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An amphibian that sank?



 
 
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  #41  
Old April 24th 06, 11:24 PM posted to rec.aviation.piloting,rec.aviation.homebuilt
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Default An amphibian that sank?


"Chris W" wrote

Didn't the "Myth Busters" sink a boat and try to float it again by filling
it with ping-pong balls? If I remember right something on the boat broke,
and all the ping-pong balls spilled out.


Yep, a hatch gave way, but they screwed a piece of plywood on it, and then
brought to the surface.
--
Jim in NC


  #42  
Old April 25th 06, 01:06 AM posted to rec.aviation.piloting,rec.aviation.homebuilt
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Default An amphibian that sank?

Flyingmonk wrote:

http://www.divingservices.net/aircraft.jpg
http://www.divingservices.net/9bcess2.jpg

Anyone have the story behind this? Strange that a plane designed to
float, sank!

The Monk

So was the Titanic! ;-)

  #43  
Old April 25th 06, 07:39 AM posted to rec.aviation.piloting,rec.aviation.homebuilt
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Default An amphibian that sank?


"Dudley Henriques" wrote in message
link.net...

"Flyingmonk" wrote in message
ups.com...
http://www.divingservices.net/aircraft.jpg
http://www.divingservices.net/9bcess2.jpg

Anyone have the story behind this? Strange that a plane designed to
float, sank!

The Monk


I could be wrong, but wasn't the Titanic designed to float?
:-)
DH


As I recall it even had lots of watertight compartments designed so that you
could flood several of them and the Titanic would still float. Unsinkable,
they called it. After it sank, the Unsinkable title was transferred to
Molly Brown of Denver. :-)

Highflyer
Highflight Aviation Services
Pinckneyville Airport ( PJY )


  #44  
Old April 26th 06, 09:32 PM posted to rec.aviation.piloting,rec.aviation.homebuilt
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Default An amphibian that sank?

In article ,
John Kimmel wrote:
Roy Smith wrote:

One of the fundamental truths of boat design is that the center of gravity
has to be lower than the center of bouyancy. If it's not, then eventually
the boat (helicopter, whatever) will figure out how to turn itself over so
that it is.


Absolutly wrong.


Beg to differ. The only _truly_stable_ geometry is 'heavy side down, light
side up'.

One _can_ design craft with a secondary, 'meta-stable', mode that is
'heavy side up'. one of the simplest examples of which is a catamaran.

The center of bouyancy of most large boats and ships
is well below the center of gravity.


Which is why most large boats and ships, *when*sufficiently*provoked*,
_will_ turn turtle.

The proof that the 'normal' mode of such craft is _not_ stable is shown
by the fact that there is a far larger range of 'roll attitude' from which
the ship will go 'bottom up', than there is where it will return upright.
And, once a ship _does_ go over, it is very, *VERY* difficult to get it
back upright. Anybody who has sailed a small sailboat is well aware of this;
it is all too easy to tip it over, and *way* more difficult to get it back
upright.
  #45  
Old April 26th 06, 09:54 PM posted to rec.aviation.homebuilt
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Default An amphibian that sank?

In article ,
Ron Wanttaja wrote:
On 23 Apr 2006 13:56:44 -0700, "Flyingmonk" wrote:

Anyone have the story behind this? Strange that a plane designed to
float, sank!


Friend of mine had built an Osprey II amphibian and planned to make its first
flight from the water instead of land. He took it down the seaplane ramp for
water-taxi testing. A few minutes after hitting the lake, he noticed water
sloshing around on the bottom of plane. When he'd gone down the seaplane ramp,
the nose of the plane had pitch up when it hit the water, ramming the tail skid
into the fuselage and leaving a bit of a large hole.

He poured on the power to go back to the ramp. When he got close, he cut power
and flipped the Armstrong gear lever. But when the gear hit the ramp, the mains
collapsed. Turns out the primary landing gear torque tube had been undersized
(design error).

My buddy paid for a forklift to carry his plane back to the hangar. There, he
set the bottle jack under the wing to jack the plane up so that he could lower
the gear back down. The jack slipped, punching a hole in the bottom of the
wing.



A clear-cut example of O'Brien's Law at work!



 




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