Started by fam621, November 16, 2017, 08:14:58 PM
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Quote from: thegamer7893 on April 06, 2019, 10:12:03 PMAbout the acceleration rate thing, did you say that you wanted the acceleration rate in horsepower, because I found the horsepower for the class 800s on wiki. and the horsepower is 750 (560 kW) per engine (for I assume diesel).
Quote from: jamespetts on April 06, 2019, 10:32:17 PMThe power is easy to find - it is the tractive effort that governs acceleration and that is hard to find (as discussed extensively above).
Quote from: thegamer7893 on April 11, 2019, 03:27:39 PMJames, how did you find the tractive effort for the other trains in Simutrans?
Quote from: jamespetts on April 11, 2019, 03:42:28 PMIf they were not available on Wikipedia or another source, I had to guess based on extrapolating from other locomotives or multiple units whose tractive effort is known. Generally, it is easy to find the tractive effort of locomotives, but difficult to find the tractive effort of multiple units. I believe that I did manage to find somewhere the tractive effort for some of the "Desiro" series of multiple units (the class 450, etc.), but I could not find it for many other units, and had to extrapolate many of the other modern units from this.
Quote from: Freahk on September 14, 2019, 07:09:32 PMWiki states that it has an acceleration of 0.7m/s² and a weight of 243t (5 cars set) or 438t (9 cars set)As 1N:=1kg*m/s², this results in a tractive effort of 243000kg*0.7m/s²=170kN (5 cars set)438000kg*0.7m/s²=307kN (9 cars set)Could not find acceleration data nor weight for class 801Please let me know for which trains you need tractive effort, maybe I can assist in this.Edit: forgot to mention about brake force.As Wiki states class 800 has a deceleration of 1m/s² in service, or 1.2m/s² in ermergency, this would result in243kN or 292kN (5 cars set)438kN or 526 kN (9 cars set)Only thing you have to do now is calculate it down to single cars as I don't know how the engines are spread over the train.
Quote from: jamespetts on September 22, 2019, 02:54:39 PMFreahk - thank you for this: this is most useful.As you may be aware, we do not have any means of simulating bi-mode traction in the game at present, so the class 800 represents this as a diesel train and the class 801 represents this as an electric train. In reality, these are almost identical save that the class 801 has fewer diesel motor cars. The Wikipedia article does not specify whether the acceleration rate given is for diesel or electric power, and I suspect the latter. I have thus adjusted the class 801's tractive effort accordingly, and used a guessed figure for the 800 (being the previous figure for the 801). I have also updated the brake force based on your calculations and corrected the weight.If you are able to extrapolate the correct tractive effort for any other multiple unit aside from the Desiro series, that would be very helpful, as that is the only unit for which I have actual tractive effort figures, I believe (I have a vague recollection that I might have a tractive effort figure somewhere for a much older electric multiple unit, but I cannot be sure now and I cannot remember which). Likewise, if you are able to calculate the brake force for any modern multiple units, that would be most helpful. For reference, we use the maximum service braking rate in the game, not the emergency rate.
Quote from: Freahk on September 26, 2019, 08:46:50 PMSorry but you are wrong.Class 801 is only in service at electrified tracks but in fact, the 5 car trains and the 9 car trains, both do have one (instead of 3 or 5 in case of class 800) diesel motors installed, allowing them to continue their journey at very limited speed and providing electrical energy e.g. for light using the installed 580 kW diesel generator, which is installed under the second last car, in case tracks electrification fails.
Quote from: thegamer7893 on November 16, 2017, 08:14:58 PMHello James, I have just finished playing Simutrans and I notice that the class 801 has better acceleration the the class 800 and for some reason they are not livery variant so what I mean is that the class 800 should be able to have the Virgin Trains livery and also to have the same acceleration rate as its no different in real life whether its on diesel or electric. So can that be a possible fix please?
QuoteDiesel engine has correct power 700 kW
Quote from: jamespetts on May 25, 2020, 12:52:00 PMFor the tractive effort, may I ask how you are calculating this;
Quote from: Freahk on May 25, 2020, 02:07:39 PMF=m*a or in units 1N=1kg*1m/s²
Quote from: jamespetts on May 25, 2020, 04:11:53 PMit is good to know that the physics engine works as intended!
Quote from: Freahk on May 25, 2020, 05:03:30 PMWell, apart from serious rounding troubles at low power, force or speeds at least.The physics engine is quite impressive anyways.
Quote from: jamespetts on May 25, 2020, 04:11:53 PMThat is helpful - it is good to know that the physics engine works as intended!
Quote from: Vladki on May 25, 2020, 06:25:25 PMClearly the performance on diesel is worse...