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

Started 11/14/20 by Showtalk; 8899 views.
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 

12/11/20

Wait until the cameras get smaller.
Showtalk
Host

From: Showtalk 

12/12/20

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

Showtalk
Host

From: Showtalk 

12/12/20

But how would you know where to position the water to catch a drone? A drone that might never fly over it.

Showtalk
Host

From: Showtalk 

12/12/20

You and Amazon delivery service.

I already have seen some affordable tiny cameras. Before long one can get incredibly sharp and clear pictures from drones small enough to be mistaken for insects.

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