Paddle length for Coosa Kayak

[twedinger]

Purchased a used Coosa (my first kayak) -- it is 11' 4" -- 31.5" wide.

Personal Data 6' 2" sleeve length 35"

It did not come with a paddle.

The more I read the more confused I get.

With the seat in the lower postion I can get by using my wife's spare Hobie paddle -- 230cm

With the seat in the raised position I have to use the paddle more like a canoe oar.

Was going to buy a 240cm -- but that is a little over 4" more in length.

If anyone out there has some experience in this I would greatly appreciate the advise.

Thank you