Topic: BUILDING A STUART TWIN LAUNCH ENGINE & BOILER (Read 43279 times)

Patternmaker · « **on:** January 21, 2011, 01:46:06 pm »

Building a Stuart Twin Launch engine from a set of castings.

I was very surprised at what materials are not included, a total of 32 parts including the crankshaft which doesn't matter as I am going to machine from 40mm ENA1 steel. As I have a good stock of materials its not
a problem. and I got a good deal on the castings set.

In my opinion its buyer beware as because until you have bought the Castings you will not know what else is needed to build this engine.

The boiler is designed by George (ooya/2) who has kindly given me plans and his expertise how to build it.

rathikrishna · « **Reply #1 on:** January 22, 2011, 06:40:06 am »

WOOW...its a great stuff...please follo..and keep posting...please...

Patternmaker · « **Reply #2 on:** January 22, 2011, 09:45:47 am »

rathikrishna,
I will post pictures of each stage of machining, I am making some changes to the original design, I will use stainless steel for the 5 columns, all nuts & bolts, grub screws & brass cylinder top covers.

In between building the engine & boiler I will build the launch for it.

Mick

gondolier88 · « **Reply #3 on:** January 22, 2011, 11:30:49 am »

I'm looking forward to this Mick, good luck.

kno3 · « **Reply #4 on:** January 22, 2011, 05:16:26 pm »

Good luck with your build. This is a beautiful engine when finished.

rathikrishna · « **Reply #5 on:** January 23, 2011, 05:50:19 am »

OHHH...nice...and also waiting for a nice video from you...sure..?

Patternmaker · « **Reply #6 on:** January 23, 2011, 08:47:34 am »

Quote from: rathikrishna on January 23, 2011, 05:50:19 am

OHHH...nice...and also waiting for a nice video from you...sure..?

There will be a video eventually, but that's a long way off with over 100 individual parts to machine for the engine without Boiler and Feed Pump.

rathikrishna · « **Reply #7 on:** January 23, 2011, 12:47:52 pm »

HAPPY....

)THANK YOU...take your own time to finish it....

Patternmaker · « **Reply #8 on:** February 04, 2011, 02:50:48 pm »

Cylinder machined, bores honed with brake wheel cylinder honing tool, Piston ring shown in left hand bore.
Crankshaft webs machined from 28mm EN1A steel brazed to silver steel main shaft.

kno3 · « **Reply #9 on:** February 04, 2011, 03:23:17 pm »

Nice work. What is the piston ring made of?

Patternmaker · « **Reply #10 on:** February 04, 2011, 03:37:48 pm »

Quote from: kno3 on February 04, 2011, 03:23:17 pm

Nice work. What is the piston ring made of?

The piston rings are cast iron 2 per cylinder

Mick

gondolier88 · « **Reply #11 on:** February 04, 2011, 05:30:34 pm »

Beautiful Mick, well done! Are the counter-weighted webs your idea, they look fantastic? Was the piston ring turned from CI bar?

Greg

Patternmaker · « **Reply #12 on:** February 04, 2011, 05:48:37 pm »

Greg,

I decided to machine the counterweighted webs although its not possible to perfectly balance the shaft with 90 deg offset but they should make a smoother running engine, the piston rings are included in the Casting set.

Mick

Patternmaker · « **Reply #13 on:** February 13, 2011, 03:06:55 pm »

Sole plate & bearing caps with crankshaft fitted.

Patternmaker · « **Reply #14 on:** February 22, 2011, 06:12:46 pm »

Bottom cylinder covers & Slider Bracket incorporating reverse shaft.
Reverse shaft, columns & sliders made from stainless steel, not included in castings set.

Patternmaker · « **Reply #15 on:** March 04, 2011, 03:46:36 pm »

Con rods, cross heads & pistons.the cross heads have been made by filling as they would very difficult
to machine.

J.Walpot. · « **Reply #16 on:** March 05, 2011, 08:56:06 am »

Beautiful work Mick. I wish you lots of fun building the other parts.

Regards Jan.

Patternmaker · « **Reply #17 on:** March 05, 2011, 06:44:58 pm »

Thanks Jan, have you built a Stuart Twin?

Mick

J.Walpot. · « **Reply #18 on:** March 05, 2011, 07:58:09 pm »

Hallo Mick.

No I didn't. I made my own designed engine for my model tug Maarten. You can find it on this forum.

Regards, Jan.

Patternmaker · « **Reply #19 on:** March 05, 2011, 09:45:30 pm »

Hello Jan, you are to be congratulated on your superb workmanship and design skills on your engine and Tug Maarten.

Regards Mick

Patternmaker · « **Reply #20 on:** March 10, 2011, 04:46:22 pm »

Flywheel & eccentrics, Stuarts use to cast a stub on the back of the eccentrics to hold in the chuck, my castings did not have the stubs, the only way to machine them is to manufacture a mandrel to fit the crankshaft bore in order to hold in a independent 4 jaw chuck to get the 20 degree offset from the
centre line of the crankshaft on each eccentric.

Flyerjeff · « **Reply #21 on:** March 13, 2011, 12:58:13 am »

Could I ask what equipment you are using to machine your parts?
I have always wanted to build this engine myself but only have a Sherline lathe and Mill.
Beautiful Work!!!!!

Thanks!!!!

gondolier88 · « **Reply #22 on:** March 13, 2011, 10:45:04 am »

Hi Mick,

Those eccentrics look great- I can't imagine ST are on such a cost saving drive as to not include a machining spigot anymore!

The green you've used on the flywheel is a really nice colour, what paint have you used?

Greg

Patternmaker · « **Reply #23 on:** March 13, 2011, 02:38:18 pm »

Hi,
I have a Clarke 300M variable speed lathe with optional extras; 4 jaw independent chuck, fixed steady, travelling steady, revolving tailstock, 6” faceplate and tailstock chuck. A very good lathe, apart from
the plastic gears, they tend to strip on the keyways, I have put steel inserts in the centres of the gears which has cured the problem.
I have a Clarke CDM 10 Micro milling machine, does everything I want no complaints with this machine.

I have looked up the details of your Sherline Lathe Mill, I don't see any reason why you should not be able to build a Stuart twin on this lathe and mill.

Regards Mick

Patternmaker · « **Reply #24 on:** March 13, 2011, 02:41:13 pm »

Hi Greg,

Yes, I must admit I was very disappointed with the casting set considering what they cost and extra materials needed as I have told Stuarts, your web site is misleading in the description of the casting set.

The paint is Japlac British racing green.

Mick

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Author Topic: BUILDING A STUART TWIN LAUNCH ENGINE & BOILER (Read 43279 times)

Patternmaker

rathikrishna

Patternmaker

kno3

rathikrishna

Patternmaker

rathikrishna

Patternmaker

kno3

Patternmaker

Patternmaker

Patternmaker

Patternmaker

Patternmaker

J.Walpot.

Patternmaker

J.Walpot.

Patternmaker

Patternmaker

Flyerjeff

Patternmaker

Patternmaker