Author Topic: Maudslay Marine Engine  (Read 7656 times)

Online rudydubya

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Re: Maudslay Marine Engine
« Reply #195 on: August 09, 2018, 07:04:50 AM »
Beautiful work, Chuck.  I really like the action and the slow running.

Regards,
Rudy

Offline Ramon

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Re: Maudslay Marine Engine
« Reply #196 on: August 09, 2018, 07:46:44 AM »
That's a truly great result Chuck and a superb runner - a fine replication from that original image too  :ThumbsUp: :ThumbsUp:

I can see several of these being made if drawings become available.

Congratulations on building and finishing it in such a short time  :praise2:

Tug
"I ain't here for the long time but I am here for a good time"
(a very apt phrase - thanks to a well meaning MEM friend)

Offline kvom

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Re: Maudslay Marine Engine
« Reply #197 on: August 09, 2018, 11:45:32 AM »
Super job!  :ThumbsUp:

Offline Johnmcc69

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Re: Maudslay Marine Engine
« Reply #198 on: August 09, 2018, 03:19:13 PM »
 :ThumbsUp:
Fantastic work Chuck! Beautiful fit & finish.

 John

Offline Steamer5

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Re: Maudslay Marine Engine
« Reply #199 on: August 09, 2018, 03:20:09 PM »
That's cool Chuck! Lovely work.

Cheers Kerrin
Get excited and make something!

Offline b.lindsey

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Re: Maudslay Marine Engine
« Reply #200 on: August 09, 2018, 04:04:13 PM »
A beautiful model Chuck and a fine addition to your collection.

Bill

Offline cfellows

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Re: Maudslay Marine Engine
« Reply #201 on: August 09, 2018, 11:13:15 PM »
Thanks, to all you folks, for the support during this project.  It's provided me the inspiration to continue and to make this the very best model I could.  In fact, it's probably the best job I've ever done in terms of beauty and precision. 

And, I discovered another thing last night.  I took the engine to my monthly meeting of the Austin Metal Working group to show it off.  One of the guys asked me if it was reversible and I said no, figuring the valving for one direction was about the limit of my ability and, to be honest, I wasn't even sure which direction the engine would run until a fired it up.  Well, one of the fellows, Ed Hume, who does a lot of steam engine work asked why I don't just feed the air into the exhaust side to reverse it.  At first, I thought it can't be that simple.  Well, it was.  The engine does indeed run the other direction if I reverse the air input.  Happy Accident!

So, now I'm going to design and build a throttle/reversing valve and figure out where to attach it permanently to the engine.

Edit:

Just saw Brian's reversing valve.  Looks like it might work on my engine as well.

Chuck
« Last Edit: August 09, 2018, 11:16:33 PM by cfellows »
So many projects, so little time...

Offline gbritnell

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Re: Maudslay Marine Engine
« Reply #202 on: August 10, 2018, 02:50:44 AM »
Congratulations on an outstanding build Chuck! The construction and detail of the parts is first class. I'm really amazed at how smoothly it runs.
Thanks for documenting the build.
gbritnell
Talent unshared is talent wasted.

Online 10KPete

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Re: Maudslay Marine Engine
« Reply #203 on: August 10, 2018, 05:21:18 AM »
The engine has a very fluid motion, very smooth. Simple and beautiful.

 :praise2:

I still want to know more about the valve....

Pete
Craftsman, Tinkerer, Curious Person.
Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline cfellows

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Re: Maudslay Marine Engine
« Reply #204 on: August 10, 2018, 06:47:06 AM »
Okay, folks, here goes an attempt to explain the valve set up.  First, a 2-D drawing.  Understand that the rocking motion of the cylinder effectively causes the valve to rotate 45 degrees back and forth with respect to the cylinder.



Here is a 3-D exploded view of the cylinder base, cylinder pivot shaft, and valve.  All the ports are shown but may be hard to make out.



As the valve rotates with the cylinder motion, the ports to top and bottom of the cylinder are alternately connected to the annular valve slot on the left, then the right through axial milled slots on the surface of the valve body.

More pictures from the drawings which shows different views of the parts and ports.





A closeup of the cylinder pivot shaft..



Closeup showing the ports which lead from the cylinder pivot shaft to the valve chamber



Keep in mind that even tho I've labeled ports as inlet and exhaust, I later learned that reversing the airflow will reverse the engine rotation direction.
So many projects, so little time...

Offline cfellows

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Re: Maudslay Marine Engine
« Reply #205 on: August 10, 2018, 07:01:02 AM »
One more image.  Blue line is high pressure in, Red line is the exhaust.  Continue scrolling down, more pictures / description further down...

« Last Edit: August 10, 2018, 07:07:49 AM by cfellows »
So many projects, so little time...

Offline Admiral_dk

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Re: Maudslay Marine Engine
« Reply #206 on: August 10, 2018, 11:42:13 AM »
Thank you very much Chuck for a very interesting journey from idea to a very fine runner + documentation  :praise2:

Best wishes

Per

Offline b.lindsey

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Re: Maudslay Marine Engine
« Reply #207 on: August 10, 2018, 01:07:02 PM »
Many thanks for the explanation of the valve Chuck. That helps a lot!!

Bill

Online 10KPete

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Re: Maudslay Marine Engine
« Reply #208 on: August 10, 2018, 03:33:45 PM »
Now I see how it works! Thank you very much for the drawings and explanation, Chuck.
Very clever bit of work, that.

 :cheers:

Pete
Craftsman, Tinkerer, Curious Person.
Retired, finally!
SB 10K lathe, Benchmaster mill. And stuff.

Offline Tennessee Whiskey

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Re: Maudslay Marine Engine
« Reply #209 on: August 10, 2018, 04:32:59 PM »
An absolute beauty Chuck. Definitely deserves a Round Rock doughnut. What is your favorite flavor Chuck?

Eric