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I wouldn't put a huge prop with low KV on a rigger, I prefer small props and higher KV for riggers. Fluid gave you a setup that will work well, as he implied riggers and hydros in general are sensitive to prop walk, this is because the prop is so far from the CoG and the running surfaces that the leverage it has on the hull is huge compared to the leverage the prop has on a mono or cat, and props that work fine on monos and cats can result in very poor handling on a rigger of a similar size and weight. A rigger also has less drag when on plane and therefore needs less thrust, allowing you to get the same acceleration from a smaller prop and gain speed by spinning it faster.
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