P3A fell out of sky... can someone look at data and explain???

[Yiannis.B]

Hovering generates a whole heck of a lot more load than sitting on the ground with the motors idle! Try hovering in place and see how long you can stay up.

I don't need to try it. I've been around long enough to know that hovering loads are nothing when compared to in flight loads. I also read numerous amounts of flight data daily. I have the ability to see how much load each of the 4 motors is under at any part of the flight. And it's because of that is why I responded to the hovering statement.

The truth is in-between.

" Flight School 5: Power Efficiency Hover vs. Forward Flight

RC aircraft, in particular RC helicopters and quadcopters have idiosyncrasies regarding their flight characteristics that should be considered to fully appreciate their capabilities. For instance, I like to keep some forward motion on my quadcopter at all times as it requires much less power than hovering. This phenomenon is known as "helicopter translational lift" (Google it for detailed info). I know this seems counter-intuitive, but it's very true. The forward motion provides airflow over the blades, which enhances the lift on the quadcopter. As such, forward flight is much better for motor life and to increase battery flight time. IMO keeping some forward motion also allows for more entertaining flight video than simple hover views.

However, there is a limit speed that if you exceed the aerodynamic drag on the quadcopter will start to kick in, requiring extra power to overcome. In effect, flying high speed runs are less efficient than hovering. You need to determine a sweet spot of forward speed that will give you efficient flight. You can gauge an efficient speed by listening to the motors. After takeoff hover, apply some forward pitch to increase speed. You should notice that you'll soon need to reduce power to maintain the altitude. "

Flight School 5: Power Efficiency Hover vs. Forward Flight | Quadcopter Flight School


Check out this video about helicopter take off and the links below:

Ground effect (aerodynamics) - Wikipedia, the free encyclopedia
Translational lift - Wikipedia, the free encyclopedia

I think that we are off-topic .

 

[BayouBill]

I think that we are off-topic. I'll second that motion. Gee whiz, I was just trying to point out that a significant load is necessary to check battery cell condition. Good point, though, on forward flight being more efficient than hovering.

 

[SnoozeDoggyDog]

Maybe you're not feeling very well at the moment. You're feeling a little light-headed and a bit naseous, and you'll have to leave a little early this afternoon...

Get used to that feeling .... It's how I feel pretty much as soon as I stick a battery in my p3a and it doesn't go away until I've packed it away!

 

[SnoozeDoggyDog]

According to the DatCon KML and CSV (and your TXT flight log), you did a CSC on top of your neighbor's house. Your sticks were in this position at that time:

View attachment 60128

View attachment 60127

Ouch!

 

[SnoozeDoggyDog]

M Singer - did you notice the total silence from the battery critics crowd? As you ALWAYS say. Don't jump to conclusions before you see the data!


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Msinger posts are the ones that always get my attention. Always worth taking note of even if you're just scanning topics.

 

[cbgeorge]

You should not take off unless battery is fully charged. Sometimes it causes battery % in app to be inaccurate.


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It is hard to take off with a 100% battery unless it was freshly charged, and by the time you get to take off it is 98 or 97% If charged a battery early this morning and fly tonight or tomorrow am, it will show 96- 97%

 

[msinger]

It is hard to take off with a 100% battery unless it was freshly charged, and by the time you get to take off it is 98 or 97% If charged a battery early this morning and fly tonight or tomorrow am, it will show 96- 97%

That's perfectly fine. It does not need to be at 100%.

 

[Wmich06]

i dont understand, if holding the left stick down for 3 seconds turns off the motors when landing then how come when i descend straight down from a height of 400ft for longer than 3 seconds the motors dont turn off? Does it have to do with the ground sensors?

 

[N017RW]

The aircraft has sesnsors which detect motion in 3 dimensions. It is able to determine if it has landed or is still descending.
So software makes the determination between descending and stationary and adjusts the actions accordingly.

