"Dave Doe" wrote in
.
Indeed the water ballasting *only* has positive righting moment
if the
boat is pushed over to where the centerline is above the
waterline (a
fair way!).




Bzzzzzzt! You are wrong Dave.



PS: if yer don't believe me, fill a milk carton with water and
play with
it in the bath


A scientific study if ever there was one.

SBV

Scotty wrote:
"Dave Doe" wrote in
.
Indeed the water ballasting *only* has positive righting moment if
the boat is pushed over to where the centerline is above the
waterline (a fair way!).

Bzzzzzzt! You are wrong Dave.

Agreed - the boat will start to acquire righting moment as soon as any of
the water ballast is higher than the surface - and there won't be very much
righting moment if only a little of the ballast is above the surface,
improving as the boat heels. IOW, the amount of righting moment varies,
depending on the amount of heel and just how the ballast is arranged within
the hull.


--
Capt Scumbalino

In article ,
says...
Scotty wrote:
"Dave Doe" wrote in
.
Indeed the water ballasting *only* has positive righting moment if
the boat is pushed over to where the centerline is above the
waterline (a fair way!).

Bzzzzzzt! You are wrong Dave.

Agreed - the boat will start to acquire righting moment as soon as any of
the water ballast is higher than the surface - and there won't be very much
righting moment if only a little of the ballast is above the surface,
improving as the boat heels. IOW, the amount of righting moment varies,
depending on the amount of heel and just how the ballast is arranged within
the hull.

Yer just getting pedantic - yer know what I mean/meant.

(Yes, if *any* water in the ballast is above the waterline, it will
provide righting moment - pedantic chit aside - if this *ISN'T* the
case, is there any righting moment?)

--
Duncan
[Farr 7500 'Hi-Time' http://hitime.no-ip.info]

Dave Doe wrote:

Yer just getting pedantic - yer know what I mean/meant.

Nope. How do I know if you understand the physics involved, other than by
assessing what you write?


(Yes, if *any* water in the ballast is above the waterline, it will
provide righting moment - pedantic chit aside - if this *ISN'T* the
case, is there any righting moment?)

I guess there could be as a result of increasing bouancy - if the water
ballast at rest is below the surface, then a certain amount of heel might be
such that the ballast stays below the surface, but, depending on hull shape,
heeling might tend to increase the amount of air below the surface, with an
effect not unlike the righting moment induced by a counterbalancing weight.


--
Capt Scumbalino

In article ,
says...

"Dave Doe" wrote in
.
Indeed the water ballasting *only* has positive righting moment
if the
boat is pushed over to where the centerline is above the
waterline (a
fair way!).




Bzzzzzzt! You are wrong Dave.

Nice evidence.

PS: if yer don't believe me, fill a milk carton with water and
play with
it in the bath


A scientific study if ever there was one.

It sure *is*.

--
Duncan
[Farr 7500 'Hi-Time' http://hitime.no-ip.info]

"Dave Doe" wrote in message
.
Indeed the water ballasting *only* has positive righting
moment
if the
boat is pushed over to where the centerline is above the
waterline (a
fair way!).


Bzzzzzzt! You are wrong Dave.

Nice evidence.

This is ASA, no evidence necassary.




PS: if yer don't believe me, fill a milk carton with water
and
play with
it in the bath


A scientific study if ever there was one.

It sure *is*.


Take a 5 gallon jerry jug, put 5 gallons of water in it. Will it
float? Take that same 5 g. jug and put the same weight ( approx.
40 lbs.) in of lead. Will it float? Which floats higher?
Conclude which is heavier? Make sure you wash behind your ears.

Scotty

In article ,
says...

"Dave Doe" wrote in message
.
Indeed the water ballasting *only* has positive righting
moment
if the
boat is pushed over to where the centerline is above the
waterline (a
fair way!).


Bzzzzzzt! You are wrong Dave.

Nice evidence.

This is ASA, no evidence necassary.




PS: if yer don't believe me, fill a milk carton with water
and
play with
it in the bath


A scientific study if ever there was one.

It sure *is*.


Take a 5 gallon jerry jug, put 5 gallons of water in it. Will it
float? