Unstable altitude flying under trees

[BrianSC]

Hi all

The other day I flew the Spark under and between trees close to the coast line. I put it in tripod mode to make some footage between the trees. This was my first time doing footage like that. Plenty of sattelites, no compas error, etc. I checked the flight record and it did not go into ATTI mode at any point, as far as I can see.
The thing is that, the Spark would suddenly start to lose or gain altitude, or even going a bit side ways, while flyting between the trees, so much that I had to stop, since I couldn't trust it not to fly into a tree or hit the te ground or branches above, even though I tried to fly in a straight line and didn't change altitude.

One away from the trees, it went back to normal.

I have seen plenty of footage of people flying between trees, etc. so I believe this wasn't normal behaviour.

Any ideas of why it did this?

 

[Spark 317]

Depending on the height and light conditions, the Spark may be relying on the bottom camera when flying less than 25 feet through a shaded area along with the GPS signal darting in and out the trees that could effect the flight.

You probably have good GPS, but if at a low altitude, it may drift a little if the Spark is VPS.

Just a thought.

 

[BrianSC]

Depending on the height and light conditions, the Spark may be relying on the bottom camera when flying less than 25 feet through a shaded area along with the GPS signal darting in and out the trees that could effect the flight.

You probably have good GPS, but if at a low altitude, it may drift a little if the Spark is VPS.

Just a thought.

Didn’t think of that. I was flying low so it was probably in VPS.

 

[Troy.Spark]

Could it have been that it had rotor wash from the trees. I know if I fly close to a object it has a hard with hover due to the wash vs is I move forward slowly then it tends to be more stable

 

[BrianSC]

Could it have been that it had rotor wash from the trees. I know if I fly close to a object it has a hard with hover due to the wash vs is I move forward slowly then it tends to be more stable

It was hovering, I was flying forward and backward.