On 13/08/2014 13:09, Tim Streater wrote:
Which will still leave you with residual ripple.

Ripple on tides? Whatever next

More seriously though - one tidal system has a power output ranging from
0% (at high or low tide; slack water) to 100% (mid tide, peak flow)

Two out of phase add up nicely - I think if they are true sines you'll
get 70% of peak at worst.

Andy