Firefighting drones make their debut in China

[u/FruitOrchards]

[u/blackmamba329]

I wonder what the friction loss is on that

[u/ironmatic1 → u/blackmamba329]

Nothing compared to elevation

[u/Fif112 → u/ironmatic1]

Forgive me if I’m wrong, but since they’re using hose and not pumping up a standpipe, isn’t the pressure loss per hydraulic length more than the pressure loss due to elevation?

Assuming they’re using a smaller diameter hose, considering the drone has to lift the hose plus the water in it.

Sorry, I’m new to pumping and any explanation would be appreciated!

[u/Sad-Pay5915 → u/Fif112]

You need to overcome both those issues. I’d be curious how many gpm they’re getting out of that setup.

[u/MuscularShlong → u/Sad-Pay5915]

It doesnt look like much lol.

[u/Fif112 → u/Sad-Pay5915]

Sorry yeah that is what I meant!

Just figured that more pressure loss would be because of friction than because of elevation

[u/Unstablemedic49 → u/Sad-Pay5915]

Not enough to overtake the BTUs from the fire. It looks like the water is just turning to steam.

[u/fetal_genocide → u/Unstablemedic49]

Looks like they're spraying foam.

[u/[deleted] → u/Sad-Pay5915]

You know the captains who always want a 2 1/2” line will lose their minds when they see this! lol