Author Topic: Rocker V Stirling Engine  (Read 10479 times)

Offline Plani

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Rocker V Stirling Engine
« on: September 02, 2017, 08:18:48 PM »
Hello all

This time I would like to introduce my Stirling engine Project. It is actually not my invention. This type of Stirling engine was was designed by Andy Ross who is in my opinion a real master of building Stirling engines. A while back I got in touch with him about some Stirling related questions an he kindly helped me and also provided copies of articles he wrote about his engines. And a couple days later I received a package containing two nice deep drawn stainless steel cups:



This was the starting point for this project. And since I made the drawings for it, I think it's ok to put it under my own design...

The Engine is an alpha Stirling. It incorporates a rocking compression piston and will be balanced like a 90 Vee twin. Therefore it's called a Rocker V. The swept volume is 9cc.

And this is how I think the whole thing should look like:




Plani
« Last Edit: May 02, 2018, 05:55:38 AM by Plani »

Offline yogi

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Re: Rocker V Stirling Engine
« Reply #1 on: September 02, 2017, 09:32:26 PM »
Very cool Plani!  8)
Looking forward to see the engine come to live.  :ThumbsUp: :ThumbsUp: :ThumbsUp:

Offline Ye-Ole Steam Dude

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Re: Rocker V Stirling Engine
« Reply #2 on: September 02, 2017, 10:45:00 PM »

Add me to the list of followers on this build.

Thomas

Offline Dave Otto

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Re: Rocker V Stirling Engine
« Reply #3 on: September 03, 2017, 12:30:32 AM »
Looks like an interesting design, looking forward to seeing it take shape.


Dave

Online b.lindsey

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Re: Rocker V Stirling Engine
« Reply #4 on: September 03, 2017, 12:57:04 AM »
Nice looking design Plani.  A while back a friend gave me the casting pictured below and assorted parts including two drawn cups also. Maybe you know something about this engine as well. I do have some written plans but not a lot in the way of drawings.

Bill

Online Jo

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Re: Rocker V Stirling Engine
« Reply #5 on: September 03, 2017, 07:37:08 AM »
Nice, I still have to find a Stirling to add to my list of engine to build so I will be following along  :).

Jo
Usus est optimum magister

Offline Ian S C

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Re: Rocker V Stirling Engine
« Reply #6 on: September 03, 2017, 12:38:57 PM »
Bill, that B 20 kit of Andy Ross's turns into a powerful little motor, although in his book "Making Stirling Engines" he does say that some people were having difficulties building the motor. If you have any problem, give him an E-mail, I hear he is more than happy to help.
Plani, this motor looks very interesting, I'll be watching this one.
Ian S C

Online b.lindsey

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Re: Rocker V Stirling Engine
« Reply #7 on: September 03, 2017, 01:41:11 PM »
Thanks Ian. Looks like I need to find the book and do some reading up on it.

Bill

Offline Plani

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Re: Rocker V Stirling Engine
« Reply #8 on: September 03, 2017, 08:11:43 PM »
Thank you all for the kind comments.

Bill, you are lucky! This is a B20 engine kit made by Andy Ross. Here is the one of Andy himself:
https://www.youtube.com/watch?v=402tNFGY23Q
The intention of these kits was to get people to do experiments and development work on small Stirling engines. But this turned out to be difficult and so the production of these kits was discontinued. 
As Ian said, it will make a powerful little Stirling engine. And if you have any particular questions about the kit, I think too Andy Ross will be helping you.

Plani

Offline Ye-Ole Steam Dude

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Re: Rocker V Stirling Engine
« Reply #9 on: September 03, 2017, 08:20:52 PM »
Thank you all for the kind comments.

Bill, you are lucky! This is a B20 engine kit made by Andy Ross. Here is the one of Andy himself:
https://www.youtube.com/watch?v=402tNFGY23Q
The intention of these kits was to get people to do experiments and development work on small Stirling engines. But this turned out to be difficult and so the production of these kits was discontinued. 
As Ian said, it will make a powerful little Stirling engine. And if you have any particular questions about the kit, I think too Andy Ross will be helping you.


Plani


Just watched the video and it appears to be a very nice and powerful engine

Thomas

Online b.lindsey

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Re: Rocker V Stirling Engine
« Reply #10 on: September 03, 2017, 09:52:50 PM »
Thanks for that link Plani. I've had this thing sitting around for a while, maybe I need to pay it more attention :)

Bill

Offline Plani

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Re: Rocker V Stirling Engine
« Reply #11 on: September 04, 2017, 07:57:24 PM »
Yes Bill, I think you certainly should  ;)      :stickpoke:

Plani

Offline Plani

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Re: Rocker V Stirling Engine
« Reply #12 on: September 04, 2017, 08:16:28 PM »
But now lets get started with making parts. I started with the flywheel. Luckily there was a disc of free cutting steel in the cutoffs bin of just about the right diameter. That made life really easy. Unfortunately I forgot to take a picture while turning the Flywheel  :facepalm:

So we start where the spokes are milled:


The spokes where then rounded with a radius cutter:


Then the Flywheel was was chucked on its hub to drill and ream the center hole:


And this is the finished part:


Plani
« Last Edit: May 02, 2018, 05:56:31 AM by Plani »

Online b.lindsey

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Re: Rocker V Stirling Engine
« Reply #13 on: September 04, 2017, 08:45:58 PM »
That certainly turned out well!! Very nicely done.

Bill

Offline Plani

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Re: Rocker V Stirling Engine
« Reply #14 on: September 13, 2017, 08:19:21 PM »
Thank you Bill  :cheers:

I went on with some con rods.

The conrod for the expansion piston was fixed on a piece of aluminum to get it it contoured:


The seat for the big end bearing milled:


The finished part:


The machining pictures of the short con rod didn't turn out usable :facepalm2:
But the part itself is ok  ;D:




Plani
« Last Edit: May 02, 2018, 05:57:00 AM by Plani »