Gemfan brings you the new 40mm 4 Bladed prop, this brings high efficiency and with power at your fingertips, this is a great prop for your Mobula 6/7 or Mobula HD or any 75mm Brushless build.
Below is a motor test showing current and thrust lines, the graff below for the purple(3 Bladed Gemfan 40mm) and blue(4 Bladed Gemfan) on Boost Juice.
You will see the current draw is low and thrust is very close to the rest of the props.