Thunderhawk 1400 ID Plate - On the ID plate for this 1970 boat Thunderhawk's address is shown to be Dawson, Georgia. ID plates from earlier boats say Rebecca, Georgia. The ID plate says maximum horsepower is 65. The brochure says minimum horsepower is 10 but that is not going to satisfy you. At first I had a 20 horspower motor on the boat. It would plane fairly quickly with one person on board but was slow to plane with two people on board in the front seats. 35 horsepower is probably about the minimum size motor you would want to put on this boat. 55 horsepower is about the most you would want.