4 blades propeller on OS46LA

I just imagined to set two pieces of 9-5 propeller on OS 46LA for braking effect in downing phaze like Golf ball and Hour glass. I wanna see what will happen the phenomena if the props were set in different tracking position. By increased blades in number to double load, 9-5 prop must be suitable or over load, so I guess, the fact would be proved actually tomorrow after noon. This is the indispensable experimental trial for the future application in F3A field with gas motor, now the people has tendency to change the power from gas to electric motor. If 4 blades propeller would be suitable and had a enough braking effect, I would like to choose this method.