DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Apr 4, 2007 17:12:53 GMT
Seems possible it's the Richmond road, and I know of the area in question. If not, might it be a 'count-down' board? If so, is it likely the Wimbo road EB?
/Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Feb 2, 2007 23:46:12 GMT
Thanks Colin - I stand corrected! I was at work without benefit of my stack of diagrams and mis-remembered the number. Ironic, as I was recently fixing the 2 roads I alluded to in the virtual rendition. I still feel that's the location. I believe those 2 roads are used infrequently, and the rusty look suggests so.
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Feb 2, 2007 17:32:30 GMT
Looks to me like ECMDT, I think Road 26 (one of the 2 roads behind ECM EB pfm). I can see the wire fence in the background, and what I think is Roads 19/20 leading off to the right past what I think is the E end shunter cabin. Shot likely taken from the EB ECM pfm. I also know there are 2 sectionalization boxes at that location. To the right (behind the light pole) is (I think) the E end exit road onto the main lines.
/Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Oct 17, 2006 1:13:35 GMT
With appropriate humility I retract my earlier answer. I was focusing on speed not force. It will indeed take off normally, however wheel speed will be approx. twice groundspeed. I found this explanation most clear: ooine.com/index.cfm?commentID=154I mentally set up the required condition in 2 steps to see the effect. First, hold the plane still (e.g. hold the wings). Brakes are off. Crank up the belt to 20mph. Plane motionless (we're holding it still), wheel speed 20mph (assumes good tire/belt friction and zero wheel bearing friction). Now release the plane and add enough power for 20mph ground speed. At this point conditions are met - plane speed = 20, belt speed = -20, but wheel speed = 40. Plane is moving ahead at 20mph. Continue accel to V1 (or V2+10 for safety) - say 130 for a 737. Now plane speed = 130, belt = -130, wheel speed = 260. Liftoff. It's the force that matters. The belt is irrelevant, other than it roughly doubles the wheelspeed. I think.
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Oct 16, 2006 14:04:36 GMT
Exactly. The only thing this will accomplish is to wear out the tyres. There is zero relative wind over the wings. Try flying with a tailwind equivalent to your groundspeed. You will fly exactly the way a brick doesn't.
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Oct 10, 2006 0:19:16 GMT
Hee hee - fun though! I was clearly reading too much into 'double green' and thus too many 'parks'. You just happend to pick some trackage with which I have familiarity. Anywhere else on the Combine and I'm lost. Except for the 'green bits' ;D
Nice one!
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Oct 10, 2006 0:02:14 GMT
Not sure if this is right, but it seems to fit...
GUNNERSBURY TURNHAM GREEN RAVENSCOURT PK HYDE PARK CORNER GREEN PARK (REVERSE) RAVENSCOURT PK ACTON TOWN (CHANGE) EALING COMMON PARK ROYAL SUDBURY TOWN (END)
Not sure where you chaged from Green to Blue on the East, however (assuming my guess of Green Pk is right).
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Oct 2, 2006 22:46:16 GMT
Is it not out of guague without the cutout? My thought exactly. For reference, here's an SSL loading gauge diagram. No mention is made of vertical clearance, however. Presumably it must be checked against structures on the line(s) it is intended to run on. Compare to Tube Stocks:
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Sept 2, 2006 16:02:29 GMT
Well done gentlemen - it was a shot from the rear cab. PGB deserves at least an honorable mention as he had the right idea, but I could not in true honesty credit him with the right answer. I was puzzled when I first saw the photo as I wasn't aware a Speedo would read "in reverse" (thinking, naively, that it was a mechanical rather than electrical feed). My thanks for the explanation, and photo credit, to PP.
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Sept 2, 2006 2:35:53 GMT
A total guess. A cab end in the middle of the train? And a good guess, as there were a number of double-bubble 73s. But not correct. I'll leave it a bit longer for the morning (UK) folks to try...
