I think you missed my point.
I was not interested in a sail per se, but a huge radiotelescopic dish, that is propelled by the solar wind.
When I meant away form gravitational effects of our planets I meant flying not so close to them that it would get get attacted to an orbit and eventually crash on the planet.
I am fully aware that there are always gravitational effects on our solar system but these should not have a negative effect on the sail's perfomance if the sail stay away far enough.
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