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Should realtors use drones to film your home and property to sell another home?   The Real You: Personality Poll

Started Nov-14 by Showtalk; 5530 views.

Another thing that would be really hard to establish liability, although in a densely populated area you couldn't keep having such a feathered household member secret for long because they eat a lot and also have to do a lot of flying to stay in shape - is the time honored sport of falconry.

A large eagle or other bird of prey can be trained (and many have) to take down drones that intrude over military installations, government buildings, nuclear power plants, and similar places. Some of these birds can quickly climb several thousand feet above the target, then tuck in and dive on the thing at up to 200 mph. The bird, rabbit, kitten, or drone doesn't stand a chance, and never knows what hit it.

But if you've ever handled such a bird - which can weigh more than a grown house cat and have a wingspan that is way too big to handle being cooped up in a typical apartment or house beyond a safe place to sleep at night, and you ought to see how much one of them can defecate - because any organism that has a high intake volume also has a high exhaust volume.

Other than that, they can be incredibly affectionate and can bond with the person who trains it.

Now if you are on the steppes of central Asia, living a nomadic or semi-nomadic lifestyle, the bird becomes the hunting tool to bag a wild mountain goat on a high cliff up the side of a canyon for the family to have supper and breakfast the next day and lunch, and the bird gets a good portion. And then the bird sleeps on your bed post after everyone is well fed.

Showtalk said:

I suspect illegal drone users aren’t calling the police.

Probably not.

Another thing that can be improvised, although it might be "defined" as some kind of destructive device even though it uses no explosive compound - that's something you can bury in the ground that will launch about 5 gallons of water about 50 feet into the air very suddenly using the abrupt release of a lot of compressed air or other convenient gas. The rising slug of water hits the drone with the impact of a baseball bat. Since water is about 800x more dense than air at sea level, the flight rotors tend to not fare too well. And if you use salt water, well, electronics tend to not survive getting soaked with sea water.

And of course once the water falls back to the ground, evidence is kind of gone unless someone arrives really quick with a warrant.

In Vietnam, one feared IED using that basic principle involved not water, but a 55 gallon drum of napalm, buried on top of an anti-tank mine that had been wired to be command detonated, usually beside part of the Ho Chi Minh Trail. The explosion would launch the entire 55 gallons of jellied gasoline nearly a thousand feet into the sky, directly into the path of an unlucky helicopter or low flying spray plane loaded with Agent Orange. A (now deceased - he never could quit smoking) former Special Forces type person said they called it Fougasse, a hold over from the French colony era.

The Viet Cong also used other improvised asymmetrical warfare techniques to down US aircraft during the war.  One was as simple as a large bungee type slingshot which would fling a cluster of beer cans up into the flight path of any aircraft arriving at treetop level. One of two things would happen.

The most usual thing was the terrain following radar would detect the reflections of the metal in the cans, and make an abrupt pull-up to try and miss them, which could over-stress the airframe and make it crash. The second was it slammed into one of the cans at about the speed of a bullet, which would have a similar effect. Since the cans were full of gravel or dirt, they had a lot of weight which impacting at mach 1 would just punch a hole all the way through the aircraft and usually do damage too extensive for the pilot to keep control of it. And at such low altitude, it would happen so fast that there was no time to eject.

We lost a few pilots and aircraft to these, according to the more elderly folks who ended up over there.

kizmet1

From: kizmet1 

Dec-11

Sleeps on the bedpost? Is it housebroken?
kizmet1 said:

What about a garden hose?

To squirt the water at it, or using the hose like a lasso or a bullwhip?

Water pressure increases at roughly 1 atmosphere per 10 meters of hydrostatic head. The inverse of this, is you need a pressure at your faucet that exceeds the hydrostatic pressure of a column of water that will rise to the altitude you try to spray it.

In theory, with a 100% efficient nozzle, a 60 PSI water service through a frictionless hose to the nozzle, would translate the pressure into kinetic energy, and launch the water 40 meters (about 120 feet) into the air.

The reality is, you're lucky if you can get the water 15 to 20 feet into the air with municipal water pressure alone and just a thumb over the hose or a typical squeeze nozzle.

A specially designed nozzle might reach 35 feet into the air from that kind of water pressure, because stream fragmentation and air resistance is going to strip away a lot of the kinetic energy before it reaches the theoretical height, or even gets close to it.

However - if you are really going to put out some serious effort to rig a water based method of bringing down a drone, you want to get a fire pump, something with maybe 2 to 6 horsepower driving the pump, that can boost the pressure to maybe 250 PSI, in the realm you'd see on a fire truck from a pumper, but on a smaller scale.

That is why they have big engines and big pumps on a fire truck - they need a LOT of pressure to get the stream of water from the street level up onto the roof of Notre Dame Cathedral to try and put out a fire.

A typical garden hose would need to be pressure tested if used with a booster pump because most aren't rated at that kind of working pressure (although you probably won't get to the actual burst pressure at only 200 PSI with a new hose.

You want to get a commercial grade hose with a 3/4 inch internal bore all the way through, and your water well or municipal supply needs to be able to deliver at least 15 gallons per minute just to keep the pump from cavitating. And you want a good nozzle that is designed for distance - probably about a 1/4 to 5/16 inch aperture.

Then practice with the pump, hose, and nozzle combination. The recoil from that kind of pressure and volume is substantial. It can knock you down if you're not prepared for it. The water stream packs enough punch to leave bruises on a rioter about to throw a Molotov cocktail.

You also need to be sure your pump will not just keep raising the pressure to a point the hose explodes if you have a valve at the nozzle. An impeller type pump is designed to "slip" at a certain back-pressure, yet deliver a very high volume at a slight pressure reduction.

But with that additional hardware, you could sure bring it down with a garden hose and water. And if you have something like a 200 gallon tank that feeds your fire pump, with, say, a 2 inch diameter intake to really get a LOT of volume, you can get a couple of 50 pound sacks of "pool salt" - just cheap granulated salt - and dump into the tank to make your own simulated sea water.

Spraying the drone with salt water will do enough damage to any non-waterproofed electronics to pretty much brick the thing.

kizmet1 said:

Don't wires get in the way?

In Texas at least, if you collide with power wires with a drone, you're trespassing on the utility right of way, and if it shorts things out and causes an outage, if they can identify whose extra crispy drone flew into the wires, they'll send you the bill for the repairs.

Yeah. The bird sleeps in the tent with the nomads. Or the house if they aren't as nomadic. Or the yert.

If I was to get one, I want a big one that can carry a good camera to do things like inspect roofs and radio towers and things.

kizmet1

From: kizmet1 

Dec-11

Wait until the cameras get smaller.
Showtalk
Host

From: Showtalk 

Dec-12

I’ve read about trained falcons that could do something like that.

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