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Sept 1, 2006 22:38:57 GMT
Ponder the photo of an unrefurb 73TS cab Operator's desk shown below: The CTBC is in 'Shutdown', no key in the Selector, yet the Speedometer shows 30mph. How? (I suspect the professionals on the forum will twig very quickly, so please give the other folks a shot before pouncing ;D)
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Jun 7, 2006 0:37:50 GMT
Sorry Chris - I was just lucky you showed part of the combine that I have a special interest in ;D I was 'driving' that area last night... Of course, there could be a similar passenger bridge elsewhere I'm unaware of, but it looked prety distinctive.
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Jun 7, 2006 0:24:58 GMT
Looks to me like Acton Town.
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Apr 27, 2006 23:32:38 GMT
Just a SWAG... Given the painted line, I'd guess it's just behind the nearside Operator's sliding door. Could it be related to CSDE detection or automated stopping mark detection? If so, it would be the stock used to test that aparatus? /Jimi (thumbing throug his stock reference books...)
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Apr 11, 2006 21:48:12 GMT
...May I apologise to any Metropolitan or District aficionados who may have stumbled across this thread and who have probably had the pants bored off of them by now. Anything but! A truly fascinating thread. I recently obtained a bunch of 'old' books, among which was John Glover's "London's Underground" and JG Bruce's "LU Tube Stock". Some of what you spoke of was also discussed in there. Personally I greatly enjoy discovering the history, especially the engineering and technical side. Thank you! /Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Friday
Mar 6, 2006 15:00:30 GMT
Post by DrJimi on Mar 6, 2006 15:00:30 GMT
...However, the weeds in the foreground do look like something that was used by DrJimi in his District line sim... I confess I'm delighted that someone would notice such detail. Sadly, I can not establish the true provenance of the weeds I'm using. Thus it is unclear whether they are original District weeds or are originally from some other part of the combine On a more serious note, I find these photo quizzes fascinating and greatly enjoy seeing them each day. I don't stand a <pick favorite epithet> of getting the answers but am in awe of those of you who display such encyclopedic knowledge. Well, I did get all Alan's District ones right, but I guess I should ;D Best, Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Dec 16, 2006 16:15:43 GMT
Of course you now have me wondering if I could create an animated version of this in TSM or more likely 3D Canvas. To me the shape and operation is visually enchanting and at the same time so Heath-Robinson (or Rube Goldberg for us US folks). Has anyone build one from Lego? ;D
/Jimi (3D primitive distorter at large)
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Apr 18, 2005 2:34:11 GMT
Great reading - thanks PP!
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Jan 30, 2008 3:33:25 GMT
Not an exact rendition of the real thing, but way closer than the previous version. I know of at least 3 errors, forced on me by available track sections and 'space'. But I hope it captures the spirit. You can see my test D78 about to leave 19 Acton road. Lots of new rail in there (UKFS) which via a 'magic process' is soon to become true 4th rail. Meanwhile, we've also extended the line from West Ken and built all new trackword to OLY, FBY (heading to WIM), ECT, HSK (heading to ERD), and GRD. Goal is to complete the Wimbleware road for the next release. Best, Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Mar 1, 2008 21:06:36 GMT
AS I'll be implementing advanced lighting and 'change ends' (cabs), it will need Bin V1.7 or later (exact BIN version we test with will be noted in the release info).
/Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Jan 16, 2008 20:52:45 GMT
UPDATE Darren's still working on the cab for Sarah, and passed me these new renders. Enjoy... And for those who missed the screenshots of the loco in MSTS... Our thanks to everyone who has contributed photos (old and new) and first hand knowledge and recollections to help us create this. More news as it happens. Best, Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Dec 28, 2007 17:05:53 GMT
You also need the D78 (unrefurbed) stock as many of the activities use it. Mandatory stocks are the 73TS (unref), the 73TS V1.1 update and the unref D78. Those are used by the scenarios. Any other stocks can be added as desired. Make sure you have those that are needed. If you still have issues, let me know the exact error you are seeing and I'll diagnose.
/Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Jan 30, 2008 3:00:59 GMT
You last received a reply barely 9 days ago. No news usually means the developer is busy working, and will surely be proud to show something new when it's ready. Hounding developers for 'news' is likely to annoy them and will not produce results any faster. Patience is rewarded.
/Jimi (MSTS route developer with related scar tissue)
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Nov 28, 2007 22:36:25 GMT
Solidbond's "Connect" mug sure gets around
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Dec 8, 2007 15:16:58 GMT
Thank you again! I can certainly model to those max deceleration rates, and I'll check my notes on that brake control equipment. Thanks to your PM'd diagram I located the info re the Met locos in WA Agnew Vol 2. I will read further and take notes!
Thanks, Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Dec 8, 2007 0:34:42 GMT
Exactly what I was looking for - thank you TubePrune! That confirms the 1200hp total (max) I had read elsewhere. I'll try with a nominal 900hp to fine-tune the physics. Armed with all that data I can convert to SI units and determine Max force (kN), etc. and now knowing the weight I can figure the inertia/momentum/rail friction and figure the Davis equation values.
Would you know if the control system is similar to, say, the Battery loco controller and resistance grid (i.e no RPA nor notching relays, etc.)? Does #12 by now have Windyhouse or an earlier brake system? Any idea of brake force or G-force deceleration would also be useful (or anecdotal 'it can stop from XXmph in XX metres/furlongs/rods/poles/perches')?
Thanks again - we always try for accuracy in our models. This has helped greatly.
EDIT: from the above (converting to SI), 61.5 short tons = 55.8t (metric). It appears we have total motor power of 670KW, and the TE would require a force of 124kN (at 0.553m wheel radius and 23:57 gear ratio). Gears provide about 2.5 times torque multiplication. I supply MSTS physics specs with power, force and wheel radius. Off to edit and test. I bet I can get wheel slip...
Best regards, Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Dec 7, 2007 2:56:17 GMT
Apologies for the late reply - been busy with the new RailSim. Artery - Track walk? As in checking for clearance? If so, yes. We're also in process of re-laying all route tracks with real 3D 4-rail trackwork, more realistic points, and all new tracks east of West Ken. As part of that I'm checking for clearance and adjusting bridges, platforms, etc.
TubePrune - I realized shortly after I posted that I have 1 coach too few. The released consist will be accurate. I regret I'm unfamiliar with Dreadnoughts but will research. Our intent is to have very detailed 3D cabs at each end, and maybe also model the interior (battery area, etc.) to some degree. With the planned RailSim version we can have a real 3D cab and can look around it (and thus see through the cab back wall door). We will also be able to "change ends" thus driving from either cab.
Thank you all for your interest! If anyone has any releated refernce material regarding the control/motoring/braking systems, loco weight, power, etc. I'd greatly appreciate it. Also any photos of the cab and its internals would greatly help Darren get his cab model accurate. We're putting a lot of effort into this one and hope to do justice to this fine loco.
Thanks, Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Nov 28, 2007 17:24:14 GMT
The team has always wanted to try and replicate this loco: Here's a couple of screenshots of our version road testing on the DR: APPROACHING ACTON TOWN FROM SOUTH EALING AS A COCKFOSTERS 73TS WAITS ON THE BANK 1200HP PULLING 3 BEAUTIFUL MAROON MK1 COACHES (COURTESY OF IAN) AN ATTEMPT TO REPLICATE THE PREVIOUS REAL PHOTO - PASSING CHISWICK PARK AS THE 73TS OVERTAKES You must have had a great view of that Doc! More news as it happens. /Jimi
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Oct 26, 2007 1:45:35 GMT
Strangely, I'm enjoying the irony of BVE featuring cabs built for MSTS ;D Nice job guys!
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DrJimi
Virtual District Line construction engineer and arborist
Posts: 365
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Post by DrJimi on Oct 19, 2007 0:06:07 GMT
Available shortly on UKTS - see here: forums.uktrainsim.com/viewtopic.php?f=260&t=75453and shortly thereafter on TrainSim.com. Thank you to everyone who provided information and other assistance that helped us get this done -- there were many of you! Enjoy, Jimi
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