This article is from the Sea Kayaking FAQ, by Todd Leigh with numerous contributions by others.
No. Some groups used the two bladed paddle exclusively and some groups
used the one bladed paddle exclusively. It many times depended on the
boats design. Some groups that used two bladed paddles also kept one
or two one bladed paddles with them to use for stealthier paddling
when hunting or for use as a spare.
There were groups that used the single bladed paddle to roll.
 
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