For those who have tried the 4 blades on their pattern plane, what is the consenous on them? how do they compare to the larger 2 blades, ie 17x12. Looking for a prop for a mintor 170 on an OTOP pattern plane for good pulling, and more manageable speed both level, up and down. Also, what about the mejzliks, was looking at the 19x8 to be used on the same motor.