General discussion on Training. How to get better on your erg, how to use your erg to get better at another sport, or anything else about improving your abilities.
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Nomath
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by Nomath » February 5th, 2022, 5:39 pm
jamesg wrote: ↑February 5th, 2022, 1:58 am
The work put into the handle reduces our kinetic energy and increases that of the flywheel; this looks like a free switch, but it cannot be done without our contracting muscle, so cannot be equated to an elastic exchange with energy recovery.
The force needed to reduce the kinetic energy is a pull on the handle. It's a pull in the same direction as for speeding the flywheel. It requires nothing special. It blends almost naturally in the rowing movement. Newbies are advised to row strapless as a drill to learn that their body movement has stopped before the legs are fully stretched. It quickly becomes an automatism.
I am glad that you admit that the kinetic energy in the drive phase is used to drive the flywheel and is counted by the ergometer.
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jamesg
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by jamesg » February 6th, 2022, 2:28 am
Please explain how "kinetic energy in the drive phase is used to drive the flywheel and is counted by the ergometer".
08-1940, 179cm, 83kg.
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Nomath
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by Nomath » February 7th, 2022, 10:53 am
I think I have explained this several times already.
Newton's laws state that a mass in motion is not stopped until you apply a force that counteracts that motion. There are two ways to reduce the speed of the body mass during the drive. A pull on the foot straps at the end of the drive will kill the kinetic energy without return. In contrast, a pull on the handle halfway the drive will count as work by the C2 measuring system, provided that the handle speed matches the flywheel speed. This is evidently the case during the drive, otherwise the handle would offer zero resistance. Power = force x handle speed.
Observations and measurements show that able rowers do not pull on the foot straps during the drive.
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JaapvanE
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by JaapvanE » February 7th, 2022, 3:29 pm
Nomath wrote: ↑February 7th, 2022, 10:53 am
A pull on the foot straps at the end of the drive will kill the kinetic energy without return. In contrast, a pull on the handle halfway the drive will count as work by the C2 measuring system, provided that the handle speed matches the flywheel speed. This is evidently the case during the drive, otherwise the handle would offer zero resistance.
Hence my thought experiment about strapless rowing....