much safer. regards Nikhil

Hi, Thanks for the calculations. I guess I will have to buy a 3mm copper plate and form end plates. One more thing to learn. Regards Nikhil

Hello, I am going through other sites on internet for information. What I could gleen from them is " A coal fired boiler produces a hot Sulphur bearing atmosphere that destroys joints made with copper phosphorus alloys.". So I think phoscopper rods are not used on steam locomotive boilers...

Hi, I read somewhere that rods with phosphorous should not be used for boiler construction. Then I read somewhere that these same rods were used in earlier boiler construction before advent of silver brazing. Then I read somewhere that brass should not be used due to de zincification. But I...

Hi, I am looking at many boiler designs. Mainly from www.modelengeeringwebsite.com. It has many boiler projects, independent or as a part of some other model. I am leaning towards Stuart like horizontal boiler with water tubes beneath the boiler for extra heat transfer. I was thinking of buying...

Hello, Thanks for all the suggestions. I have a 2.5"/ 65mm pipe gauge 16 or 1.6mm thick pipe. So that's the size of my boiler. It will be an all copper construction. I think I will do some practice soldering with the blue rod and my butane torch. If I am not successful I will approach a...