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Topic: URGENT - need help (Read 3019 times) previous topic - next topic

GoForSmoke

My quadcopter lost contact with my controller when it went underwater (like in the old TV series Voyage to the Bottom of the Sea). How can I fix this quickly before it sinks completely out of sight. It's in a deep lake.

...R
Flying a quadcopter w/o floats over water, might be a lesson there that can be generalized under safe places to operate?

Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

Qdeathstar

@robin, my dji phantom ran low on batteries and sank about 15ft to the bottom of a 10ft waterfall. I jogged about a mile back to my truck to get some googles (to locate then drone) jogged back and swam down and got the drone. the lights on it were still blinking. I took the battery out, oiled the motors and it was flying the next day. I trashed the battery because i didn't really trust it and with it being lithium ion i was kind of nervous about it....
A creaking creeping shadow
stiff against the freezing fog
glares at a tickless watch.

Time has failed him -- all things shall pass.

Robin2

@robin, my dji phantom ran low on batteries ...
Thank you for those who thought I was being serious - sorry to say I was not.

I had been hoping to revive the original spirit of this Thread.

...R
Two or three hours spent thinking and reading documentation solves most programming problems.

ardly

@robin with folk jogging two miles then swimming down 15ft into a pool below a waterfall to get a quadcopter either the spirit has been revived or truth is stranger than fiction.
"Facts do not cease to exist because they are ignored" - Aldous Huxley

Qdeathstar

floats don't work on heavier drowns. They either disturb the prop-wash to much or don't keep the drone afloat.
A creaking creeping shadow
stiff against the freezing fog
glares at a tickless watch.

Time has failed him -- all things shall pass.

ardly

Quote
floats don't work on heavier drowns
How heavy are you talking?
I don't understand why a float would disturb the prop wash, don't the props stop if the drone hits water?
Is this a regular occurrence?
"Facts do not cease to exist because they are ignored" - Aldous Huxley

GoForSmoke

Somebody just don't try much. You want to run over water, make a flying boat.

1 cubic cm of air space can float just next to 1 gram of copter. 1 lb is 454 grams, half a liter.
The fans don't touch (room between) and the bottom has no propwash. Floats can go outboard of the props.
Maybe the fan ducts could also be floats.


Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

Delta_G

Somebody just don't try much. You want to run over water, make a flying boat.

1 cubic cm of air space can float just next to 1 gram of copter. 1 lb is 454 grams, half a liter.
The fans don't touch (room between) and the bottom has no propwash. Floats can go outboard of the props.
Maybe the fan ducts could also be floats.



Airbags and a moisture sensor to deploy them?
If at first you don't succeed, up - home - sudo - enter.

GoForSmoke

You wouldn't need much there, as the volume of the drone sinks it is also buoyed up.

I figured that some tubes under the body and on the sides as space allows should go far. There might be a camera there too.

If the drone goes under due to power fail, where does the automation to deploy floats get power to run?
Nick Gammon on multitasking Arduinos:
1) http://gammon.com.au/blink
2) http://gammon.com.au/serial
3) http://gammon.com.au/interrupts

Robin2

Airbags and a moisture sensor to deploy them?
Just put a marine propeller on the back, a rudder and hydrovanes (is that the right word?) for stability and keep going.

...R
Two or three hours spent thinking and reading documentation solves most programming problems.

ardly

I thought about having a chemical that releases gas when it comes into contact with water to inflate a float, of course all these things add, weight and drag.

Whilst thinking about this I looked up Sodium Bicarbonate which people take for upset stomachs. It seems the recommended dose is safe but research showed that most people went way beyond a half-teaspoon and ;

Quote
Some people selected doses of bicarbonate that would result in several hundred milliliters of gas release within 3 min; it seems likely that such injudicious ingestion of sodium bicarbonate, if taken when the stomach was distended with air, food, and liquid, could be an important factor in spontaneous gastric rupture.
https://www.ncbi.nlm.nih.gov/pubmed/6090255

Good grief!
"Facts do not cease to exist because they are ignored" - Aldous Huxley

AWOL

"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.
I speak for myself, not Arduino.

Henry_Best

A lump of sodium?
Only if you don't want your 'copter to survive the explosion.

AWOL

Yeah but I've seen sodium skittering across the surface of water on its own cushion of hydrogen.
Of course, the additional weight of the heat-proof tiles would limit battery life.
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.
I speak for myself, not Arduino.

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