On 10/28/2011 3:28 PM, Pete Keillor wrote:

The jon boat's good points are it's cheap and will take a beating. Bad
points are it's not an efficient hull for displacement speeds, and
aluminum doesn't absorb vibration.

Pete Keillor


Add to that (downsides) having a prop and rudder under the boat would
mean the boat can't be beached without certain damage.