Re: Drop Axle Guni project shelved


Moves power through a pair of sprockets and chain at a friction loss of
x. The power loss alternates from pedal to pedal, as each takes it's
turn as the driven set. So power loss in the drive train would be x,
plus the friction of the sprocket set on the other side that is
coasting, y. x will be much greater then y, as it is a percentage of
the power needed to drive the whole vehicle, y is a percentage of the
power needed to rotate the pedal and unloaded chainset, a much smaller
value.
With the jackshaft design, the power on each stroke goes up to the
shaft with a power loss of x, and back down to the wheel through a
second driven set, at another loss of x. The coasting side pedal does
the same. So the friction loss of the jackshaft design will be 2x plus
2y.
We can ignore the minor friction loss of the jackshaft bearings, as
it should be the same as the loss from the pedal stub shaft bearings in
the other design.
With motorcycle roller chain, x would equal at least 6 % of the drive
power. Bike chains I don't know. Probably more like 2-3 %.
As far as what is the fastest design ?, that may come down to what
pedal placement is better for the rider. If having the pedal axis
below the wheel axle is OK, then that design has a slight power edge.
If it impairs the ride ability at all, that may suck.
Wouldn't it be great if the lower pedal setup improved stability !
Best case scenario , improved rider power and reduced drive line loss
.

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