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Old 04-03-2012, 08:58 PM   #1
KBC
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Default Stuart Turner Launch engine con rod.

Hi,
This is my first posting on this forum although I have had many tips from reading members postings.
I am in need of a Stuart Turner Launch engine con rod casting does anybody have a spare that I could purchase.
As I was machining into the neck of the rod the tool dug into the cast gunmetal casting and it has ruined the casting.

I am about 75% completed and Stuart doesn't have any spares ( whats new ?? )
Any help would be appreciated.
Geo.



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Old 04-03-2012, 11:58 PM   #2
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Default Re: Stuart Turner Launch engine con rod.

Welcome Geo-

I started looking at all the various Stuart engine types the other day, trying to figure out how many different models were made.
The more I looked, the more types I found (some apparently discontinued).

Here is my list (this list may or may not be accurate).

So what type of Launch engine do you have?
Bore, stroke, compound, or simple?

------------------------------------------------------------------------------
Vertical A-Frame style Engines
(all with cylindrical crosshead and Stephenson's reverse gear or reverse gear option)

Cygnet
Vertical A-Frame Single
bore: 2.25", stroke: 2"
(Discontinued?)

Swan
Vertical A-frame Twin (looks like two Cygnets)
bore: 2.25", stroke: 2"
(Discontinued?)

No. 5A
Vertical A-Frame Single (looks like a Cygnet, but without the accessories)
bore: 2.25", stroke: 2"

(Discontinued?)

No. 4
Vertical A-Frame Single
bore: 1.5", stroke: 1.25", flywheel: 5"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/65

No. 7A
Vertical A-Frame Single
bore: 1", stroke: 1", flywheel: 3.5"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/50

No. 10V
Vertical A-Frame Single
bore; 0.75", stroke: 0.75", flywheel: 3"
(Discontinued?)

No. D10
Vertical A-Frame Twin Engine (Looks like a slightly smaller twin version of the 7A)
bore: 0.75", stroke: 0.75", flywheel: 1.625"
http://www.stuartmodels.com/inprod_det.cfm/section/machined/mod_id/27

------------------------------------------------------------------------------
Horizontal Engines

Mill Engine (Horizontal Single)
Loco crosshead, valve on side of cylinder, long stroke.
bore: 0.625", stroke: 1.25"
(Discontinued?)

Victoria (Horizontal Single)
Loco crosshead, valve on top of cyinder, long stroke.
bore: 1", stroke: 2"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/46

Victorian Twin (Horizontal Twin)
Loco crosshead, valve on top of cyinder, long stroke.
bore: 2x1", stroke: 2"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/47

No. 9 (Horizontal Single)
Slipper-type crosshead, valve on top of cylinder, short stroke.
bore: 1.5", stroke: 1.5", flywheel: 5.125"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/49

No. 8 (Horizontal Single)
Cylindrical crosshead, valve on side of cylinder, short stroke.
bore: 1", stroke: 1"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/66

No. 10H (Horizontal Single)
Cylindrical crosshead, valve on side of cylinder, short stroke.
bore: 0.75", stroke: 0.75", flywheel: 3"
http://www.stuartmodels.com/inprod_det.cfm/section/machined/mod_id/28

Score (Horizontal Twin)
Looks like two No.10H's.
Cylindrical crosshead, valve on side of cylinder, short stroke.
bore: 2x0.75", stroke: 0.75", flywheel: 3"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/42

------------------------------------------------------------------------------
Open Column Marine Engines (all with Stephenson's reverse gear or option)

Twin Launch (Open Column Twin Launch - Single Expansion)
bore: 2x1", stroke: 1", flywheel: ?
(Discontinued?)

Twin Launch Compound (Open Column Twin Launch - Double Expansion)
bore: 0.75" and 1.25", stroke: 1", flywheel ?
(Discontinued?)

No. 3 (Open Column Twin Launch - Single Expansion)
http://www.stationroadsteam.co.uk/Stuart/No.3.htm
bore: 2x2.5" (single expansion configuration)
stroke: 1.5"
(Discontinued?)

No. 3 (Open Column Twin Launch - Double Expansion)
http://www.stationroadsteam.co.uk/Stuart/No.3.htm
bore: 1.5" and 2.25" (compound configuration)
stroke: 1.5"
(Discontinued?)

