Where is anyone “encouraging” BVLOS?
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Just make sure that your RTH altitude is set higher than the rock so if/when you do lose signal it will fly back over the top, not try and drill a hole through it 
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Another advantage, there, from flying from the top of the higher cliff. RTH is set from take-off altitude. 
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Are you reading the same thread I am Jeff @RonnieBarker 
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The King really has no say believe it or not.
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Unless you lose signal while you’re under the arch of course… 
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Unlikely. You’d still be in line of sight and less than 100m away.
But I only have a Mavic Mini. 
Anything could happen. 
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Wouldn’t really make any difference.
My Mavic Pro is 8 year old tech and it’s no issue.
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That has OcuSync though, the OG Mini is always gamble
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I reckon the Tello would be good for that … on a window day, of course.
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I wonder if doing a test flight that you drop down level with center of arch then take note of the height drone is flying at then before going through arch set your RTH to that height and it definitely not go higher and will go straight out unscathed.
In theory should work ok but be aware if signal lost and you will need good position to cancel RTH and bring it back manually.
The arch is 200 ft just by visually looking at pictures RTH 40 ft be a guide
I did it years ago with a Mavic Air off the back of my yacht. The biggest problem is people in the arch, on the water and climbing on it. Being anchored in the bay overnight I was able to wait until most had gone home.
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In the summer daytime - I’d agree, hence my suggestion that early morning or evening is preferable.
M-o-W-B is a great anchorage.
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Best time has to be a winter sunrise, when the sun strikes through the arch from the seaward side.
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The Durdle Door arch is 100 ft (30 m) wide and 200 ft (61 m) tall:
Aim your crosshairs at the centre and you’ll be fine … if you dont make it then a used mini 3 Pro is cheap as chips nowadays. 
PS. Not being negative or owt but swap out your microSD card for a small blank one and screen record your flight before you take the plunge (pun intended). 
Visually, yes. But there is evidence that heading towards a low sun can interfere with the OA at times … which would be far from ideal in that scenario.
Thanks for the tip but in the unlikely event I ever do fly down there it’ll be with with a “proper” FPV quad, not a DJI, and I can make far smaller gaps than that.
To be clear, I do have an OG Mavic Mini, but I don’t only have a Mavic Mini (see profile) and I’ve probably flown it a handful of times for a total of less than half an hour in the past few years. I don’t even have Airdata handy on my phone anymore to check this claim. The above statement was simply an attempt at being humorous, which has clearly missed the mark somewhat. 
Having said that, if it has prompted advice which may be helpful to the flying tripod crew then it can’t be all bad.
Pardon my intrusion. I’ll be on my way and trouble you no further. 
P.S: There you go.
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I think we are all guilty of having a cheeky blink when we think noone from the CAA is looking. I for one cant stand the guilt any longer and have come up with a plan.
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@Earwig Haha, didn’t even notice it was you who had posted the comment TBH, Jez.
As a fully paid up member of the tripod crew, I bow to your prowess as an equally experienced member of the swoopy tricky dizzy mob. 
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