Re: whale tails?
Instead of a whale tail, have you checked to see if your motor is raised high enough on the transom?? Your cavitation plate should be about 1 inch higher than the bottom of your boat. Additionally, are you propped correctly?? Is the weight evenly distributed in the boat??
What are you trying to accomplish with a WT??
Whale tales are nothing more than a poor bandaide for an underlying problem.....some less expensive solutions are mentioned above.