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Accelerating a pedal-powered bike by 135kph / 83mph is a stunning accomplishment. I am flabbergasted that you don't see that as something notable.

proxygeek 8y ago
And maintaing the balance at those speeds. I can hardly control mine at 50 kmph downhill
- DoofusOfDeath 8y ago
  > And maintaing the balance at those speeds. I can hardly control mine at 50 kmph downhill Wouldn't balance actually be easier, due to the gyroscopic effect of how fast the wheels would be turning?
  - adam-a 8y ago
    The gyroscopic effect is not what causes a bike to balance, it's the arrangement of centres of mass around the pivot or steering. It is harder to maintain that balance at high speeds since small adjustments to the steering produce much quicker responses. https://ezramagazine.cornell.edu/SUMMER11/ResearchSpotlight.html https://ezramagazine.cornell.edu/SUMMER11/ResearchSpotlight....
    - blauditore 8y ago
      That's highly inaccurate. The gyroscopic effect is not everything, but it does get stronger at higher speeds. That's why even a simple wheel without any frame or steering mechanism will run mostly stable at high speeds. So when going at high speeds on a bike, it indeed is more stable than when going slow. The article you link only claims that the gyroscopic effect is not everything stabilizing a bike.
- usrusr 8y ago
  That's a problem with your posture and/or your bike's geometry (or just a loose headset), not an inherent problem of going 50 kmph
DoofusOfDeath 8y ago
> Accelerating a pedal-powered bike by 135kph / 83mph is a stunning accomplishment. I am flabbergasted that you don't see that as something notable. I just don't know either way. I would imagine it comes down to how much time or distance she had to accomplish that acceleration. Because without significant wind resistance, and with appropriate gearing ratios on the bike, honestly I just don't know what else would be physically demanding.
- tomglynch 8y ago
  She's a world champion athlete. You're seriously underestimating her physical prowess.
- rainforest 8y ago
  > As Holbrook accelerates, the cyclist will push 700 watts for more than a minute to stay inside the draft pocket behind the dragster’s fairing. That’s about what a Tour de France sprinter produces in the final minute of a stage. From https://www.wired.com/story/denise-mueller-korenek-bike-speed-record-168-mph https://www.wired.com/story/denise-mueller-korenek-bike-spee... - 700W over a minute is very physically demanding.

proxygeek 8y ago

And maintaing the balance at those speeds. I can hardly control mine at 50 kmph downhill

DoofusOfDeath 8y ago
> And maintaing the balance at those speeds. I can hardly control mine at 50 kmph downhill Wouldn't balance actually be easier, due to the gyroscopic effect of how fast the wheels would be turning?
- adam-a 8y ago
  The gyroscopic effect is not what causes a bike to balance, it's the arrangement of centres of mass around the pivot or steering. It is harder to maintain that balance at high speeds since small adjustments to the steering produce much quicker responses. https://ezramagazine.cornell.edu/SUMMER11/ResearchSpotlight.html https://ezramagazine.cornell.edu/SUMMER11/ResearchSpotlight....
  - blauditore 8y ago
    That's highly inaccurate. The gyroscopic effect is not everything, but it does get stronger at higher speeds. That's why even a simple wheel without any frame or steering mechanism will run mostly stable at high speeds. So when going at high speeds on a bike, it indeed is more stable than when going slow. The article you link only claims that the gyroscopic effect is not everything stabilizing a bike.
usrusr 8y ago
That's a problem with your posture and/or your bike's geometry (or just a loose headset), not an inherent problem of going 50 kmph

DoofusOfDeath 8y ago

> Accelerating a pedal-powered bike by 135kph / 83mph is a stunning accomplishment. I am flabbergasted that you don't see that as something notable. I just don't know either way. I would imagine it comes down to how much time or distance she had to accomplish that acceleration. Because without significant wind resistance, and with appropriate gearing ratios on the bike, honestly I just don't know what else would be physically demanding.

tomglynch 8y ago
She's a world champion athlete. You're seriously underestimating her physical prowess.
rainforest 8y ago
> As Holbrook accelerates, the cyclist will push 700 watts for more than a minute to stay inside the draft pocket behind the dragster’s fairing. That’s about what a Tour de France sprinter produces in the final minute of a stage. From https://www.wired.com/story/denise-mueller-korenek-bike-speed-record-168-mph https://www.wired.com/story/denise-mueller-korenek-bike-spee... - 700W over a minute is very physically demanding.