Litchi - speed to reach waypoint altitude

[InforGuy]

Hi Folks - Not sure how to really articulate my question so I like to use photographs from time to time. The answer may be obvious but would rather be safe than sorry. If you take a look at the photo below, I would like to do something very simple - start at a way point in the street at probably around 3-5 ft. then fly diagonally over the house to a way point that is roughly 40 ft in the air. Other than fly really slow and be ready to abort the mission, is there a way I can ensure I will ascend at a rate that will allow me to clear the top of the house? Would it be better to add a way point above the home at an altitude I know will be safe and therefore eliminate any question?

 

[tevek]

Hmm, looking at the photo suggests that you would miss the top of the house assuming the height of the highest part of the house was no more than 15-17 feet at mid point and the house is at the same level as your take off point. You could run the mission at a very slow speed and be ready to abort it I guess and if successful speed it up the next time and add additional waypoints or whatever with a bit of confidence.

 

[InforGuy]

Hmm, looking at the photo suggests that you would miss the top of the house assuming the height of the highest part of the house was no more than 15-17 feet at mid point and the house is at the same level as your take off point. You could run the mission at a very slow speed and be ready to abort it I guess and if successful speed it up the next time and add additional way points or whatever with a bit of confidence.

Yeah, I think I may have answered my own question as I posted. I can always add a way point just before the roof and one at the highest point at the proper heights to be safe. Think I may give it a shot just flying really slow to see what happens making sure I can abort if need be.

 

[BryanBTX]

Add two more waypoints. One at each roof junction. That way you don't clip the roof as your trying to descend to last waypoint if its low.

 

[PinnacleRun]

I add extra way points too and those waypoint do not have any actions as they are set up to establish the height I wanted.


Sent from my iPhone using PhantomPilots

 

[Richard R]

Definitely add that waypoint before the house with enough height to clear the house with some margin (altitudes aren't real precise)

 

[InforGuy]

Thanks for all of the responses guys. Sounds like this is coming down to common sense. Much appreciated.

 

[Meat]

Definitely add that waypoint before the house with enough height to clear the house with some margin (altitudes aren't real precise)

I concur that "altitudes aren't real precise" and I discovered this during my very first Litchi waypoint mission. At the final waypoint of my mission (set at the take-off point) my quad descended to an altitude of 10-12 feet and hovered directly in front of me at that altitude. However, I had set the final waypoint to 33 ft. above my home point. That's a 20+ foot difference.

I love using Litchi and I use it almost exclusively but frankly, I don't think I'd be using Litchi in a situation where precise altitudes are that critical.

 

[Richard R]

Or any of the "hobby class drones". Unless they have a compensated, no altimeter is that accurate, for reference only. Manned aircraft have to compensate for both changing temperature and atmospheric pressure.