Weight adjustment for boat types other than eights?

[Ted209]

Hey all, I notice the weight adjustment calculator on this site adjusts your weight for the speed of an eight.
I was wondering if it was at all possible to somehow make an adjustment to this time so that it also adjusted for other boat classes, e.g. a 2-

Thanks

[jamesg]

This can only be empirical. Erg times are supposed to equate to the same people in a 4-. Quads and eights will be faster, doubles about the same, pairs and singles slower. IF the people aboard can row.

A 2k in a single took me about 9 minutes when I could erg it in 7, and me in a pair would be just as slow.

[ArmandoChavezUNC]

Erg score equates to a 4-, not an 8+.

Also, it's predicated on perfect form.

Don't put too much stock on it.

[Nosmo]

this chart is a more sophisticated analysis then the simple weight formula from concept II:
http://biorow.com/RBN_en_2007_files/App ... News08.pdf
But sophisticated doesn't necessarily mean significantly more accurate, or more accurate at all in any individual case.

As Armodo said, don't put too much stock in it.


If the boats are ideally designed for the weight crew, a simple theory shows that all things being equal a boat with twice the number of rowers of equal power will be 8% faster. This is based on having the power double but the drag increase by the weight to the 2/3 power (i.e. by 58.7%).
So a 1x is 8% slower then a 2x, which is 8% slower then a 4x.
Similarly a 2- is 8% slower then a 4-. An 8- would also be 8% slower then a 4-, so for an 8+ (or 4+) you would just compensate by adding the weight of the coxswain (i.e. how much slower the coxed/vs non-coxes boat is depends on the weight of the crew and the coxswain.)

Also when using any formula you should add about 30 lbs for the weight of the boat rather then just using the weight of the rower.

Also a smaller boat will be relatively slower in rough conditions, but also technique make more of a difference in rough water then in flat.

Again don't put too much stock in any any of this.

[Rockin Roland]

Now if you had a Rowperfect erg (indoor sculler model) then you'd have the luxury of selecting the boat type (4-, 8+, 1X etc) depending on how fast you wanted your 500m splits to be. At the same time you can imput your weight into the monitor so that it weight adjusts your score automatically.

I doubt if C2 would introduce the same features on future monitors because it would stuff up their online ranking system with too many boat and weight categories to account for.

[millzeee]

@jamesg et al.,

Are you comments based on the old Concept2 weight adjustment of 170 lbs or the new one based on 270 lbs? The Concept2 site says, "By using 270, the weight adjusted score becomes a pretty good estimate of a person’s potential speed in an eight."

Totally agree that using erg scores as a predictor of water scores is a very imperfect science. But it's provides a decent baseline, and I just want to be consistent.

Many thanks!

h.