submarining?

R

rasbury

Seaman
Joined
Jun 8, 2011
Messages
71
I just watched some awefull youtubes...was watching boat launches gone worng as I keep waiting for my wife to back my truck in the water and then saw something that really scared me but I could not see how it happened...these boats seemed to be moving through the water just fine (smaller boats, like ski or run a bout type boats) when the front ends would disapear under the water nearly sinking the boat- were not big swells or bad weather, what's up with that???
 
M

Maclin

Admiral
Joined
May 27, 2007
Messages
6,761
Re: submarining?

The ones i think you are talking about in regards to submarining are done on purpose by the operator.
 
Philster

Philster

Captain
Joined
Sep 15, 2009
Messages
3,344
Re: submarining?

I believe you are talking about jet drive boats. Operator drives forward at a good clip then suddenly goes full reverse thrust. Boat comes to a halt and the whole boat gets dunked before buoyancy takes over.

Dumb. Lots o' kid fun is dumb... some adult stuff, too....
 
H

H20Rat

Vice Admiral
Joined
Mar 8, 2009
Messages
5,204
Re: submarining?

Yep, probably jet boats... Lots of fun to do and a really quick way to cool off. Believe it or not, there is zero chance of sinking or damage by doing it. (i've done a couple in my jetboat, I've ended up waist deep in water! The boat has 3 electrical bilge pumps and 1 engine suction pump for a reason...)
 
S

sschefer

Rear Admiral
Joined
Nov 13, 2008
Messages
4,530
Re: submarining?

smokingcrater said:
Yep, probably jet boats... Lots of fun to do and a really quick way to cool off. Believe it or not, there is zero chance of sinking or damage by doing it. (i've done a couple in my jetboat, I've ended up waist deep in water! The boat has 3 electrical bilge pumps and 1 engine suction pump for a reason...)
Click to expand...
LOL, their purpose is not for recovering from that type of abuse.. but, I will agree, it is fun!.. Before I bought my current boat I test drove a few jet boats and had a blast doing emergency stops and 360's. Ironically, the 360 can be done in my Jetcraft outboad because of the delta pad hull. Flips around in a second... scared the crap out of me the first time then I found practical uses for it. It's almost like having a bow thruster at the dock, not quite but almost.
 
26aftcab454

26aftcab454

Lieutenant Commander
Joined
May 12, 2009
Messages
1,510
Re: submarining?

smokingcrater said:
Yep, probably jet boats... Lots of fun to do and a really quick way to cool off. Believe it or not, there is zero chance of sinking or damage by doing it. (i've done a couple in my jetboat, I've ended up waist deep in water! The boat has 3 electrical bilge pumps and 1 engine suction pump for a reason...)
Click to expand...

maybe so but what about all your electricals???
 
R

rallyart

Lieutenant Junior Grade
Joined
Jun 7, 2008
Messages
1,184
Re: submarining?

This one: The New Act is a staged submarine that is one of my favorite videos. The driver heads for a roller and throttles back to drop the nose as he reaches it. He then reverses to get as much water out as he can before the engine finally stalls.
On an inboard you don't want to throttle back just as you hit a roller. :facepalm:
 
H

H20Rat

Vice Admiral
Joined
Mar 8, 2009
Messages
5,204
Re: submarining?

26aftcab454 said:
maybe so but what about all your electricals???
Click to expand...

speakers get a little wet, but they have lasted 10 years already and still sound good. There are no other electrical items exposed to water at any point. (gauges, depth finder, amp, head unit, gps, and satellite radio all stay high and dry.) Jet boats essentially have 2 hulls, an inside hull and the outside hull. They are more or less sealed with airspace between them.
 
oops!

oops!

Supreme Mariner
Joined
Oct 18, 2007
Messages
12,932
Re: submarining?

smokingcrater said:
) Jet boats essentially have 2 hulls, an inside hull and the outside hull. They are more or less sealed with airspace between them.
Click to expand...

what?

this is not true bud.
any old hull can be fitted with a jet.

the submarining thing is a stupid move by stupid people.

unless the boat is built for that manoeuvre.......forget it.
 
H

H20Rat

Vice Admiral
Joined
Mar 8, 2009
Messages
5,204
Re: submarining?

oops! said:
what?
this is not true bud.
any old hull can be fitted with a jet.
the submarining thing is a stupid move by stupid people.
unless the boat is built for that manoeuvre.......forget it.
Click to expand...


Pretty sure I'm not classified as stupid... :D I even manage to usually fill out my posts with capitalization, actual sentences, and even punctuation! (95% of the board can't even accomplish that...)


I'm not talking some 1970's open engine jet boat with a big block v8 and a berkeley in back. You submarine one of those and its going straight to the bottom. And yes, someone could even put a jet outboard on a bayliner capri, but most bayliner owners don't need any help sinking their own boat... The op was talking about a youtube submarine video, so I'm fairly sure we all can safely assume what it was...

