Good to know. Thanks.The incline can be pretty steep. I've posted a photo of the hill I used to test. But yes, you'd need to fly pretty slow (I'd say around 5mph) and it's not often that this type of flying should come into play. But you may find yourself accidentally flying too low and the ultrasonics could save the day.
I'd say for every foot in, this hill rises a foot. That is pretty steep.
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