Jonny5salive Posted November 23, 2016 Share Posted November 23, 2016 Hi just tested my Hornby 08 shunter called (John) , fitted with sapphire decoder and mine took 6 seconds to cover 1ft . Link to comment Share on other sites More sharing options...
LCDR Posted November 23, 2016 Share Posted November 23, 2016 Hump shunting was usually performed at less than 2 mph. The 08 class were geared especially for this and had a large speedometer to help the driver control his speed. This ensured that 'cuts' of wagons did not catch up the one in front before they reached the points which diverted each cut into a different siding.The main line classes used for Merry-go-Round especially classes 47, 56, 58 and 60 were fitted with 'slow speed control' that regulated the speed to 0.5 mph for loading and discharging. Link to comment Share on other sites More sharing options...
walkingthedog Posted November 23, 2016 Share Posted November 23, 2016 I have a Dapol J94 that took several minutes to travel a foot when I first purchased it. Gaugemaster controller, 12v DC. Nothing new in that I'm afraid. Link to comment Share on other sites More sharing options...
Howbi Posted November 23, 2016 Share Posted November 23, 2016 this is an excellent Hornby Dublo layout hump shunting demonstration....... HB Link to comment Share on other sites More sharing options...
LCDR Posted November 23, 2016 Share Posted November 23, 2016 That is an interesting demonstration, the principle is absolutely spot on, the automatic uncoupler being something not achieved by BR. How it works in the real world is that the train arrives in a 'reception' siding. After the wagons were secured by hand brakes the train loco was released and went away either to shed or to work another train. The wagon destinations are identified by the shunting staff. Before TOPS this information was obtained from wagon labels, but after TOPS was introduced a 'consist' was sent via the computer. The information was sent to the control tower where the 'cut list' was compiled. The 'cut list' was a script for the operator telling him which wagon was to go in which siding. The tower operator/controller operated the points between each 'cut'. In modern systems the cut list was used to programme a computer which detected the wagons or cuts and operated the points automatically. The train was divided into cuts by the shunters by uncoupling and each wagon or separate group of wagons was called a 'cut'. A hump engine arrived on the rear. As soon as the tower operator/controller was ready, the hand brakes were released and the hump engine started to propel the train up over the hump. As the wagons passed over the hump gravity took over. The wagons speeded up and ran down the gradient into the sidings. The loco propelled the train steadily and continuously at less than 2 mph. Radio contact was maintained between the driver and tower operator/controller, in case the wagon didn't run or became derailed. There was also a signal at the hump top which would go to danger if needed. (Belt and Braces) In the old days the points were operated purely by the tower operator/controller observing the cuts as they ran. The shunters will have chalked siding numbers on the wagon ends. Modern yards had track circuits to detect the wagons and the points were operated by a computer. An accurate cut list was essential. Electrical or pneumatic operation of the points was essential too. To prevent wagons entering sidings too fast and hitting others already there too hard, devices called retarders were provided. These gripped the wheels as the wagons passed and applied braking force. Only wagons running too quickly were slowed, the retarders were not applied to slow ones. In the old days again it was purely the judgement of the tower operator on how much force was applied, but in modern yards track circuits and doppler radar was useed to see how fast or slow a wagon was moving, and the retarders operated automatically. A few yards were fitted with Dowty retarders. Instead if gripping the wheels these were hydraulic pistons that had to be depressed by the wagon wheels as it passed. At Tinsley we also had retarder/boosters that used the pistons not only to retard the wagon, but to boost it if it wasn't going fast enough. Link to comment Share on other sites More sharing options...
LCDR Posted November 23, 2016 Share Posted November 23, 2016 Why has my latest post been held for moderation? Link to comment Share on other sites More sharing options...
Gordonvale Posted November 23, 2016 Share Posted November 23, 2016 4mm to the foot is 76.2 76 is something to do with trombones and parades. Link to comment Share on other sites More sharing options...
LCDR Posted November 23, 2016 Share Posted November 23, 2016 So how much difference will that 0.2 make? Link to comment Share on other sites More sharing options...
Gordonvale Posted November 23, 2016 Share Posted November 23, 2016 That's a bit tough LC&DR. It's 7am in my house. The answer is 76.2 is 0.263157894736842% biggerer than 76 or 76 is 0.26246719160105% smallerer than 76.2 PS. I used a calculator. Link to comment Share on other sites More sharing options...
