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Author Topic: Steam Engine  (Read 2000 times)

Propslip

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Steam Engine
« on: January 03, 2019, 04:39:22 pm »

I am still trying to identify this engine. Any ideas anyone. I guess its custom made, maybe from a plan, rather than off the shelf.
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rhavrane

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Re: Steam Engine
« Reply #1 on: January 03, 2019, 07:31:09 pm »
Bonjour Propslip,
Classical oscillating machine, difficult to refer to a dedicated plan and you are right, certainly custom made. Mixing aluminium and brass is not common for professionals, too sophisticated to be built for low prices products.
The most important point is to know its displacement and if it runs well without too much leaks.
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Raphaël
Raphaëlopoulos Steam Lines UnLimited
Membre du Modele Yacht Club de Paris http://mycparis.fr/
Membre de l'Offshore Club de Paris : http://site-ocparis.wifeo.com/
My YouTube channel: http://www.youtube.com/user/rhavrane

Propslip

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Re: Steam Engine
« Reply #2 on: January 03, 2019, 07:47:46 pm »

Thank you for that. I have not steamed it yet. It is in a tug. Do you know if it would be self starting ahead & astern?
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rhavrane

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Re: Steam Engine
« Reply #3 on: January 04, 2019, 07:50:46 am »
Bonjour Propslip,
Yes, no problem for the self starting if built "as usual" with a difference of 90° between the two cylinders. Perhaps not fully progressive.
Example of one of mine : https://www.youtube.com/watch?v=VpQjcY7Qdqo
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Raphaël
Raphaëlopoulos Steam Lines UnLimited
Membre du Modele Yacht Club de Paris http://mycparis.fr/
Membre de l'Offshore Club de Paris : http://site-ocparis.wifeo.com/
My YouTube channel: http://www.youtube.com/user/rhavrane

southsteyne2

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Re: Steam Engine
« Reply #4 on: January 04, 2019, 09:34:04 am »
Hi Raphael I am a bit concerned about the gas tank so close to the boiler,
Cheers

John
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Propslip

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Re: Steam Engine
« Reply #5 on: January 04, 2019, 10:09:20 am »

The gas tank has not yet been fitted. I just placed it in a convenient location for the pictures. This leads me on to a couple of further queries. Is the hight of the gas tank critical, It would fit in top or the feedwater tank in the bow or it could go further aft as in this picture but that would put it a fair distance from the burner.
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Moxis

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Re: Steam Engine
« Reply #6 on: January 04, 2019, 01:21:56 pm »
Very lnteresting coupling between engine and propshaft. What is the purpose of that electric motor? Starting help for steam engine if not selfstarting?
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Propslip

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Re: Steam Engine
« Reply #7 on: January 04, 2019, 02:56:46 pm »

I am not sure about the electrics. I assume the cone on the driveshaft is some sort of clutch. The 7.2v motor is connected via a reduction gearbox through a coupling onto a spur on the cone on the driveshaft. I have powered up the motor & it drives the propshaft sweetly. Again I do not recognize any of the component parts, the Clutch, Gearbox or Couplings. The only thing I do recognize is the bog standard 7.2v motor. Maybe they come from a tank or some other vehicle.
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Mark T

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Re: Steam Engine
« Reply #8 on: January 04, 2019, 05:07:55 pm »
Is the motor to get you home should you run out of steam?  I guess it could also be used just to sail should you not feel like lighting the boiler up?
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Propslip

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Re: Steam Engine
« Reply #9 on: January 04, 2019, 05:31:19 pm »

I assume it is. I did not build this set up but as an ex Marine Engineer it interests me & I would love to get it running on steam & electric (Not both at once). The good people at Model Slipway are already supplying me with the parts I need to finish the hull. I am just looking for solutions to a few technical issues. It looks like there was an electric driven feed pump as it has a return spring on the operating lever. The feedwater tank also has high & low level sensors. All a bit over engineered but very interesting.
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Steamedup

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Re: Steam Engine
« Reply #10 on: January 04, 2019, 05:46:55 pm »
 :-))
Nice motor
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Geoff

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Re: Steam Engine
« Reply #11 on: January 28, 2019, 01:45:32 pm »
As a consideration on my steam models I position the oil seperator right next to the gas tank, in fact just touching it. This provides gentle warmth to the gas tank and helps keep a stable pressure and flame.


As the liquid gas evapourates it takes energy from the air which has the effect of cooling the tank. In some open launches this can get to the point where ice can form on the gas tank. As its cold it reduces the gas pressure and size of the flame. The corrolary being gently warmth will remove this as a probelam and raise the gas pressure a little giving a better flame. At the end of a run I find the gas tank "hand warm" which in my opinion is perfect.


Good luck with the model, it looks very interesting.


Cheers


Geoff
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Propslip

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Re: Steam Engine
« Reply #12 on: January 28, 2019, 02:43:20 pm »

Thank you for that information. It is indeed an interesting project. I have bought one of the Chinese gas regulators & one of there electric feed pumps as well. The good people at Model Slipway have supplied me with plans & all the parts I need to complete the hull. So I hope to get it up & running over the winter months.
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