Triple-Expansion (Open Column Triple Launch - Triple Expansion)
Vertical Marine-Style Open-Column Engine
bores: 0.75", 1.25" and 1.75", stroke: 1", flywheel: 2.25"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/70

Double-Expansion (Open Column Twin Launch - Double Expansion)
While it does not appear on the regular Stuart website, a google search reveals a
No. 6A compound twin marine engine, bores 2.5" and 4", stroke 3".
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/57
I don't know if this engine is still available or not.

------------------------------------------------------------------------------
Beam Engines

Beam Engine
bore: 1", stroke: 2"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/43

Half-Beam Engine
bore: 1", stroke: 2"
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/45

Major Beam Engine
bore: 1.75", stroke: 3.75"
(This was the best looking of the beam engines.)
(Discontinued?)

------------------------------------------------------------------------------
Oscillator Type Engines
Stuart has a variety of small oscillators (not listed here).

------------------------------------------------------------------------------
Special Type Engines

No.1
A vertical, single-cylinder, open-column engine.
In my opinion, this was the best looking Stuart ever made.
(Discontinued?)

Sirius (Vertical Twin, Single-Acting, Enclosed)
bore: 1", stroke: 1"
This is a slick little Westinghouse-style engine, used to power a small genset during the war.
http://www.stationroadsteam.co.uk/Stuart/sirius.htm

Sun (Vertical Twin, Single-Acting, Enclosed)
bore: 0.75", stroke: 0.75"

James Coombes (Table Engine)
http://www.stuartmodels.com/inprod_det.cfm/section/casting/mod_id/48

800 Gas Engine
Real (Inverted Engine) (Inverted is my term)
4-leg open column engine, top mounted flywheel
bore: 1", stroke: 2"

Williams (Inverted Engine) (Inverted is my term)
Single column engine, top mounted flywheel
bore: 0.625", stroke: 1.125"

------------------------------------------------------------------------------





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Old 04-04-2012, 12:30 AM   #3
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Default Re: Stuart Turner Launch engine con rod.

welcome George nice to see you posting on hear,

Peter

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Old 04-04-2012, 07:12 AM   #4
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Default Re: Stuart Turner Launch engine con rod.

UNIcastings,
The engine is the Twin Launch engine of 1'Bore x 7/8" stroke which has the same con rods as the Compound engine I chose the Non condensing engine as it's self starting as the Compound isn't,
so a con rod from either would do.
I may have to fabricate one if non are available.
I have refrained from posting the engine progress as there has been postings before, however here are some pics of the modifications that I have made.
The bed plate on the engine is used as the bottom half of the 3- main bearings which I don't like so I used the top half of the bearing and made the bottom half from a piece of Cast Gunmetal, this means that the 5- columns have to be lengthened.

The eccentric sheaves are different as I have left flanges to give the eccentrics a bigger bearing surface.

The main shaft webs have been made like the balanced type webs.

To you and Peter thanks for the welcome.
A little about myself, retired design engineer , trained as a Millwright , never worked as a Journey man, straight into D.O. spent 20 years on design of textile machinery, 20 years on office and building refurb.
Never had the chance to do much machining but since retiral I have made all of the Stuart 10 engines and pumps and have experimented with Flash Steam in a model R.C. boat 42" long and have achieved 40 m.p.h with it, at present it's on the shelf as it's becoming too dangerous.
Limited machinery, lathe and mill drill.

Geo.

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Eccentrics on shaft..JPG   Main shaft :5.JPG  
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Old 04-04-2012, 12:16 PM   #5
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Default Re: Stuart Turner Launch engine con rod.

I don't know how badly you mangled the conrod, but you might try bending it back into shape and repairing it. I had an eccentric strap to the Stuart triple I'm currently making get torn free from the clamping fixture as I was performing final profiling, and I thought the part was beyond hope. I was able to bend it back into shape and complete the profiling. the finished part came out as perfectly as the others. Gunmetal bends very easily. If too much material got removed, you could silver solder a patch in place which when machined will probably become invisible.

