Bump detection with landing WPs

[LPR]

I found that bump detection with a landing WPs can be a problem. My 4.5 kg quad can fly over 25 m/s so I have been flying at 20 m/s and seeing good results.

Yesterday I was surprised by seeing all the props stop when the quad was 25 meters above the ground. I was very lucky to have soft ground for the quad to crash in so only two landing gear needed to be replaced.

Looking at the log, now I see that I got over 1.5 g on the Z axis while slowing from 20 m/s.

Having a mission setup to go from 20 m/s to a landing WP is a big problem. From now on I'll always slow the quad down to 5 m/s before using a landing WP. Adding 5 seconds of loiter to the WP before the landing WP would help.

From now on I plan not to use a landing WP no higher than 4 meters above the ground.

Larry

[sandmen]

Hmm, don't know, which AQ FW version you have.
But I don't think, that there is a "Bump" detection.
Didn't looked in all code versions, but Bill has removed that some time ago

[bn999]

There has been no bump detection for a long while. During landing, the system continues to ramp down throttle until it hits a minimum threshold and disarms.

[LPR]

Bill and Peter

That's good to know but it still looks like the FC thought it had landed and it turned off the motors. Here's the part of the mission log where the crash happened.

I'm using the latest Quatos FW for the M4.

[LPR]

Here's the message log attached and the complete log of the mission.

https://www.dropbox.com/s/0xv8nvtxm2uue ... L.LOG?dl=0

Larry

[LPR]

I should have posted the mission that I was flying. The mission is attached. I used 20 m for the radius of influence for all of the WPs and that may have been part of the problem with the landing WP.

There's no doubt that I was pushing the limits of a reasonable mission. I'm just trying to find the fastest way to do a photo mission for a farm field. There's no doubt that I found a real fast way to land.

Larry

[chschmid]

[LPR]

Christof

There's no doubt that speed will offer us a number of ways to crash. I think that having motors turn off is the most civilized way to crash.

A 10 meter Helix would be very hard to do at 15 m/s. I would not think you would have enough tilt for that tight of turns at 15 m/s.

Larry

[srinath]

[srinath]