Originally Posted by
DannoXYZ
The wind-up and angle is CAUSED by the torque from the hub, it doesn't GENERATE the torque or the increase in tension. ..What happens is ALL hubs will wind-up until the increase in tension equals the applied torque. .. It's the torque that causes the wind-up and tension-increase. But that tension-increase is the same in all cases and comes from the force applied at the pedals.
+1
Originally Posted by
DannoXYZ
Here's a good start:
1. 250 lbs = 114kg = maximum total-force on pedals for Olympic level track-racer (use 1/2 that for most arm-chair racers here)
2. 170mm = 0.170m = crank-length
3. 114kg * 0.170m = 19.38kgm torque at bottom-bracket
4. 0.288 ratio = 52x15t = gearing used for 100% all-out sprint
5. 0.288 * 19.38kgm = 5.58kgm = torque at rear-hub
6. 38mm = 0.038m= diameter of rear-hub
7. 5.58kgm / 0.038m = 147kg = total pulling force on spokes at hub
Note that this force on the spokes at the hub is the same regardless of the lacing.
+1 again
Originally Posted by
DannoXYZ
..let's look at how this total force is distributed amongst the spokes:
32-HOLE 4x/3x/2x
32h /2 = 16 = number of pulling spokes
147kg/16 = 9.19kg = extra tension added to each pulling spoke
120kgf = initial tension
9.19/120 = 7.7% = increase in tension on each pulling spoke from Olympic-class sprinter at maximum-exertion
32-HOLE 0x RADIAL
32h /1 = 32 = number of pulling spokes
147kg/32 = 4.59kg = extra tension added to each pulling spoke
120kgf = initial tension
4.59/120 = 3.83% = increase in tension on each pulling spoke from Olympic-class sprinter at maximum-exertion.
Now that's some interesting numbers! Thanks for cranking them out.