As a "Plan B" in case the proposed Inspiration Mars fly-by of Mars missed its 2018 launch window, in November 2013 Dennis Tito proposed a different mission architecture whereby the mission craft would first fly-by Venus, using Venus in a gravitational slingshot to speed the craft's onward journey to Mars.
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The proposed mission would use a Saturn V to send three men to fly past Venus in a flight which would last approximately one year.
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