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Message: <blockquote data-quote="FuzzyGrub" data-source="post: 225409" data-attributes="member: 3438">I'd raise the motor and retest with 3 blade, before buying another prop.What are the hole spacing on the mini jacker?  I thought they were 1" spacing.  If so, select mounting holes that will give plus minus one inch.   So if you go with starting point of 2", you also have 1" and 3".  As mentioned above, you can usually block a motor with 1/2", so you would also have 1 1/2", 2 1/2", and 3 1/2".    Starting at 1 1/2", gives 1/2" flexibility from 1/2" to 3".  Look forward to seeing your results.</blockquote>