timo
E-xcellent poster
Completing 3 1/2 Rainhill .Building 5" Railmotor and waiting to start 3 1/2" King
Posts: 234
|
Post by timo on Aug 19, 2019 18:57:36 GMT
Looking good!
Tim
|
|
|
Post by simplyloco on Aug 21, 2019 16:13:53 GMT
Backhead Bullshine!I hope that the original builder will not be spinning in his grave as a result of my handiwork... John DSC00221 by inkaboat, on Flickr DSC00222 by inkaboat, on Flickr
|
|
|
Post by jon38r80 on Aug 21, 2019 20:34:25 GMT
Very elegant!
|
|
|
Post by simplyloco on Aug 21, 2019 22:22:28 GMT
The gloss paint from Phoenix arrives tomorrow... John
|
|
|
Post by simplyloco on Aug 23, 2019 17:34:51 GMT
I had clean forgotten about my taking this picture at the NRM last year. I wish I had taken more... WP_20180919_10_50_06_Rich by inkaboat, on Flickr Onto more important issues! I was struggling to bend the 5/16" pipe into tight bends, and then I remembered microbore plumbing! I went to Screwfix and bought some 8mm end feed elbows, and once I have put a screwed coupling in by the blower to make assembly easier, then all will be well. We hope... John 20190823_172559 by inkaboat, on Flickr
|
|
timo
E-xcellent poster
Completing 3 1/2 Rainhill .Building 5" Railmotor and waiting to start 3 1/2" King
Posts: 234
|
Post by timo on Aug 23, 2019 18:18:39 GMT
Nice solution!
Tim
|
|
|
Post by simplyloco on Aug 24, 2019 22:28:19 GMT
More Legacy IssuesImagine my surprise, given the achingly beautiful splashers, to find that the dummy cab front I made wouldn't stand vertical because the rear sand box is overlong by 1/4"! Yes, I have checked the drawing and I will have to remove the sand boxes and get the hacksaw out... DSC00227 by inkaboat, on Flickr On a positive note, the smokebox connections went in a treat, screwing up by hand without any problem: the right angled spanner was not required. I changed sides as I remembered that I was right handed and I was dead lucky on this occasion... I'll make the blower tomorrow and we are almost in steam! John DSC00225 by inkaboat, on Flickr
|
|
jma1009
Elder Statesman
Posts: 5,901
|
Post by jma1009 on Aug 24, 2019 22:52:11 GMT
As per Brian's thread,
You could do with revisting the smokebox draughting, and it would not be too much trouble to make some superheater elements as well. The minimal effort involved would be well rewarded from a steaming point of view
As I commented awhile back, it seems to me the cylinders were added upside down, though I have not seen the Scarth drawings. If the cylinders were added the other way round and the exhaust underneath, you would obliviate the ridiculously short almost non existent blast pipe, that causes problems with the exhaust as it exits the blast nozzle trying to straighten what isn't straight.
Otherwise, great progress!
Cheers, Julian
|
|
uuu
Elder Statesman
your message here...
Posts: 2,816
|
Post by uuu on Aug 25, 2019 8:03:49 GMT
It's also pretty obvious that you'd get much better traction with more driven wheels. And the ones you have are just too big.
Wilf
|
|
|
Post by simplyloco on Aug 25, 2019 8:13:25 GMT
It's also pretty obvious that you'd get much better traction with more driven wheels. And the ones you have are just too big. Wilf
|
|
|
Post by simplyloco on Aug 25, 2019 17:01:56 GMT
Blower Not much done today, as I went to the Club this morning. Today I've made the 'Inkwell' and the cover in PB, and as I can't make out the blower jet details on the faded drawings, I'm using the Martin Evans details from his SS write up from 1986. I've made one blower jet with its 6BA tail, but the No. 78 drill went a little off centre -2500 rpm and thank goodness for my lever tailstock - so I will put that one down to experience and make four more a little more carefully! The brass nozzle came with the beast, so I've made provision for that to be screwed into the blower cover. The ID is 1/7th the cylinder diameter. While at the Club I looted a small amount of Welsh coal in anticipation of a steam up some time soon, and I also retrieved three litres of distilled water from my workshop AC! John DSC00230 by inkaboat, on Flickr
|
|
|
Post by qreidford on Aug 26, 2019 0:30:11 GMT
It's also pretty obvious that you'd get much better traction with more driven wheels. And the ones you have are just too big. Wilf Well, all I can say is that the larger wheels give more traction, in the ‘60’s in heavy snow a triumph 1300 front wheel drive with snow tires could not move but my, at that time girl friends 1947 MG TC with rear wheel drive, 19” wheels and skinny tires pulled away with no problems at all. Once the sensitive regulator is mastered it pulls away with no slippage at all and goes like the wind. Nuff said Cheers Q
|
|
|
Post by Roger on Aug 26, 2019 7:47:54 GMT
Well, all I can say is that the larger wheels give more traction, in the ‘60’s in heavy snow a triumph 1300 front wheel drive with snow tires could not move but my, at that time girl friends 1947 MG TC with rear wheel drive, 19” wheels and skinny tires pulled away with no problems at all. Once the sensitive regulator is mastered it pulls away with no slippage at all and goes like the wind. Nuff said Cheers Q I'm not at all sure that's right about wheel size and grip. A smaller diameter applies the force to a smaller patch of rail, reducing the chances of slipping. Modern locomotives have small wheels, presumably they would err towards larger ones if there was a benefit. I found this interesting article that seems to back this up.
|
|
|
Post by delaplume on Aug 26, 2019 9:31:16 GMT
'morning all--------Please guys let's not clutter - up this very interesting thread with repetition points-of-view re}--- wheel diameter / No. of wheels, traction etc.......Take it to another thread if you must continue....
