Just got an EMAIL from Jamestown Distributors describing their new
line of trolling motors. The "2.0" model is claimed to have 121 lbs
of static thrust which is comparable to a gas outboard in the 4 to 6
hp range. There is also a "4.0" with 215 lbs of thrust, equivalent
to something like 8 to 10 hp. Unfortunately they are not cheap as
you might imagine:

http://www.jamestowndistributors.com/userportal/show_product.do?pid=51070

http://www.jamestowndistributors.com/userportal/show_product.do?pid=52926