Rowing is already long sychroon. All rowers in the boat set off at once, and so on operate them. However, this creates a great variation in speed, which sometimes much energy can be lost, therefore it is very doubtful whether this would be the most efficient way of rowing. When asynchronous rowing swings that are much smaller and this method is also faster. Annette Brewer doing his graduate research on this subject at the Faculty of Human Movement Sciences at VU University in Amsterdam. Most of the information described here comes from a presentation on their project. This is not my information but also has no written source. However, it is interesting enough to share with all of you.
Rowers get ahead by increasing, where they shoot, so to speak uprising against the water end e boat backwards. Then pull back, allowing the boat beweegd forward. The mass of the boat is less than that of the rower, the boat so hereby beweegd relatively over the rowers. The boat accelerates when rowers withdraw and brakes as drop rowers.
The resistance of the boat with water, you can count on the following formula:
F = 1/2 * P * A * C V²
Where F is the force of the resistance, p is the density of the substance, if going through beweegd, v is velocity, a is the surface area of the boat, in the travel direction, and C is a resistance coefficient.
You can see that the resistance is dependent on the speed squared. This means that if the speed is doubled, the resistance four times as great! A fluctuation in the rate, logically, has an increased resistance as a result.
A calculation of Beeltje can make it clearer. Water resistance never changes the surface of the boat, too, and not just drag coefficient either. Because they are always the same, we can also call these x. The resistance force is thus: F = x * V²
Assume a rate fluctuation goes half the time 5 km per hour and the other half 10 mph. The resistance can then be calculated by: F = 1/2 * 5² + 1/2 * x = 62.5 x 10
With a constant velocity exactly between you receive this calculation: F = 56.25 7,5² * x = x
conclusion: at a fluctuating rate in this example, you have a power of 62.5 times against a set of constant values that we call x. at an average speed you have an opposite effect 56.25 times the same set of constant waarden.Oftewel : at a constant speed you encounter less resistance.
Asynchronous rowing for a constant speed.
Then comes the question now, you can not simultaneously by rowing ensure that the boat a constant speed? In these charts, you can see how you can join boat speed. In the first graph, one can see fluctuations, but in the second graph quench peaks formed by a group of follower through Dalarna of the other group and vice versa. In this way a constant speed. Well, the practice is not so beautiful, in fact, withdrawal phase, and sales network is not quite the same length, so the overlap is not perfect. So the fluctuation does not disappear completely, but is much smaller.
Measurement at ergometers
Anouk de Brouwer has stopped the anti phase rowing made major measurable. She uses ergometers, these are rowing machines even in the gym to work on the side. She has made two together and put on wheels. Ergometers can now move like a rowboat over the rowers. Now she let rowers rowing on ergometers in-phase and anti-phase, and it was indeed found that the rowers in anti-phase remained almost stand still, where she Phase Rowing increasingly upset over half a meter!
But what does it mean in practice? Anti Phase rowing is a disadvantage, because the movements are not going right, you can sit together in the way. For this type of boat do you need a bigger boat! Moreover, it is not appropriate to do this from the beginning. Acceleration will be better synchronized, so the start will probably have to be synchronized rowing. Then, a transition, and may asynchronously better. For now it is still not found any evidence rowing asynchronously. But strong indications. Without a doubt this story is still so later prosecuted.
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