Durant Carlyle, on 29 November 2013 - 11:16 PM, said:
Let's look at the speeds and their relationships a minute, shall we?
The difference between the light and medium is 15 kph. Between medium and heavy is 18 kph. Between heavy and assault is 17 kph. Which one loses out on that exchange? The light. Which one gains the most? The medium.
At the speeds you listed, every 'Mech is viable except for the light. A light going 120 kph is a dead light. The speeds listed for the other three are pretty damn quick. I wouldn't hesitate to run those speeds in a medium, heavy, or assault. But that speed for a light? I wouldn't want to go that slow, unless there was a specific (very good) reason and I was on a team specifically built to take advantage of that. I have a hard enough time doing anything worthwhile at 152.7 kph in my Jenner. Going 120 kph would be a serious handicap.
Those differences are trivial. (A difference of 3 kph amounts to less than a 1 m/s difference). Also, refer back the first page. You'll notice that 35 ton mechs fall pretty close to the "ideal" line I threw in, so they're one of the groups that gain the least from engines under the current system. Assaults, in particular 90+ tonners, are the worst offenders.
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A question: Are the engine masses EXACTLY 30% of the tonnage of the 'Mechs? Engine weight granularity is confined to half-tons and full-tons. Some of them should be quarter-tons, so that could be throwing numbers off as well.
They're exactly 30% for the Jenner, Centurion and Atlas. It works out to 29.28% of the Cataphract's mass due to the granularity of engine weights.
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Maybe that's the inconsistency you're seeing. There are many possible reasons for it, but it wouldn't be fixed by having engines in lights and assaults give less kph per rating and engines in mediums and heavies give more kph per rating. How is doing that in any way consistent?
That [granularity of engine sizes] could definitely be an explanation. I haven't had the time to whip up a spreadsheet going over engine size vs weight though.
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By the way, your numbers are contradictory.
In one section you state that the Centurion gains 3.00 kph per rating when compared to the Atlas and the Jenner gains 2.76 kph per rating when compared to the Cataphract. That means the medium clearly is winning this comparison.
Yet your conclusion states that lights and assaults are winning the comparison and mediums and heavies are losing. Shouldn't ALL comparisons indicate that lights are winning, not just some of them?
The comparison in question sets off based on a different premise than the original in the OP. Originally I was talking about how much space a mech would need to hit a designated speed mark (based on mech weight). The example given was the inverse - how much speed do you get for a given weight?
Based on the granularity of engine sizes (mentioned above) it's possible that in this specific example there are margins of error to blame.
After running the numbers (below) I've come to a new conclusion.
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What about:
20 versus 40
25 versus 50
30 versus 60
40 versus 80
45 versus 90
I'm not running the numbers, but I'm sure somebody will.
Here's the numbers:
- 20 vs 40: 3.06
- 25 vs 50: 2.76
- 30 vs 60: 2.80
- 35 vs 70: 2.76
- 40 vs 80: 2.74
- 45 vs 90: 2.88
- 50 vs 100: 3.00
Based on this Mediums and Lights appear to be on pretty equal footing - when using an XL engine that accounts for 30% of their mass.
Kilrein, on 30 November 2013 - 05:39 AM, said:
This emphasis on speed is misleading because speed is being measured in kilometers per hour so the difference between 100 kph and 150 kph is seems pretty significant.
But in context of the actual battles, the difference is not that much once two units engage.
Relative differences translate directly into absolute values. If I say "mech 1 runs 1.5 X faster than mech 2" that is always true, no matter the units used. The point here isn't about the actual values, it's about the relationships between them. Specifically, that there should be a constant relationship between engine size and speed output but there isn't one.
Based on the numbers I ran for Thorq, there appears to be inconsistencies in the dataset. However, there is a good explanation for them:
- In the OP I analyzed how much of their mass a mech had to spend to hit a specific speed.
- In the examples on this page, we discussed how fast a mech goes when it spends 30% of its mass on engine.
"So why are the numbers inconsistent Art?" I hear you ask, "Aren't they essentially the same question phrased differently?"
The explanation for the inconsistencies is thus: in the OP, the engine sizes tended to be pretty huge (mediums used engines ranging from 330 to 355), while in the recent examples they were much smaller (mediums used engines ranging from 250 to 305).
So the answer lies in the weights of the heavier engines. Behold:
An important point to note: this graph does not account for HS requirements. Adding the HS requirements just makes the line much flatter at the beginning.
As you can easily see, there's exponential growth in engine weight at work - IE: heavier engines are disproportionately sized. Let's use this new information to look at the results in the OP, compared to the recent examples, once again:
To reach the optimal speed in the OP, mechs need:
- Lights: Engines Rated 190- 280
- Mediums: Engines Rated 330 - 355
- Heavies: Engines Rated 360 - 380
- Assaults: Engines Rated 360 - 395
In the previous "30%" Example, we were looking at:
- Lights: Engines Rated 195 - 235
- Mediums: Engines Rated 250 - 305
- Heavies: Engines Rated 315 - 350
- Assaults: Engines Rated 360 - 390
So! There appears to be a "break even" point somewhere along the engine continuum. After this point it becomes disproportionately heavy for Medium and Heavy mechs to carry large engines. More specifically, it seems that in order to reach "fast" speeds, Medium and Heavy mechs must carry large engines, but large engines have a diminishing return on investment. (IE: You go from paying 0.5 tons to gain 2 kph to paying 2.0 tons to gain 2 kph). This difference isn't as pronounced for Assault mechs because the differences between engine ratings are small.
For instance, increasing the Engine Rating (not weight) by 5 has the following effects:
- Lights: +3.38 kph [4.45 kph on 20 ton - 2.54 kph on 35 ton]
- Mediums: +1.90 kph [2.23 kph on 40 ton - 1.62 kph on 55 ton]
- Heavies: +1.33 kph [1.49 kph on 60 ton - 1.19 kph on 75 ton]
- Assaults: +0.9 kph [1.11 kph on 80 ton - 0.89 kph on 100 ton]
- Note: These values (roughly) account for speed tweak
But not all Engine Ratings of +5 are created equally - those at the lower end of the engine chart often cost the same (for instance, XL 150 - 170 engines all cost 4 tons) or have small difference, while those at the higher end of th engine chart have large differences (STD 360 -> 365 = 1.5 tons, 365 -> 370 = 2 tons).
This just re-inforces my original point however:
we need to have a consitent engine system. Even if there is only a narrow band of Engine Ratings that generate these strange results they need to be brought into line. As stated earlier in this thead, the engines that cause these inconsistencies tend to be the more frequent models on the field. How can we address these issues?
- By re-working the Engine Rating system so that we use a more diverse array of Engines on the field (instead of the current system where almost only light mechs will use sub-300 engines)
- By modifying the current system so that it is more consitent (going over the current engine weights and adjusting them so that they fit a consistent pattern).