Meanwhile John I was impressed with the apparent ease and overall neatness that came from using those commercial copper pipe items within the smokebox.............It's that old but well-proven adage that if it looks right it usually IS right that applies here I think ...
Best wishes for the inaugural steaming
Alan
|
|
Midland
Elder Statesman
Posts: 1,871
|
Post by Midland on Aug 26, 2019 10:05:54 GMT
[/quote]Well, all I can say is that the larger wheels give more traction, . . . Nuff said Cheers Q[/quote]
I think you have touched on one of the greatest of controversies of loco development over the years. I will not go into it as here are hundreds (thousands of books and papers written on the subject) except to mention that metallurgy was an infant science in those times and keeping the speed of the piston as low as possible was thought a good idea. As better metals were discovered, fast travelling pistons were accepted and here we are today! D
|
|
Midland
Elder Statesman
Posts: 1,871
|
Post by Midland on Aug 26, 2019 10:28:27 GMT
Some comments by Michael Reynolds, from "A Practical Manual for Engineers in change of Locomotive Engines" Eighth edition 1888. EXPRESS LOCOMOTIVE, BY MR. PATRICK STIRLING. The engine illustrated by Fig. 6f may be accepted, by reason of its dimensions and the work it performs, as ably representing a good type of an English single engine. The cylinders are 18 inches by 28 inches, and the driving-wheel is 8 feet in diameter. Engines of this class run from London to Grantham, with the steam on, a distance of 105 miles, and, as Mr. John Hollingshead says in one of his " Odd Journeys,", drag us "out of the sunlight into the mist, again out of the mist into the sunlight, past undulating parks rich with the red-brown tints of autumn ; past quiet pools and churches in among the hills ; past solitary signalmen and side stations, where weary engines rest from their labours ; past hurrying trains, with a crash and a whirl, and away." The above is the longest daily run without a stop, made in England; performed day after day with complete success, much to the satisfaction of the " gods " who are in a constant state of migration between the Tweed and the Thames, and who enjoy a bold bit of enginemanship. The service done by these engines is well done, and the trains they work are very popular. The impression made by one of these beautiful mechanical constructions upon any observer is one of admiration. Few indeed could withhold from it the praise due to a piece of work which is considered by well-qualified judges and by people of taste and authority to be a masterpiece. It has marks of the " go" about it, and is really a fine engine. Stirling Single by David Goyder, on Flickr Cheers D
|
|
|
Post by ettingtonliam on Aug 26, 2019 10:29:19 GMT
I think Wilf was being ironic, following Julian's comments which seemed to suggest major redesigns for the cylinders and draughting, so lets not get carried away, and let SimplyLoco get on with his saga about the lovely Stirling Single.
|
|
|
Post by simplyloco on Aug 26, 2019 16:00:56 GMT
Blower CompletedI've only been in my workshop today because it is SOOO much cooler in there! The blower is quite elevated, and I've calculated that five degrees inclination means the blast coincides about 3/4 of the way up the very tall chimney. That should do the trick! DSC00236 by inkaboat, on Flickr Blower Jet holes are only 0.017" diameter and were drilled on the Emco lathe without fuss or bother. I have made the blower pipe but I've had enough today! DSC00240 by inkaboat, on Flickr Forming the blower jet nose DSC00228 by inkaboat, on Flickr Using the magic Proxxon to spot face, drill and tap the 6BA holes at 5 degrees. DSC00232 by inkaboat, on Flickr Prepping the two parts with solder paste. THE most expensive joint in the world, but worth every cent! DSC00233 by inkaboat, on Flickr I'm getting quite used to these ER collets! Next job will be the drag beam connections. John DSC00234 by inkaboat, on Flickr
|
|
|
Post by simplyloco on Aug 26, 2019 19:04:21 GMT
Please guys let's not clutter - up this very interesting thread SNIP Best wishes for the inaugural steaming Alan Thank you Alan for your support: I will wear it whenever I feel the need... The interest in the Singles is certainly there: in just over five weeks this thread has received over 7500 views! Long may it continue... John
|
|
jma1009
Elder Statesman
Posts: 5,901
|
Post by jma1009 on Aug 26, 2019 22:39:09 GMT
I think Wilf was being ironic, following Julian's comments Wilf wasn't being 'ironic'; he was being sarcastic. I hope John's 5 degrees inclination of the blower jets is proven. A good test is to try the blower ring with nozzles on a boiler test rig and see where the jets of water meet. I was rather hoping that John would reconsider the smokebox draughting arrangement, and the matter of superheaters. I am happy to help if provided with all the relevant dimensions. Roger went into all this in some detail with his 'Speedy'. It is a fallacy to assume what is made up on paper as a drawing for a loco is optimal, as John's friend David (Midland) will hopefully confirm with many valve gear discussions a few years ago, and a few of us running things on valve gear simulators. The same applies to smokebox draughting. I am a great fan of single driving wheel locos, and my next loco will be a 2-2-2 loco, of Isle of Wight origin. Wilf please note! Cheers, Julian
|
|