I'm talking a modern jet (seadoo/sugar sand), which IS built for that. Again, the inner cockpit sole is sealed from the outer hull. There are two bilge pumps that drain the cockpit area only. They do not drain into the outer hull, those bilges pump directly overboard. (I can draw a diagram if you need one...) I can literally take a garden hose and fill the boat up until its running over, and other than some wet speakers, NOTHING is affected. The engine runs fine, there is still enough freeboard, and all you have to do is sit and wait for the pumps to suck it out.

I've got a pic below from a modern jet interior. You can see how the inner hull is sealed, there simply is no opening that leads to the air space in between hulls. The most water I've had from a submarine had me sitting in water. Gauges/controls stayed dry, speakers got wet. Even at full capacity, the gauges/switches would stay dry. (the nose is a little lower, so you could never fill it to the gunwals in back)

So... given all that information, why is that a stupid move?


13_big.jpg
 
DuckHunterJon

DuckHunterJon

Lieutenant Junior Grade
Joined
Apr 19, 2010
Messages
1,082
Re: submarining?

I'm not going to jump into the argument of whether or not electronics will get wet - but I gotta ask - WHY??? Isn't it a whole lot less work to coast to a stop and jump overboard? Seems kind of like running your car into a telephone instead of just using the brakes. Doesn't make sense to me.
 
mpdive

mpdive

Chief Petty Officer
Joined
Apr 23, 2011
Messages
567
Re: submarining?

DuckHunterJon said:
I'm not going to jump into the argument of whether or not electronics will get wet - but I gotta ask - WHY??? Isn't it a whole lot less work to coast to a stop and jump overboard? Seems kind of like running your car into a telephone instead of just using the brakes. Doesn't make sense to me.
Click to expand...

WHY? WHY I ASK? I don't get it. I'm with duckhunter on this one...:eek::facepalm:
 
'78 Crusader

'78 Crusader

Chief Petty Officer
Joined
Mar 15, 2011
Messages
407
Re: submarining?

smokingcrater said:
Pretty sure I'm not classified as stupid... :D I even manage to usually fill out my posts with capitalization, actual sentences, and even punctuation! (95% of the board can't even accomplish that...)


I'm not talking some 1970's open engine jet boat with a big block v8 and a berkeley in back. You submarine one of those and its going straight to the bottom. And yes, someone could even put a jet outboard on a bayliner capri, but most bayliner owners don't need any help sinking their own boat... The op was talking about a youtube submarine video, so I'm fairly sure we all can safely assume what it was...

I'm talking a modern jet (seadoo/sugar sand), which IS built for that. Again, the inner cockpit sole is sealed from the outer hull. There are two bilge pumps that drain the cockpit area only. They do not drain into the outer hull, those bilges pump directly overboard. (I can draw a diagram if you need one...) I can literally take a garden hose and fill the boat up until its running over, and other than some wet speakers, NOTHING is affected. The engine runs fine, there is still enough freeboard, and all you have to do is sit and wait for the pumps to suck it out.

I've got a pic below from a modern jet interior. You can see how the inner hull is sealed, there simply is no opening that leads to the air space in between hulls. The most water I've had from a submarine had me sitting in water. Gauges/controls stayed dry, speakers got wet. Even at full capacity, the gauges/switches would stay dry. (the nose is a little lower, so you could never fill it to the gunwals in back)

So... given all that information, why is that a stupid move?


13_big.jpg
Click to expand...

There's not "Two" hulls on this modern jet. There's a single hull and an interior "cap"...which may or may not be sealed. If the boat had two hulls....there'd be two layes on the bottom of the boat along with this upper interior cap.

None the less...the cap itself will still leak into the hull and if it's filled with foam, the foam will eventually become saturated and become very heavy.
 
H

hog88

Petty Officer 2nd Class
Joined
Jun 24, 2011
Messages
112
Re: submarining?

No way would I even think of attempting something like that with my boat. That is just a denied insurance claim waiting to happen.
 
M

Maclin

Admiral
Joined
May 27, 2007
Messages
6,761
Re: submarining?

The video posted was of a maneuver that was NOT intended to end like that. It was at a Water Ski show, the operator did not notice a trough left by a preceding act, and ill-timed his maneuver. That was not a jet boat, and needed lots of attention after that.
 
smokeonthewater

smokeonthewater

Fleet Admiral
Joined
Dec 3, 2009
Messages
9,838
Re: submarining?

Sorry folks I HAVE to chime in..... These JETSKI'S that only LOOK like boats are a different animal.... a little water over the bow isn't the end of the world. Could the maneuver be dangerous? SURE! Is it potentially hard on the vessel? SURE! Do we REALLY need to ask why? have you ever watched younger people ride dirtbike's, jetski's, atv's etc? It's about the adrenaline rush.... Of course there are easier methods... these folks are looking to have fun.

BTW I routinely spin my little 10' jetboat so as to take a few gallons over the bow and then gas it.... the self bailing deck sends the water overboard..... After a day of aggressive riding I might have a gallon or two in the bilge if I don't run the pump. ALL of the electronics are sealed in a waterproof box (from yamaha) and even the stator has a sealed cover.
 
You must log in or register to reply here.
Top