 

[Wmich06]

Then why would holding both sticks downward and in or out at the same time make it shut down? Why wouldn't they program that to detect ground or airborne as well

 

[msinger]

Then why would holding both sticks downward and in or out at the same time make it shut down? Why wouldn't they program that to detect ground or airborne as well

It's designed to shut off the motors mid-flight. You aren't supposed to do it mid-flight though unless you really want to kill the motors

 

[BayouBill]

Then why would holding both sticks downward and in or out at the same time make it shut down? Why wouldn't they program that to detect ground or airborne as well

It is the last ditch method of stopping a fly-away or as a safety measure to kill the motors if the throttle down method does not work for some reason.

 

[flyNfrank]

Talking about Wind Drag this has been a recent ongoing project I have been messing around with. I do not have the data collected yet on what I'm working with for a comparison. I'm hoping I will get the type of results that are earth shattering....but as we know that is asking more then it's capable of.

What has my attention the most is what effect the setup I'm using shown above has from the wind deflecting from the nose and up into the propellers. That would be like simulating a updraft. I suppose it could go either way in that the aircraft might react as though it is lighter and become more efficient, or it might cause a disturbance causing the propulsion system to work against itself.

Well eventually I'll get some data collected with & without to a comparison.

 

[JamesBandes]

was flying to show a friend how it will return Home so battery was low around 32%, so I flew it over about 100 feet high and about 150 feet away when all of a sudden it fell to the ground.... I have the files zipped but it says the files are too large so I may need some help there too posting....

If it just fell out of the sky sounds like a CRC. Did you pull both sticks down and in while it was in flight?

 

[msinger]

Did you pull both sticks down and in while it was in flight?

Yes. See this post.

 

[Billisminimus]

Yes I did, new gimbal just came in and I put it on and she is back in the sky!!! No more flying like a "jet fighter" for me lol


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[essence25]

View attachment 60573


Talking about Wind Drag this has been a recent ongoing project I have been messing around with. I do not have the data collected yet on what I'm working with for a comparison. I'm hoping I will get the type of results that are earth shattering....but as we know that is asking more then it's capable of.

What has my attention the most is what effect the setup I'm using shown above has from the wind deflecting from the nose and up into the propellers. That would be like simulating a updraft. I suppose it could go either way in that the aircraft might react as though it is lighter and become more efficient, or it might cause a disturbance causing the propulsion system to work against itself.

Well eventually I'll get some data collected with & without to a comparison.

Wow, just when I thought I've seen it all, Sally had to show us her tits... That is very interesting. I'm curious if it does help at all. Just be careful so it wont go into the spinning props.

 

[Dan MacNeil]

I guess that means that not everyone on the internet has read your posts.

GOOD POINT! I almost NEVER post in forums. I get lots of info from forums and such as I have been making my living providing website and Internet services for over 20 years now. But over the years I've learned that NO MATTER WHAT YOU POST IN A FORUM, IF YOUR POST RECEIVES MORE THAN A HALF DOZEN RESPONSES YOU WILL GET SCOLDED LECTURED AND RIDICULED. It seems that forum types (people who spend inordinate amounts of time in forums) just tend to struggle with providing basic answers to basic questions. I mean, wouldn't it be nice if people said things like "You should start every new flight with a fully charged battery..." (or similar) without having to remind the person of what a complete idiot/buffoon they are for not having made themselves aware of everything ever posted on the internet.
Further, I know there are some types who enjoy being humiliated (I believe the terms for these are bondage, dominance, submission etc.) and some who seek such services will actually pay large amounts of money on porn type websites to get that type of services. Perhaps those people who seek such satisfaction should just come to a forum website and post questions like "Why did my drone crash?" Just sayin'

 

[Michael M]

Send it to dji.
They even say make sure you batteries are charged at least to 50%, which you did.
Let warranty take over

 

[msinger]

Send it to dji.
They even say make sure you batteries are charged at least to 50%, which you did.
Let warranty take over

The warranty will not cover a CSC mid-flight.