Lower center of gravity helps balance and hips closer to the ground helps with change of direction irl. This is also why DBs cant be as tall as the WRs they cover. Tall RBs are usually at a disadvantage here and tend to use their shoulders more as hammers (a la Okoye). There are few exceptions to this rule.

As far as I can tell, height has no impact in this game, and weight is trivial. (Look out for those 200-pound nose tackles.)

I've heard people talk about smaller players getting hurt more...

After my last game, I'm back up to 13 injury designations, two of those being my two RB RBs. My two WR RBs are just fine and dandy. :')

I had an RB that I specifically left at FB in Paydirt for the first half of the season. At 243#, he still had 80+ SP and AC. He would definitely move the first tackler, but he generally played terrible. After moving him to RB, and he losing some pounds, he played better.

Basically all biomechanics in the game don't make sense ... still.

Wouldn't a player at 243# with 80+ SP and ACC be slower than one at 217# with 80# SP and ACC? Although I would expect a 243# player with those attributes to still run well. Furthermore, a 243# player running at full speed would be more difficult to tackle (all other factors being equal) than a 217# player running at the same raw speed - at least using a physics based approach.

One question which still puzzles me is the relationship between ACC and SP. Specifically, how long does it take a player to get up to full speed at various ACC levels. One would think that a 198# player with 100 SP/ACC would run a faster 40 yd dash than a 198# with 100 SP but only 50 ACC. But how much faster is the question. And would the same sized player with 50 SP and 100 ACC run the 40 yd dash just as quickly as the one with 100 SP and 50 ACC?

Speed is supposedly relative. Acceleration is the equalizer for heavier weight players.

Wouldn't acceleration also be relative? A lighter player will accelerate faster than a heavier player, though both players have the same acceleration value.

Not as far as I know in the game code.

Wow! So players with different weights but the same ACC will accelerate at the same rate until they get to their respective top speeds? I could see that happening in a very short race, e.g., 5 yards, where the difference in speed (or ground covered) would be minimal. But over a longer distance, e.g., 40 yards, you'd think that the lighter player would "out-accelerate" the heavier player and get to his top speed quicker.

A 300 pounder will max out with lower acceleration than a 200 pounder . Same for the fatigue hit it will incrementally hit the heavier guy more due to his weight . Acceleration is mostly used up by 2.5 yards . ...at 5 yards I value speed a bit more. Your talking 10 , 20, 30 and 40 yards . Probably need a really low acceleration rating to effect the players at those ranges . That's why you don't see any effect . Most of it is used up already.

I never even measured 40 yards . An electronic clock is needed and a combine but then we see how slow 80% of the player's are moving. You can put all the guys you want to "race" on kickoff and watch it in super slow motion . At different yard increments you can see guys different speeds.

You see the effects of speed, acceleration and weight , but nothing really moves more than 40 % . ....the fastest guy goes 10 yards and the slowest go 6 yards, but I didn't test guys under 60 speed . .....even if they had 93 acceleration they were still quite slow by then...only going 7 yards .

In the veiwer the guys with low acceleration seemed to delay right off the start, but like I said by 5 - 15 yards they were making pace or catching up to slower but quicker guys.

Its like an overweight DL converted to LB but he's stuck on 258 pounds and has 84 speed with 23 acceleration . Hes gonna be slow, but with enough running room he still run down 68 speed wr with 85 acceleration . The wr definitely will beat him in close space and in short routes but each cut depending how hard it is going to hurt the guy with low acceleration .