The suggested prop for the Kingtech 60TP is a 24x20, or a 24x22 three-blade prop. If I remember correctly, the suggested prop for the SPT 5 is 24x12, or 24x14 three-blade. Started my K-60 TP for the first time this past weekend using a 24x17 three-blade SEP prop. Only ran the engine for a short period, but never above
1/2 throttle. I was impressed by the power of this little jewel. (Manual states power is 7.3 kw at 7000 rpm)