Mini quadcopter proximity - why no broken propellers?

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Thought I'd take the SurveilZone 5040 "unbreakable" propellers for another spin on my MXP230 in a new part of the park here just outside of Tokoroa and see if they'd survive. Yes they did -- not even a nick on them! I did notice that my speed was way-down though, when compared to the GemFan 5040 props.
Note that I have already reviewed these props on my RCModelReviews channel.
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