Potty Popcorn Engine

Ramon · Dec 1, 2011

Hi Stew, you already know what I think from ME forum but it's certainly worth repeating here.
Extremely well made, very nicely painted and beautifully presented.

Well done - it's a credit to you. Thm: Thm: Thm:

Regards - Ramon

metalmad · Dec 1, 2011

Its gorgeous, Stew :bow:

danstir · Dec 1, 2011

I thought it looked great before, but with the new paint lob it is fabulous!!

SBWHART · Dec 1, 2011

Thanks for all your support and kind comments Guys

What next well

I've got my eye on one of these beasts.

http://www.aqpl43.dsl.pipex.com/MUSEUM/POWER/rotaryengines/rotaryeng3.htm

Simpson and Shipton Reciprocating steam engine, best way I describe it is that its works with a captive eccentric.

Antony Mount made one a few years ago and polly model suply castings for it.

From my research only two were made the first was displayed at the great exhibition and drove some textile machinery, this was the basis of Antony Mounts engine apparently a second was made with a diferent power take off but there are no images of it.

So i think I may use the speculation of this second engine as a basis for my model, got some ideas on how to configure the drive, I don't have any drawings to work to so I'll have to figure things out as i go along, and it will be fabricated from bar stock some how. ???

Stew

Captain Jerry · Dec 2, 2011

Would someone please check on Stew. I think he's gone round the bend.

Jerry

SBWHART · Dec 2, 2011

;D ;D ;D ;D

Nice one Jerry

Not quite round the bend.

This was posted on madmodder regarding the Simpson and Shipton

Achim Meyer did one Simpson from bar stock:

http://dampfforum.info/viewtopic.php?f=1&t=7997&hilit=Simpson
Unfortunately, you have to become a member of the Dampfforum to see the topic.
I'm sure,Achim will be glad to show you his drawings.

All images are taken from the Dampfforum

[youtube]http://www.youtube.com/watch?v=r76WwOd7RMM&feature=player_embedded[/youtube]

Cheers,Ralph

Thats one very nice model:- if you click on the link to the site there is a video of the engine running.

Stew

No its her

[youtube]http://www.youtube.com/watch?v=r76WwOd7RMM&feature=player_embedded[/youtube]

Lesmo · Dec 3, 2011

You certainly like a challenge don't you Stew, but having looked at the video I can certainly see the attraction. That lovely fluid motion reminds me of your over-crank engine. This is one I shall certainly not be missing. More power to your elbow young man, we all know you can do it.

Les

steamer · Dec 3, 2011

I couldn't get the links to work

I found it ...here it is
[youtube=425,350][/youtube]http://www.youtube.com/watch?v=r76WwOd7RMM

Cool engine!

steamer · Dec 3, 2011

Thats a cool engine and a awesome model. I'm wondering how tough it must of been to keep to keep the full sized "piston/cylinder"....if we can call it that...lubricated during operation!

Some excellent minds back then...probably to get around the Watts patent..?

Dave

SBWHART · Dec 3, 2011

steamer said:
Thats a cool engine and a awesome model. I'm wondering how tough it must of been to keep to keep the full sized "piston/cylinder"....if we can call it that...lubricated during operation!

Some excellent minds back then...probably to get around the Watts patent..?

Dave

Dave I think your correct about it getting round the Watt patent, a lot of those weird and wonderfull engines came from that desire.

I've no idea about the lubrication, but one thing that was intersting about the full size engine was that the side plate could be adjusted inward to take up wear.

Antony Mount in his model machined a groove arround the flat rim of the piston and used graphite packing to make the seal.

It certainly calls for a close fit between piston and cylinder.

Thansk for your interest.

Stew

Dave · Jan 7, 2014

I like the looks of this popcorn engine , could you send me a copy of the plans.

David Oulton , [email protected] thanks

gus · Jan 11, 2014

Hi Stew,
PopCorn Steam Engine.
Very well done. Please advise material of belt drive for the governor. I used thick rubber band but they have very short live. The engine frame was very well done.I had to cheat a wee bitty because of the very small mini miil.

Looks like you have stirred up the hornets' nest and now many of us want to build this engine.

Brian Rupnow · Jan 12, 2014

Gus--Use a rubber o-ring. They make great drive belts for any kind of model engine, both steam or i.c.--Brian

gus · Jan 14, 2014

Hi Gentlemen,
Guess I am the first in the que after Stew to build this Popcorn Steam Engine.
Done three years ago but not completed or painted a I have yet to out in a belt drive for the governor that will last.Bought the Mamod spring belts which was hard to join up.

robcas631 · Jan 14, 2014

Outstanding work!

gus · Jan 15, 2014

robcas631 said:
Outstanding work!

Hi Rob,

Thanks but Gus is not trying to hijack Stew's show. Just complimenting and trying to encourage more members to build this engine.

When I saw same engine in the Model Engineer Mag, I got so thrilled and conned myself into building engine which looked easy to build but wasn't so. Glad I got to finish it as a running engine but not yet a showpiece. Now gathering cobwebs and the wifey boss is not happy.

Got myself conned again into building another 120mm R.Table. The last DIY RT cannot take heavier cuts w/o vibrating.Will post shortly and called the post---------Just another R.T.

Brian Rupnow · Jan 19, 2014

Gus--This is not a popcorn engine, but rather a twin cylinder steam engine of my own design, with a governor of my own design. You can see the rubber o-ring which drives the governor. I use 0.100" diameter O-rings for drive belts on al of my small (model) machinery. They are available in any length, they don't stretch, and they are very inexpensive.----Brian

gus · Jan 19, 2014

Hi Brian,
Thanks for info.

SBWHART · Jan 20, 2014

Hi Gus

Thanks for you interest in the popcorn engine.

To answer your? regarding driving the governor I used O ring cord that I got off ebay you can join it up to make any length of belt you want using supper glue you just have to make sure you cut the ends square and clean.

Stew

gus · Jan 21, 2014

SBWHART said:
Hi Gus

Thanks for you interest in the popcorn engine.

To answer your? regarding driving the governor I used O ring cord that I got off ebay you can join it up to make any length of belt you want using supper glue you just have to make sure you cut the ends square and clean.

Stew

Thanks.You have solved my governor drive belt problem. Will finish up my popcorn engine plus mounting it on a good looking timber base.

Potty Popcorn Engine

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