Swifty's build of Rupnow engine.

[Swifty]

I've made some brackets and mounted up the fuel tank as you will see in the photo's. Now all I have to do is put the electrics back on, fill the tank and fire it up.
Apart from mounting it on a permanent baseboard, the engine just needs a polish and it's finished.




And here is a picture of the spring and brass weights that I am using on the governor.



Paul.

 

[canadianhorsepower]

awesome work hope mine will look that good

 

[Swifty]

I'm sure that your engine will look great, everyone puts their individual touches to their build, it's great to see the methods that others use to make the same item.

Paul.

 

[metalmad]

Top Job swifty
She's a sweetheart
Pete

 

[Brian Rupnow]

Nice tank Swifty. You do great work.---Brian

 

[Swifty]

Thanks guys. Brian, if it wasn't for you calling for members to build your engine, I would probably still be making air operated ones.

Paul.

 

[Brian Rupnow]

Swifty--I am pleased to no end that you answered the call and built my engine. You have done an absolutely masterful job of it. There is however, a great danger in what you have done. You may never again be totally satisfied with air operated engines. I was perfectly happy, and thrilled with my air operated engine builds. Then after building about a dozen, I decided that I needed something with a bit more challenge. I built the Webster i.c. engine, and was immediately hooked, and it opened up a whole new world of exciting builds for me. Thank you so much for building this engine. I hope you have enjoyed it and met a few new people though the build.---I hope you stay involved until all of the engines are completed. Lean on Pat Hutcheson a bit to start posting about the Rupnow Engine he is building--Brian

 

[ELM6061]

Well as always, I am in awe of your work Paul. A master of the machines, materials that you work with and if Brian is correct with his "danger" prediction, I look forward to see what the future holds for you.
Brain I must also say, you are an inspiration and great asset to the forum. The involvement and friendship amongst forum members, that you have built up from this little engine alone, is amazing. I tip my hat to you sir.

To everyone that is giving this little motor a go, credit must also go to you for sharing your knowledge and experience as well. Pat Hutcheson I look forward to reading, comparing your take on this little gem.

Eddie

 

[gus]

Fuel tank and bracket very well done. Will be hard to copy. Thm:
Were the fittings silver brazed or just plain soldered on.

Please post video with engine running.

About to go fishing.( Must been too tired,messed up three pinion gear blanks but the 3/8 machine reamer performed well and its a Taylor & Jones UK Machine Reamer. Or maybe my gear cutting skill gone bad.)

 

[Swifty]

Gus, that is actually my second attempt at the fuel tank, the first one I silver soldered and thought that it would be ok, but the soldering wasn't great and it leaked. The second one I used lead solder and actually tinned the ends of the tube before putting the brass end caps on and finishing it. I use a Mapp torch for soldering and absolutely love it.

I originally planned to make the tank mounts from solid stock, but suddenly had the idea to use some brass strip that I have. I just bent the strip around a steel bar, hammering it where necessary, but I was thinking afterwards that it would have been better to make up a simple bending jig.

I'm waiting to get hold of a decent video camera before I post another video, I wonder if the $60 5 MP cameras are any good? I have seen them in a couple of places lately.

I had the engine running this morning, stopped and started for a while as I played around with the spring tension for the governor, I also made a bit of a guide for the spring to stop it rubbing on the threaded shaft, I will post a picture of it later. The longest I let the engine run was for 20 minutes, the cylinder was warm, but I could still hold it with my bare hand. The engine appears to fire twice and then freewheel about 5 times, then fire twice again. I had the pin holding one of the ball weights in come out and the weight actually hit me in the chest, will make the pins a tighter fit.

Paul.

 

[AussieJimG]

That's a good looking engine Swifty, congratulations.

Jim

 

[Smithers]

Sweet, really nice build Swifty and well detailed, don't know how I missed this thread.
Andrew

 

[Swifty]

Andrew, how is progress on your build going?

Paul.

 

[Smithers]

Hi Paul,
Bogged down at the moment!! Just finding it hard to get motivated to do anything after work, I spend all day machining parts for a living, but I will get back into it. Ordered the CDI ignition, plug and boot today.

Andrew

 

[Brian Rupnow]

Andrew--I couldn't do that---machine parts all day and then build model engines as a hobby. I have been a machine designer for almost half a century, but actually machining something is a whole new game to me. When I was younger, and really needed the money, a lot of my co-workers were working Saturdays and evenings doing architectural drawings or "moonlighting" work for other engineering firms. I just couldn't do it. 8 hours a day of design work was all I could stand.--I fully understand the old adage about "The shoemakers children going barefoot".--The poor shoemaker was probably like me--after a day spent making shoes for other folks, he had no energy left to work in the evenings and weekends.

 

[Smithers]

Brian, not making any excuses, I absolutely love the model engineering thing, have done for the last 30 odd years, I cannot believe the quality and perfection obtained in not only this build, but in every build (wish I could post this in every build). Yes, I'm a machinist, early days all manual machining turning dials but in later years just CNC programming but still love making anything from metal whether its conventionally done or by pressing a "start" button on a CNC. I also have a fascination with CAD, having started off on AutoCAD at home, progressing to design for 6 years using Unigraphics full time before returning to getting my hands dirty in the machining game. Anyway, enough of hijacking this thread, to all building Brian’s engine.... go for it...and thank you Brian for all your design/drawings/explanations and genuine interest in all people committed to building this engine.

Andrew

 

[gus]

Andrew--I couldn't do that---machine parts all day and then build model engines as a hobby. I have been a machine designer for almost half a century, but actually machining something is a whole new game to me. When I was younger, and really needed the money, a lot of my co-workers were working Saturdays and evenings doing architectural drawings or "moonlighting" work for other engineering firms. I just couldn't do it. 8 hours a day of design work was all I could stand.--I fully understand the old adage about "The shoemakers children going barefoot".--The poor shoemaker was probably like me--after a day spent making shoes for other folks, he had no energy left to work in the evenings and weekends.

Hi Brian & Andrew,

May I chip in.
I ran a machineshop with full compliment of machine tools Leblonde Lathes,
Okamoto Vertical mill,Okamoto Surface Grinder,China Shaper,China Vertical
Slotting Machine,80 ton Air Bender#,200 ton Deep Draw Press#, Auto S/Arc
Welders,Mig Welders,Rotary Welder#,Main SeamWelder,Guillotine Cutters,
WheelaBrator(copied) Blasting Machine"#,OverHead Cranes#,Auto Oxy Cutters,Aluminium Furnace#,100 ton China Stamping Press and no time and energy left after 5:30pm. More than enough machine tools to builder bigger Model Engines. So much cut-offs left over bar stocks.

# Designed and build by Gus and his team.
The consolation I have was successfully building these Production Machines# from scratch to make air receivers. Have no regret looking back.

 

[Swifty]

I made the muffler that Brian drew up, however I made a slight change, instead of a series of holes I machined a radial slot. As Brian said, it's more to direct the exhaust downwards to avoid oil marks on my shirt.


I also found that the spring for the governor was tending to get caught on the threaded rod that it slides on, so I machined up a bush that goes over the threaded rod and fits inside the spring.


Paul.

 

[Brian Rupnow]

Very nice Paul. That's the neat things about these small engines. As long as someone has designed a working basic module, you can make all kind of nifty changes to "personalize" them.--I could see the knurled knob on the threaded rod dancing all over the place in the video, and kind of thought that must be what was happening.---Brian

 

[Swifty]

Brian, at the time that I took the video the threaded rod was a loose fit in the tapped hole, that's why it was dancing all over the place. I have since loctited it in.