For those of you who like to troll fast spoons are not a good choice. As Snow Dog says test the action of any spoon you use at the side of the canoe rather than guess at the correct speed. Most spoons' action break down at surprisingly slow speed. If you want to troll fast Rapala Tail Dancers are the best lure I know of for high speed. According to Rapala they will not break down at any speed you can paddle.
Trolling fast is an effective method for triggering strikes but it must be done with the correct type of lures and high quality terminal tackle.