On returning to Bell's large laboratory at his Beinn Bhreagh estate near Baddeck, Nova Scotia, they experimented with a number of designs, culminating in Bell's "HD-4". Using Renault engines, a top speed of was achieved, accelerating rapidly, taking waves without difficulty, steering well and showing good stability. Bell's report to the United States Navy permitted him to obtain two 260 kW (350 hp) engines. On 9 September 1919 the "HD-4" set a world marine speed record of , which stood for two decades. A full-scale replica of the "HD-4" is viewable at the Alexander Graham Bell National Historic Site museum in Baddeck, Nova Scotia.