A two bladed prop is more efficient than a 4 bladed one. Don't ask me how I know though because it was demonstrated to my R/C flying club one year. If you could make a 1 bladed prop that would be the most efficient.
Please, please, please do not exceed the max. rpm rating for the prop. I've seen blades break and imbed themselves into wooden benches 10 feet away.
These props are not toys and should be treated as you would a circular saw.
I know you will use proper guarding around the prop. If a prop gets knicked THROW IT AWAY!!!
Other than that it looks like it would do the job of moving your bot around. I think the only problem you will see is a slow take off (no pun intended
)from a dead stop.
BTW I have been flying model airplanes for 30+ years.
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