Reply to: Question for the experts: Why don't boats have gear boxes

[Churchill]

It ain't exactly hard to hit a ship. Take one rocket, tell it to fly a few feet above the water, point generally in the direction of a ship, light blue touch paper.

The best defence is to stop the planes taking off in the first place. Which is what won it for the BRITISH when you add it all up.

FTFY

[threaded]

OK then - why were the ships anti aircraft systems so pants during the Falklands?

It ain't exactly hard to hit a ship. Take one rocket, tell it to fly a few feet above the water, point generally in the direction of a ship, light blue touch paper.

The best defence is to stop the planes taking off in the first place. Which is what won it for the English when you add it all up.

[Troll]

Not so good on engines. They are too oily.

I can talk to you about ship weapon systems if you like?

OK then - why were the ships anti aircraft systems so pants during the Falklands?

[Moscow Mule]

Not so good on engines. They are too oily.

I can talk to you about ship weapon systems if you like?

[threaded]

can someone call Alexey,

I reckon we might have found the first subject in 10 years, where we don't have a CUK expert !

Milan.

Define 'expert'. I did a ship recognition badge in the Boy Scouts, or was it Lloyds Register. It was a long time ago.

[milanbenes]

can someone call Alexey,

I reckon we might have found the first subject in 10 years, where we don't have a CUK expert !

Milan.

[Moscow Mule]

Milan,

The boats you have been looking at are automatics.

Manly hugs

MM

[Troll]

So what happens if you use a diesel to power en electric motor to produce a jet rather than turn a prop?

http://www.camarc.com/Reference%20Do...propellers.pdf

[milanbenes]

TW,

'most boats' is rather a generalisation what

if we discard under powered fishing boats, marine contractors, ferries and cruisers,

the rest are fast acceleration and top speed machines, think about water skiing

Milan.

[TimberWolf]

Interesting though, a question which on the face of it looks silly, interesting that there does not seem to be a definitive answer.

Funny to see the argument about whether turning a prop in water is easier than a car wheel on a flat road.

I loved that comment, go and run through the swimming pool and see what happens.

You can see directly from the acceleration how great or little force the prop is generating (F=MA). For the most part boats accelerate relatively slowly, a small force.

[milanbenes]

Zeity,

moi ?


Interesting though, a question which on the face of it looks silly, interesting that there does not seem to be a definitive answer.

Funny to see the argument about whether turning a prop in water is easier than a car wheel on a flat road.

I loved that comment, go and run through the swimming pool and see what happens.

Even the jury is out among the CUK experts.

Milan.

[threaded]

Gosh - the ignorance in some of those posts is amazing, stay in IT people!

Yeah, they're making me to laugh muchly.

Some aircraft do have variable speed gearboxes.

There is at least one helicopter with two variable speed gearboxes, one for the main rotor and one for the tail rotor, and they're independent.

Have to say they're not very common due to Jesus bolt issues. But darned helpful if you want to extend that ceiling.

HTH

[TimberWolf]

There's a chap here who reckons oars are more efficient than propellers.

[scooterscot]

Gosh - the ignorance in some of those posts is amazing, stay in IT people!

Have you ever tried turning a prop even at low revs in salt water? It takes a considerable amount of energy you know. The weight or volume of water that is displaced every second I think may surprise you.

[scooterscot]

I used to work on the Navy's type-23 frigates - there's a whole room dedicated to the gear boxes. Unsurprisingly it's called the gear room.

The vessel is fitted with gas turbines you see, not a massive engine with pistons, which I fear is what your thinking.

If you ever get the chance to get in the engine room of a type-23 you'd think your at the airport.