Then, only then, I realized my Pixel 4a shows inclination with respect to horizontal when taking a picture: I gave it a try and it seems precise enough for the purpose (i.e. having the rail angle somewhere between 1 and 2 degrees forward with respect to horizontal). So I kind of validated the numbers I see.

I have a spreadsheet where you can input:

- the measured Hrear and Hfront, the height of the rail (from the floor to the top of the rail) at beginning and end of the rail (where the shiny rail gets covered by plastic bits).
- the measured L, the rail length between the two points you measured the height at.
- the measured D, the distance between the mid-point of the rear feet and forward feet
- the measured H, how much you must raise the front to have the rail perfectly horizontal (easy to find with with a bubble level)

On my RowErg (std legs, so should be the same as a model D):

- Hrear = 307mm, Hfront = 278mm. These should be the same on all RowErgs std legs and model Ds.
- L = 1200mm. These should be the same on all RowErgs std legs and model Ds (if you measure where I measure).
- D = 2245mm. These should be the same on all RowErgs std legs and model Ds, probably also RowErgs tall legs and model Es.
- H = 70mm. This depends on the slope of your floor. If your floor is horizontal, this will be something like 54mm.
- Hc = 15.7mm. This depends on the slope of your floor. If your floor is horizontal (H roughly 54mm), this will be 0.0mm.

If the extra work you do due to that is totally wasted (let's assume, not sure how valid that is) it's possible to compute how much work you have wasted and also how much power.

I took my 72Kg, but only considered 47.5Kg (I've found somewhere each leg is typically 16% of the total body weight, let's say legs are not lifted more due to slope).

The for each one of my PBs (500/1k/2k/5k/10k/HM/FM) the c2 logbook gives the the avg pace and hence avg power, plus I can compute the avg stroke rate and use all these to compute the power I wasted (power I produced that didn't went into the erg) and the potential avg pace (so also the overall time) that I would have done if no wastage had occurred (i.e. if the rail had the correct slope). Here are the numbers:

Code: Select all

```
T Strokes SR Pace P E_Lost P_Lost P_eq Pace_eq T_eq
Event hh:mm:ss.d [-] [-/m] m:ss.d [W] [J] [W] [W] m:ss.d hh:mm:ss.d
500 00:01:36.6 62 38.51 1:36.6 388.27 97.42 1.01 389.28 1:36.5 00:01:36.5
1000 00:03:31.8 121 34.28 1:45.9 294.70 190.12 0.90 295.60 1:45.8 00:03:31.6
2000 00:07:24.2 224 30.26 1:51.1 255.57 351.95 0.79 256.36 1:50.9 00:07:23.7
5000 00:19:21.7 543 28.05 1:56.2 223.25 853.17 0.73 223.98 1:56.0 00:19:20.4
10000 00:39:48.5 1060 26.63 1:59.4 205.49 1665.50 0.70 206.18 1:59.3 00:39:45.8
21097 01:26:04.6 2232 25.93 2:02.4 190.86 3506.97 0.68 191.54 2:02.3 01:25:58.5
42195 03:00:24.1 4482 24.84 2:08.3 165.87 7042.22 0.65 166.52 2:08.1 03:00:10.0
```