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A second new engine for Tanwen.
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Tony Bird


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Joined: 06 May 2010
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Location: South Wales UK

PostPosted: Sat Dec 17, 2016 6:09 pm    Post subject: A second new engine for Tanwen. Reply with quote

Hi,

In a recent post I described a controllable engine to replace the single acting oscillating engine fitted in my model paddle boat 'Tanwen'.  This engine used modified replacement cylinders.  This engine worked fine but would have been to powerful for the hull.



So it was decided to make a much smaller engine of a similar design, the cylinder size being a 1/4" bore and 1/2" stroke rather than the 3/8" bore  and 3/4" stroke of the first engine.

The engine will be based on a small engine I designed years ago, this engine can be made single or double acting with bores of 1/4" up to 1/2", most built have been 5/16" bore all had a common stroke of 1/2".



The engine's column has been made of a light gauge aluminium square tube.



The port blocks and the reversing block with its valve have been made from some large brass angle that I have and was machined to thickness using a shellac chuck.



The small cylinders are fabricated in my usual way from some hexagonal brass rod and some K&S brass tube.








The K&S tube was soft soldered to its base and tippex (a correction fluid which contains chalk) was used to stop the solder contaminating the threaded hole.



The result of the first days efforts.



Regards Tony.
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MrMamod


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PostPosted: Sat Dec 17, 2016 6:11 pm    Post subject: Reply with quote

Love the tipex tip on threads when soldering  Thumbs up!
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Roly Williams


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PostPosted: Sat Dec 17, 2016 7:44 pm    Post subject: Reply with quote

MrMamod wrote:
Love the tipex tip on threads when soldering  Thumbs up!

Useful tip, that.
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belugawhaleman


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Joined: 06 Mar 2012
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PostPosted: Sat Dec 17, 2016 8:10 pm    Post subject: Reply with quote

Always enjoy you build threads
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Stoker


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PostPosted: Mon Dec 19, 2016 4:56 am    Post subject: Reply with quote

Tanwen is proving to be a very educational vessel and an excellent teacher!

Might almost call her a School Ship!!!
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Tony Bird


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PostPosted: Tue Dec 20, 2016 5:56 pm    Post subject: Reply with quote

Hi,

We have been away for a few days so I have only managed to screw the parts already made together.





I might get some more done tomorrow.

Regards Tony.
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Jon Cameron


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PostPosted: Tue Dec 20, 2016 6:00 pm    Post subject: Reply with quote

Looking good Tony, I'm assuming that the steel is used to avoid a line on the brass while in the lathe for turning, sort of a support surface to spread the load of the jaws pincer grip?
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Tony Bird


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PostPosted: Tue Dec 20, 2016 6:05 pm    Post subject: Reply with quote

Hi Jon,

Looking good Tony, I'm assuming that the steel is used to avoid a line on the brass while in the lathe for turning, sort of a support surface to spread the load of the jaws pincer grip?

Yes, to spread the load and stop marking, in this case aluminium was used but steel would be OK.

Regards Tony.
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Tony Bird


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PostPosted: Thu Dec 22, 2016 8:43 am    Post subject: Reply with quote

Hi,

Some more work has been done on the engine.  Flywheels have been turned and crank pins fitted.





The ports in the port block have been pilot drilled  then drilled to size and some of the steam passageways have also been drilled.




RH pilot drilled LH drilled to size.




Regards Tony.
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Tony Bird


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PostPosted: Thu Dec 22, 2016 5:54 pm    Post subject: Reply with quote

Hi,

The worm and wheel for the engine arrived today and were fitted into the square section aluminium tube.



It was decided because the one end of the engine was so much heavier than the other the engine would be converted so that it was inverted.  This means that when it is fitted in the hull the engines weight will be lower down and hopefully make the model more stable in the water.  The two parts of the engine apart.



The two parts of the engine joined together.



All the steam passageways have been drilled in the port and reversing valve blocks.

There is quite a size and weight difference between the Mk.1 and the Mk.2 engines.



Regards Tony.
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Tony Bird


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PostPosted: Fri Dec 23, 2016 5:42 pm    Post subject: Reply with quote

Hi,

As we are going away over Christmas only a bit of tidying up has been done on the engine today and it is likely to be the last work done on it this year.

Some relief was turned on the cylinders port face.



The cylinder bore and port face were laped.





The plug holes in the port block were tapped the nut is being used as a depth stop.



Plugs were glued into the port block.



Some of the plugs were not cut back but used as securing points for the feet of the engine.



All the parts so far made.



That is it I suspect until next year, so everyone have a great Christmas and a Healthy New Year.

Regards Tony.
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vpro


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Joined: 26 Apr 2013
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Location: UK

PostPosted: Fri Dec 23, 2016 6:10 pm    Post subject: Reply with quote

Tony Bird wrote:

That is it I suspect until next year, so everyone have a great Christmas and a Healthy New Year.

Regards Tony.


Nice work Tony. Merry Christmas to you as well.

Cheers
David
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martstb


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PostPosted: Fri Dec 23, 2016 6:44 pm    Post subject: Reply with quote

your threads are always so good and informative, merry xmas
and I look forward to more next year
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mogogear


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PostPosted: Wed Dec 28, 2016 5:37 am    Post subject: Reply with quote

Your usual top-peg work Tony!!
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pitchy


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PostPosted: Thu Dec 29, 2016 3:46 pm    Post subject: Reply with quote

Awesome, that piece for locating the ports is a great idea, I always have problems getting them in the right location.    
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