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Flying under a large bridge

Joe_Scot

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I'm interested know of people's experiences of flying under a large bridge (or any other large structure where the GPS signal might be lost). Does the Anafi continue to fly as you'd expect, or does losing the GPS signal cause major problems. Haven't dared to try it yet myself! Also, would flying manually or using Flight Plan be the best option? Cheers.
 

davyg

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shouldn't make any difference unless the span is very wide and blocks out any GPS or signal back to the controller.....


 
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Agustine

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You will lose both Sat modes and possibly the entire aircraft.
Losing Sats with the Anafi is not a big deal. It fles just fine in doors with out sats. What will cause you problems is if you lose connection and it wants to return to home when you are under a bridge. Unfortunately there is no way to turn that option off.
 
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Rocky the FS

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....Also, would flying manually or using Flight Plan be the best option? Cheers.
You can fly manually under anything that cuts off the GPS signal PROVIDED you do NOT lose the Wifi connection. If that happened, the Anafi would go into RTH mode and fly up to whatever the RTH altitude was set at, probably crashing into the the bridge. The way to ensure that you don't lose Wifi is to follow the drone under the obstruction and keep it within 50 to 100 feet. Wifi signal strength may be poor under the obstruction and that is the reason to follow it so closely. The height of the bridge and the width of it will have a great deal to do with the success or failure. For instance, the Golden Gate is four lanes wide, but it's 220 feet high....you could fly your Anafi under it from your boat with no problems, or even from the beach at the end. Trying to fly under a four lane bridge that is only 20 feet high might not work unless you could walk under it or at least keep the drone in good line of sight until it got out the other side.

As I understand it, when using a Flight Plan losing Wifi connection with the Anafi is not a problem as it will continue to fly the Plan to the end. However, losing GPS at the drone will cause it to abandon the Flight Plan and initiate RTH and crash into any overhead obstruction unless it is above the RTH altitude.....which you can set as low as 20 feet if I recall.

I would test this with a small bridge before trying a large bridge! :eek:
 
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Joe_Scot

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You can fly manually under anything that cuts off the GPS signal PROVIDED you do NOT lose the Wifi connection. If that happened, the Anafi would go into RTH mode and fly up to whatever the RTH altitude was set at, probably crashing into the the bridge. The way to ensure that you don't lose Wifi is to follow the drone under the obstruction and keep it within 50 to 100 feet. Wifi signal strength may be poor under the obstruction and that is the reason to follow it so closely. The height of the bridge and the width of it will have a great deal to do with the success or failure. For instance, the Golden Gate is four lanes wide, but it's 220 feet high....you could fly your Anafi under it from your boat with no problems, or even from the beach at the end. Trying to fly under a four lane bridge that is only 20 feet high might not work unless you could walk under it or at least keep the drone in good line of sight until it got out the other side.

As I understand it, when using a Flight Plan losing Wifi connection with the Anafi is not a problem as it will continue to fly the Plan to the end. However, losing GPS at the drone will cause it to abandon the Flight Plan and initiate RTH and crash into any overhead obstruction unless it is above the RTH altitude.....which you can set as low as 20 feet if I recall.

I would test this with a small bridge before trying a large bridge! :eek:

Good advice - many thanks. Had concerns re flight plan as you suggest above. I guess if possible, setting a very low RTH altitude (other things being equal) might solve that, but could still be risky. I have in fact flown under a very narrow bridge without issues, but have not yet dared to go under something more substantial!

shouldn't make any difference unless the span is very wide and blocks out any GPS or signal back to the controller.....


Thanks - good to see example in your video. Certainly makes for some nice footage!
 

Rich Z

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Bear in mind that if the Anafi gets triggered to RTH while any portion of the bridge's vertical support structure is between the drone and yourself, this will likely result in a rather bad day for you.
 

Rocky the FS

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Yes, that is because any interruption of the Wifi signal of more than a second or so will trigger RTH.
 

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