for fishing, so you can cast, etc., without manning the paddle for a potential brace.
Does anyone manufacture such and item?
sponsons
yes, there are a number of commercially made models.
you can even make your own outta 2 paddle floats.
steve
here…
build your own…
mine:
http://community.webshots.com/album/549155742WqMgFt
From here:
http://www.kayakfishingstuff.com/ri_articles.asp
TWO articles in the Rigging column on the right…I took a little from each type and built my own.
flatpick-can you name a few companies
that make these? thanks.
ok…
we do. 
http://www.voyageur-gear.com/2002_product.php?category=Safety&page=2&filter=B
do a google ‘kayak sponson’ you’ll get ol’ Timmy Ingrahams (sponsonguy.com I think)
not sure but I think there’s a Aussy company as well.
steve