Koen Pelgrim

Coach at Soudal-Quickstep

[Transfer Solutions @Transfer_ICT]

Proud to announce the successful collaboration between Transfer Solutions and Soudal Quick-Step! Today, we welcomed @koenpelgrim1 and @AleTegner in Leerdam. As a tech partner, we're delighted to contribute to the strategic decision-making process based on data #TechPartner #data

[Koen Pelgrim @koenpelgrim1]

@realBertBlocken @jonas_creteur @KU_Leuven @ANSYS It's difficult to understand why there are rules in place for cars following in a TT to prevent a 0.2% drag reduction, but nothing is being done to prevent a >20% advantage from riding 10m behind a motorbike. Which happens 90% of the time in any road race.

[Koen Pelgrim @koenpelgrim1]

@Lowe_Profile_ @PatLefevere And which ‘language’ do press officers from Manchester speak?

[Koen Pelgrim @koenpelgrim1]

@Lowe_Profile_ Your phone does slowmotion video’s?

[Koen Pelgrim @koenpelgrim1]

@Lowe_Profile_ @andypowers @TourDeJose You call this driving?

[Koen Pelgrim @koenpelgrim1]

@Lowe_Profile_ Are you holding your imaginary dance partner?

[Koen Pelgrim @koenpelgrim1]

@kwiato @golasmichal Now I finally understand why he left us.

[Koen Pelgrim @koenpelgrim1]

@Lowe_Profile_ Was that the ultimate goal of Project 40?

[Koen Pelgrim @koenpelgrim1]

@Lowe_Profile_

[Koen Pelgrim @koenpelgrim1]

All good things come to an end, but sad to see an excellent rider and an even better person leaving the peloton. It was a true pleasure coaching you during parts of your career Serge and I'm sure there are still great things ahead of you off the bike.

[Serge Pauwels @sergepauwels]

For 15 years I’ve been lucky to chase my dreams in cycling at the highest level. Now it’s time to end this cycle, to look back on great memories, and to realize that the journey itself was the dream.
Thank you to my family, friends, fans, teammates and team staff for the support!

[Koen Pelgrim @koenpelgrim1]

@BKesteren @thijszonneveld @Sportarts @op1npo Mijn waarde voor luchtdichtheid was iets te hoog (1.20 ipv 1.185), waardoor de luchtweerstand lager zou zijn. Crr zal waarschijnlijk lager kunnen zijn (beste waardes liggen tegen de 0.002). Er zijn aannames die kunnen zorgen voor een hoger or lager getal dan in de realiteit.

[Koen Pelgrim @koenpelgrim1]

@BKesteren @thijszonneveld @Sportarts @op1npo Dat is zeker niet te laag. Windtunnel data laten bij onze renners waardes tussen de 0.23 en 0.29 zien, afhankelijk van postuur, houding.. Fietsen, kledij, helm zijn tegenwoordig niet meer een fladderend jasje op een fiets met ronde buizen en uitstekende kabels.

[Koen Pelgrim @koenpelgrim1]

@BKesteren @thijszonneveld @Sportarts @op1npo Dat klopt Ben, ik bedacht mij later dat ik die was vergeten. Tegenwoordig bedraagt die echter geen 3%, maar eerder 1,5-2%. Zie hieronder bijvoorbeeld data (niet dat futuristisch ding, maar de geoptimaliseerde traditionele)(https://t.co/SxDuybphnP)

[Koen Pelgrim @koenpelgrim1]

@thijszonneveld @Sportarts @op1npo Niet zonder toestemming van de renner zelf, maar op basis van bovenstaande kom ik op een verschil van 4 W tussen de berekening en de meting.

[Koen Pelgrim @koenpelgrim1]

@thijszonneveld @Sportarts @op1npo 1: (CdA * p * v3) / 2 = (6.01 m/s 3 * 1.2 * 0.27) / 2 = 35.2 W
2: Crr * m * g * v = 0.004 * 72.8 * 9.81 * 6.01 = 17.2 W
3: (m * g * h) / t = (72.8 * 9.81 * 501) / 970 = 368.1 W
35.2 + 17.2 + 368.1 = 420.5 W
420.5 / 65 = 6.47 W/kg

[Koen Pelgrim @koenpelgrim1]

@thijszonneveld @Sportarts @op1npo Vermogen is (1) luchtweerstand + (2) rolweerstand + (3) overwinnen zwaartekracht. Uitgaande van Crr van 0.004, CdA van 0.27, 65 kg renner, 6.8 kg fiets en 1 kg extra (helm, schoenen, kledij).

[Koen Pelgrim @koenpelgrim1]

@TPV01 @ammattipyoraily Environmental temperature can have that effect, but that would be due to overheating of the body. This can be the case in a long effort, especially when speeds are low (like on a climb) and air cooling and vaporization is limited, but not in a short TT at 56 kph.

[Koen Pelgrim @koenpelgrim1]

@TPV01 @ammattipyoraily And the same accounts for the effect of temperature, as inspired air is goes up to 37 degrees Celsius once it reaches the alveoli.

[Koen Pelgrim @koenpelgrim1]

@TPV01 @ammattipyoraily Air we breathe is heated and humidified by our upper airway. By the time the air reaches the alveoli, it is 100% saturated with humidity, even when we breathe very dry air. So breathing dry air versus humid air has no effect on the partial pressure of oxygen reaching our lungs.