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HDF evaluation on the water and rowing machines Mass-Equivalent is equal to a mass, which a rower would accelerate horizontally in ideal conditions without gravity and friction, having the same overall feeling of “heaviness” as in the given rowing conditions. the Mass-Equivalent is not the same as the force applied by a rower. With constant ME, a rower may pull harder or lighter: higher force increases the handle acceleration and velocity, so drive time would be shorter, and vice versa. After the catch and during the first 20% of the drive length, in-boat rowing feels twice as “heavy” than on a rowing machine. Rowing on stationary Concept 2 should feel slightly lighter than a 1x and heavier than a 2x, and the mobile RP3 is similar to 2- or 4x. 23/05/2020 View
HDF indicator in more detail The physical interpretation of HDF is: it equates to twice the mass-equivalent m divided by a distance s, which it would travel, if there was a constant force applied to this mass in ideal conditions without gravity and friction. The drive feels heavier at low rates and lighter at high rates, because recovery time gets significantly shorter and the system velocity decreases less at the start of the drive. The average force is inversely proportional to the square of the drive time, which means to shorten the drive time twice, four time higher force required, and vice versa. 07/05/2020 View
Effect of stretcher height on rowing technique A new stretcher force sensor has been developed recently in BioRow, which consists of four load cells measuring only the horizontal force component at the toes-heels/ left-right foot. The sensor has been tested on the RP3 rowing machine in a brief experiment with two different stretcher heights. The results of the study indicate that lower stretcher position could be beneficial for rowing power and technique. The obtained data has proved usability and accuracy of the new BioRow stretcher force sensor. 31/03/2020 View
HDF during the drive The peak HDF happens straights after the legs velocity peak, when trunk and arms start working (8) and the boat acceleration has its first peak. This moment could be felt by a rower as “the blade locks on” . The pattern of HDF is quite consistent across various stroke rates and rowing styles. A softer oar makes HDF and rower’s feelings of pressure more evenly distributed during the drive. 17/03/2020 View
Handle Drag Factor Handle Drag Factor HDF was introduced as a measure of rowing “heaviness”- a “burden factor” of sorts. Bigger rowers produce higher power and also have higher drag, so higher HDF. Every 1 deg longer catch angle and 1 cm longer outboard increased HDF by about 1.5 units. Front-loaded drive feels faster and lighter; subsequently more power towards the finish makes the drive heavier. Many coaches are still looking for some “magic” rigging numbers and believe that tiny changes in oar length make a significant difference. However, results of this study show that catch angles and power application make similar or even more significant effects on stroke mechanics, rower’s feelings, drive time and stroke rate. 11/02/2020 View
Review on blade propulsive efficiency Blade efficiency is very popular topic in rowing community discussions, and opinions are still quite controversial. Some factors have an opposite effect on the blade and rower’s efficiencies, and attempts to increase the former may decrease the latter and therefore decrease overall rowing efficiency. the blade propulsive efficiency and drag factor could be used for evaluation of the equipment quality and rower’s oar handling skills, but for the best rowing performance, other components of the system must be taken into account to find an optimal balance. 24/12/2019 View
Experimental evaluation of four types of 2x hulls In November, a biomechanical comparison was conducted to determine the hull efficiency of several different boats. The method came in the form of two-boat side-by-side trials, which eliminated the effect of weather conditions, based on the assumption that the wind speed and direction were the same for both boats. It was found that the new WinTech hull gives about 1% (3.7s over 2k) advantage over the old WinTech hull, 0.11% (0.4s) advantage over Empacher, and about 2,5% (9.3s) advantage over Filippi hull. 09/12/2019 View
Trends and prognostic rowing speeds Random nature of the weather and lack of information about wind during World regattas make trends of rowing speed quite difficult to analyse. It is possible to say that within a small degree of probability, average rowing speed grows about 0.06% per year, which means the average race is about 2s faster every 10 years. The fastest growth was found in W8+ 0.43s per year and the slowest - in W4x 0.02s per year. 18/11/2019 View
Stretcher force and seat movement The seat movement can be used as an adequate indication of the stretcher force during the recovery. It indicates synchronisation of rowers’ interactions through the stretcher before and at the catch, which is important for effective crew dynamics. Better synchronisation of the seat movement before and at the catch is related to the optimal pattern of boat acceleration and more effective dynamics of the crew during the drive. 15/10/2019 View
Analysis of results of Worlds-2019 in Linz The weather in Linz made the general growth of the speed lower (0.29% per year) than after the previous year’s fast Worlds in Plovdiv. It looks like the rapid increase of racing stroke rates from 2017-18 has gone down. More than half of the winners in Olympic events (8 out of 14) won with a lower stroke rate than their competitors, which means they got an advantage because of higher effective Work per Stroke. 17/09/2019 View
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