▁name = de ▁Hav ill and ▁H yd rom atic ▁| prop ▁dia ▁ft = 1 3 ▁| prop ▁dia ▁note = constant - speed ▁fully - fe ather ing ▁prop ellers ▁ ▁| max ▁speed ▁m ph = 3 1 5 ▁| max ▁speed ▁note = at ▁ ▁and ▁▁ ▁at ▁sea ▁level ▁ ▁at ▁ ▁| c ru ise ▁speed ▁m ph = 2 9 0 ▁| c ru ise ▁speed ▁note = maxim um ▁weak ▁mixture ▁at ▁▁ ▁at ▁▁ ▁at ▁sea ▁level ▁| st all ▁speed ▁m ph = ▁| st all ▁speed ▁note = ▁| ne ver ▁exceed ▁speed ▁m ph = ▁| ne ver ▁exceed ▁speed ▁note = ▁| min imum ▁control ▁speed ▁m ph = ▁| min imum ▁control ▁speed ▁note = ▁| range ▁miles = 4 1 0 0 ▁| range ▁note = at ▁ ▁and ▁ ▁with ▁ ▁payload ▁ ▁at ▁ ▁and ▁ ▁with ▁ ▁payload ▁ ▁at ▁ ▁and ▁ ▁with ▁ ▁payload ▁( maxim um ▁weak ▁mixture ) ▁ ▁at ▁ ▁and ▁ ▁with ▁ ▁payload ▁( maxim um ▁weak ▁mixture ) ▁| fer ry ▁range ▁miles = ▁| fer ry ▁range ▁note = ▁| end urance = ▁| ce iling ▁ft = 2 4 3 0 0 ▁| ce iling ▁note = ▁ ▁on ▁three ▁engines ▁Ab solute ▁ce iling : ▁ ▁at ▁maximum ▁continuous ▁power ▁ ▁on ▁three ▁engines ▁| cl imb ▁rate ▁ft min = 9 7 0 ▁| cl imb ▁rate ▁note = at ▁ ▁and ▁▁