# Computing train value of planetary gear

1. Dec 10, 2012

### lucfuture

2. Relevant equations
e=(product of number of driving teeth)/(product of number of driven teeth)

e=(n$_{out}$-n$_{arm}$)/(n$_{in}$-n$_{arm}$)

3. The attempt at a solution
e=(N$_{p1}$/N$_{s1}$)*(N$_{s2}$/N$_{p2}$)
e=1.25926

e should be 0.7941 however

From there out it seems pretty trivial. I just need to get the right e value.

2. Dec 10, 2012

### lucfuture

Problem statement

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