Free images results:
 

Sloop pictures, stock photos and images

 
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Ship Royalty Free Stock Images
Author: Allein
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Sloop Royalty Free Stock Photo
Author: Blakeley
Sloop Stock Photography
Author: Blakeley
Sloop Royalty Free Stock Images
Author: Lledospain