I just checked Stuart's website. Though they have a number of spare parts for the two twin marine engines (which share most parts), they don't appear to have any spare conrods. Be aware that even if they did have spare parts, depending on the vintage of your casting kit, it is possible current spares may not fit your engine anyway. I recently acquired a 1960's twin launch casting kit, and there are a number of parts that are quite different to that of the twin launches sold up to about 6 months ago. Most of Stuart’s engines have changed (including dimensions) over the years.

If your conrod castings are the same as those that came with my twin kit, I can certainly understand how you damaged one, as they sure didn’t provide much in the way of holding spots to what is already a rather dainty casting that needs a lot of different machining. Having made the equally dainty conrods for my triple out of SS, I was very thankful to have started from bar stock which allowed me to machine from one end to the other in one clamping operation to virtually eliminate the risk of bending and so I didn’t lose any alignment or precision. I’m going to have to devise another method when it comes to the twin’s conrods.

Robin

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Old 04-04-2012, 12:25 PM   #6
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Default Re: Stuart Turner Launch engine con rod.

You should be able to make one from steel with bronze big end if you don't have any luck sourcing a casting, this will give you an idea of how to go about it.

http://modelengines.info/goldeng/const/rod.html

And this is a good guide to doing the cast one

http://compound.modelengines.info/rods.html

J

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Old 04-04-2012, 12:44 PM   #7
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Default Re: Stuart Turner Launch engine con rod.

Many thanks for your replies,
At last I have found a site where machinist can pass on their experiences to other members benefit.
I had already started thinking about a steel rod with bronze bearings which is now the road that I will go.
Some years ago I built a Reeves Borderer from scratch using bar stock , a lump of square cast iron window sash weight from a scrap yard( not to be recommended as they are very poor material ) and in this engine I made steel rods with bronze bearings.

So now armed with pics of "HOW TO" I shall keep you posted on my progress.

Pics of Reeeves Borderer.

Geo.

Attached Thumbnails
P:VALVE ENGINE 4.JPG   P: VALVE ENGINE 2.JPG   P:VALVE ENGINE 1.JPG  
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Old 04-04-2012, 05:01 PM   #8
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Default Re: Stuart Turner Launch engine con rod.

Robin,
The castings for this engine are very poor with quite a few blow holes in the castings.
As you can see from the pic of the reversing eccentric there is a small hole but not enough to worry about.
They could have left spigots on the castings as they do with the D10 & 10V and let you get a grip of them in the chuck.
The damage to the conrod was when I was coming back down to the bearing end and the tool dug in and the lot came out of the chuck.

However with the help of Jason's pics I have started the first new one in B.M.S.( swarf every where ) I'm good at making swarf. and the bearing will be in Phos Bronze.

George.

Attached Thumbnails
Con rod Damage:1.JPG   Eccentric with blow  hole.JPG  
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Old 04-05-2012, 08:42 PM   #9
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Default Re: Stuart Turner Launch engine con rod.

Hi George,
Nice to see you on here, this forum is streets ahead of the one we use to
belong to, with very knowledgeable and helpful engineers.

With regard to your eccentrics I had a similar problem on my launch engine so I machined mine from steel.

Mick


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Old 04-10-2012, 10:51 PM   #10
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Default Re: Stuart Turner Launch engine con rod.

Quote:
Originally Posted by Jasonb
You should be able to make one from steel with bronze big end if you don't have any luck sourcing a casting, this will give you an idea of how to go about it.

http://modelengines.info/goldeng/const/rod.html

And this is a good guide to doing the cast one

http://compound.modelengines.info/rods.html

J
Hi Guys,
Thanks for the input from Jason and others on holding and machining the con-rod from steel, here are pics of the nearly finished rod, just need to machine the bearing down to size.

Jason your pics of making your rods were very helpful on how to hold and machine .
Here is a pic of the first con-rod with gun metal bearing block which I was pleased with the result.
However I don't know whether I should post this here or in the BLUNDER SECTION

Does anybody see the Boo-Boo I must say that I feel a right EEJIT the cross head yoke is 90deg out from the rotation of the bearing.

Never mind I at least now know how to make them and hold them, back to the work shop.

George.



Attached Thumbnails
New conrod:1.JPG   New conrod:2.JPG  
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