Spencer Yachts is as famous for building fast boats as it is for pushing the envelope in design and propulsion innovation. Both Chasin and Stream Weaver qualify as rocket ships, with top-end speeds well in excess of 40 knots. But with all of the additional appointments on Chasin, the boat weighs considerably more than Stream Weaver, yet with the added weight and a full tower, it gives up only about 2 knots on top-end.