Boat & Hovercraft in a River Challenge

[Silent1]

There's a boat and a hovercraft in a channel of water.

The water flows at the same speed as the vessels but in the opposite direction to their travel.


Would the boat move forwards?
Would the hovercraft move forwards?


ETA. the boat is powered by a conventional propellor.

Edited by Silent1 on Saturday 31st January 11:40

[BMWBen]

Boat, no.
Hovercraft, yes.

[dan1981]

Stop it you.

[Silent1]

No-one else going to have a go then?

[BMWBen]

hehe

[DrTre]

you put the fox and the corn on the boat, and the chicken on the hovercraft and then build a bridge out of Heinz Wolf

[pokethepope]

How is the boat propelled? Sail, engine + propellor?

[Bushmaster]

Given that a hovercraft can move equally well on stationery land, it isn't going to have a problem with water regardless of the direction it's flowing.

[Mr MoJo]

Boat
Hovercraft

[pokethepope]

Probably wrong but:

A boat with an engine and propellor is propelled by 'pushing' the water behind it, right? If the water is already flowing in this direction, won't the water already moving that way help it along more?

Or does it negate the spin of the propellor because the body of water is moving 'under' the boat rather being 'pushed' behind it?

[Galileo]

Silent1 said:

No-one else going to have a go then?

stop it.

[Silent1]

Galileo said:

Silent1 said:

No-one else going to have a go then?

stop it.

Look, it's a simple test, everyone who gets all of them wrong will be shot.

[jeff m]

Foreward motion of the boat is by water propulsion.
Hovercraft is air propulsion.

In practice the hovercraft would be impeded but would move ahead of the boat.

I suppose

[Ozzie Osmond]

Boat stationary; hovercraft moves.

But here's another.
A 1 ton boat displaces an amount of water equal to its mass.
A 1 ton helicopter is free flying and when flying normally over water does not displace any water.

How much water does a 1 ton hovercraft displace?

[jeff m]

Ozzie Osmond said:

Boat stationary; hovercraft moves.

But here's another.
A 1 ton boat displaces an amount of water equal to its mass.
A 1 ton helicopter is free flying and when flying normally over water does not displace any water.

How much water does a 1 ton hovercraft displace?

Seawater or fresh?

The amount equal to the downthrust of the engines, more than one ton.

Edited by jeff m on Saturday 31st January 16:08

[12joe340]

Silent1 said:

The water flows at the same speed as the vessels but in the opposite direction to their travel.

Edited by Silent1 on Saturday 31st January 11:40

if the water has a speed then both hovercraft and boat have a speed so neither can be stationary

[Poledriver]

Aaaaaaaaaarrgh! Not another one!

Edited by Poledriver on Saturday 31st January 18:32

[moleamol]

12joe340 said:

Silent1 said:

The water flows at the same speed as the vessels but in the opposite direction to their travel.

Edited by Silent1 on Saturday 31st January 11:40

if the water has a speed then both hovercraft and boat have a speed so neither can be stationary

Que?

[jeff m]

Joe
Solve +4 - 4 =

[Olivero]

DrTre said:

you put the fox and the corn on the boat, and the chicken on the hovercraft and then build a bridge out of Heinz Wolf

Kill the chicken, then the fox, put them both onto the boat with the corn. The wolf can just piss off.