81F Posted November 24, 2016 Share Posted November 24, 2016 I guess this next video won't be popular with some but here's the Hornby 0-4-0 'Pocket Rocket' doing timed laps to work out its scale speed. WARNING- THIS VIDEO CONTAINS GRAPHIC FOOTAGE OF A MODEL TRAIN GOING AT AN UNREALISTICALLY HIGH SPEED! This one really would have done an awful lot faster on a straight! In my youth I timed one of the original Hornby GWR 101 loco's (same mechanism as your Caley pug) at approximately 26 inches/second, so in all imperial terms at 00 this equates to: 26 x 76 = 1976 inches/s (divide by 12 to get feet/second)1976/12 = 164.6667 ft/s (multiply by 3600, the number of seconds in an hour)164.6667 x 3600 = 592,800 ft/h (divide by 5280, the number of feet in a mile)592800/5280 = 112.27mph, but this was timed on the second hand of a wind up watch and included time to accellerate Having said that these little fellows were fitted with the same motors at the scalectric racing cars so what do you expect! Link to comment Share on other sites More sharing options...
LCDR Posted November 24, 2016 Share Posted November 24, 2016 That's a bit tough LC&DR. It's 7am in my house. The answer is 76.2 is 0.263157894736842% biggerer than 76 or 76 is 0.26246719160105% smallerer than 76.2 PS. I used a calculator.I didn't! And it is now 8:21 am. Link to comment Share on other sites More sharing options...
LCDR Posted November 24, 2016 Share Posted November 24, 2016 The preceding post was meant to comment on the video of the Hornby Dublo layout. A very good demonstration by the way. However it got hijacked by the profanity filter. Don't ask me why, I cannot understand it either even after it was explained to me. Some words must have a meaning that I don't understand and are not so defined in the Oxford English Dictionary. It is probably an American definition, they have some peculiar expressions, and spell words in a funny way, as well as driving on the wrong side of the road!! 😀 Link to comment Share on other sites More sharing options...
walkingthedog Posted November 24, 2016 Share Posted November 24, 2016 I used the slang for cigarette beginning with f the other day and it was stopped by the profanity filter. Link to comment Share on other sites More sharing options...
LCDR Posted November 24, 2016 Share Posted November 24, 2016 The people who write these filters must live in a very different world to mine. Link to comment Share on other sites More sharing options...
walkingthedog Posted November 24, 2016 Share Posted November 24, 2016 And mine LC. It is very annoying when a well known slang word used to describe a cigarette or a junior pupil in a public school, that has been in use for decades, is considered a profanity because North Americans decided in their wisdom to use it for something else. That's their problem not ours. Link to comment Share on other sites More sharing options...
LCDR Posted November 24, 2016 Share Posted November 24, 2016 Yes words meaning happy or jolly, and an embankment holding back water/channel or ditch for draining a fen, seem to have been hijacked too, amongst others. Sad really. Link to comment Share on other sites More sharing options...
Bulver Posted November 24, 2016 Share Posted November 24, 2016 Really enjoyed the video from Chris and his son, very informative. Also, Howbinman's HD video was really great. Most impressed with the speed control and points operation, with the uncouplers as well. considering the age of those models, I found the running quality looked fantastic, and the 'hump' procedures were fascinating to watch. Rod Link to comment Share on other sites More sharing options...
Chris and Archie Posted November 26, 2016 Author Share Posted November 26, 2016 Thannk you for the positive feedback, I'm very glad to have provoked so much debate on the topic. It was only after I'd filmed our piece that I tried looking up "scale miles per hour" on youtube and found very little had been studied before.... Cheers Chris & Archie Link to comment Share on other sites More sharing options...
81F Posted November 30, 2016 Share Posted November 30, 2016 The people who write these filters must live in a very different world to mine.I think they must be American as the slang for cigarette is used as an insult in the state Link to comment Share on other sites More sharing options...
walkingthedog Posted November 30, 2016 Share Posted November 30, 2016 Yes I know what it refers to in the USA but this ain't the USA it's the UK. It's time our lives weren't controlled by them, very annoying. 🫨 Link to comment Share on other sites More sharing options...
LCDR Posted November 30, 2016 Share Posted November 30, 2016 Never has there been two nations so divided by a single language! Link to comment Share on other sites More sharing options...
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