Author Topic: Rupnow Popcorn Engine  (Read 2555 times)

Offline rick41

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Rupnow Popcorn Engine
« on: March 05, 2017, 08:07:15 PM »
My version of the Potty Popcorn/Rupnow Engine.  Not the easiest build because of the Crosshead Guide.  I cut it out of a 1-1/4" steel dowel bar used in concrete highway construction.  The flywheel is cast iron and the rest is brass, aluminum, and steel bar stock.  I used steel plate for the base in lieu of the aluminum specified because of cost.  Only had to move one hole horizontally 1/64".  It is a really nice running engine.  I ticks along very nicely on 5 psi.  My thanks to Brian Rupnow for graciously providing the plans for this build.

Offline rick41

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Re: Rupnow Popcorn Engine
« Reply #1 on: March 05, 2017, 08:10:30 PM »
Guess I should have previewed my post I attached the wrong pictures.  Hopefully these are the correct ones.  Sorry about that

Offline Roger B

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Re: Rupnow Popcorn Engine
« Reply #2 on: March 05, 2017, 08:19:33 PM »
Those do look more like an engine and a very nice one at that  :praise2:
Best regards

Roger

Offline Jim Nic

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Re: Rupnow Popcorn Engine
« Reply #3 on: March 05, 2017, 08:56:35 PM »
A very good looking engine Rick, it would be nice to see it running.   :ThumbsUp:
Jim
The person who never made a mistake never made anything.

Offline philjoe5

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Re: Rupnow Popcorn Engine
« Reply #4 on: March 05, 2017, 11:01:27 PM »
Rick,
Beautiful work, it's a nice design.  I just asked for, and received, Brians plans (Thanks Brian :ThumbsUp:)

Cheers,
Phil
If you pick up a starving dog and make him prosperous, he will not bite you. This is the principal difference between a dog and a man.  - Mark Twain

Offline zeeprogrammer

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Re: Rupnow Popcorn Engine
« Reply #5 on: March 06, 2017, 12:04:49 AM »
Very nice.

I'd be interested in knowing how you did the Crosshead Guide.

This is an engine I'm very much interested in.

You mentioned Brian's plans. I also see some plans from Julius.
The engine in Julius' plans looks almost identical (should not be a surprise since it's a popcorn engine) but includes a governor.

Are Brian's plans available in the forum?

Thanks
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline b.lindsey

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Re: Rupnow Popcorn Engine
« Reply #6 on: March 06, 2017, 01:19:38 AM »
That turned out beautifully Rick. Yes a video would be great too!!  Well done  :ThumbsUp:

Bill

Offline Brian Rupnow

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Re: Rupnow Popcorn Engine
« Reply #7 on: March 06, 2017, 01:47:28 AM »
Well done Rick. Zee---It's been a while since I built my popcorn engine, but I remember doing a lot of work on that cross-head guide with ball nose endmills. If you want a set of the plans just email me and ask for them.----and tip your hat to Stu Hart of the U.K., because that is a copy of his original design.---Brian

Offline sbwhart

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Re: Rupnow Popcorn Engine
« Reply #8 on: March 06, 2017, 07:12:02 AM »
Good Job Rick. :ThumbsUp:

I'll post the plans up her when I fire up my other computer, for those who are interested, or alternatively drop me a PM with your email address and I'll email them to you.

Cheers
Stew
A little bit of clearance never got in the way

Offline rick41

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Re: Rupnow Popcorn Engine
« Reply #9 on: March 06, 2017, 03:21:54 PM »
Hope this little video comes through.  As I said, it is a nice running little engine.  When I finished the machine work and powered it up, it started immediately.  It has about 3 hrs run time and is pretty smooth now.  And yes, my thanks to Stu Hart for building the first one and sharing it.
Rick

 

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