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  #271  
Old Yesterday, 03:46 PM
kramnnim kramnnim is offline
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And so we agree on the 7oclock.

You also said this:

Quote:
The frame doesn't flex down at 6 o'clock. That's not part of what happens during pedaling and has no place in the discussion.
My Pioneer shows very clearly that this is not true. (whenpesalingoutofsaddleatlowrpmwhilerockingthebik ebackandforth)

Last edited by kramnnim; Yesterday at 04:07 PM.
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  #272  
Old Yesterday, 03:47 PM
cachagua cachagua is offline
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Quote:
Originally Posted by Kontact View Post
You never propose what you do think...

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Originally Posted by cachagua View Post
Strain energy in the frame cannot "spring back" as acceleration.
That's from post #16. I've continued to develop that idea as we've gone along, and if you want I can recap some of what I've posted.
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  #273  
Old Yesterday, 05:13 PM
Kontact Kontact is online now
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Quote:
Originally Posted by cachagua View Post
That's from post #16. I've continued to develop that idea as we've gone along, and if you want I can recap some of what I've posted.
I'm sorry to have to explain this, but saying what doesn't happen is not the same as saying what does.


You have NEVER explained where you think this energy is going and by what mechanism.
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  #274  
Old Yesterday, 05:14 PM
Kontact Kontact is online now
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Quote:
Originally Posted by kramnnim View Post
I think a flexy frame wastes energy under certain pedaling styles.
By what mechanism? Where does it go and how is it isolated from the driveline that created it?
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  #275  
Old Yesterday, 07:38 PM
kramnnim kramnnim is offline
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Originally Posted by Kontact View Post
By what mechanism? Where does it go and how is it isolated from the driveline that created it?
Downward pressure from the rider flexes the frame rather than providing radial force to the crank arm to make the crank rotate. Frame flexes back when the now tangential force from the rider lessens and does not provide any rotation to the crank arm.
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  #276  
Old Yesterday, 08:06 PM
Kontact Kontact is online now
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Originally Posted by kramnnim View Post
Downward pressure from the rider flexes the frame rather than providing radial force to the crank arm to make the crank rotate. Frame flexes back when the now tangential force from the rider lessens and does not provide any rotation to the crank arm.
If the frame flexes back after 6 o'clock, that means the pedal is being raised. If the pedal is being raised while it is already traveling upward, how is that not helping the rider pedal?
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  #277  
Old Yesterday, 08:20 PM
kramnnim kramnnim is offline
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Originally Posted by Kontact View Post
If the frame flexes back after 6 o'clock, that means the pedal is being raised. If the pedal is being raised while it is already traveling upward, how is that not helping the rider pedal?
The upward and lateral movement of the BB (including the entire crankset as well as the pedal) does not result in crank rotation.
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  #278  
Old Today, 02:07 AM
Kontact Kontact is online now
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Originally Posted by kramnnim View Post
The upward and lateral movement of the BB (including the entire crankset as well as the pedal) does not result in crank rotation.
The pedal is on the end of the crank and it is rotating upwards between 6 and 12 o'clock. So if the end of the pedal is lifting as it swings up from the BB, and your foot is at 7 o'clock when that happens, it is most certainly helping move your foot in the direction of pedaling.
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