Drive loss due to roller chain

Can anyone tell what what the drive efficiency loss is through roller chain. For instance if I have four parallel shafts connected by individual roller chains, assuming all of the sprockets are the same size, what is the power loss between shafts due to the roller chain?

 

[Philrock]

Mark's Handbook for Mechanical Engineers says 98-99%, but I think this is over-optimistic. Under ideal conditions:

Chain and sprockets not significantly worn
Running within manufacturer's ratings
Good alignment
Good lubrication
Sufficient number of teeth in small sprocket:
17 or more for low speed drives
21 or more for moderate speed drives
25 or more for high speed drives

- I'd suggest using 95% per drive.

Four shafts means three drives: .95 x .95 x .95 = 85.7% efficiency.

pdr@baymachinedesign.com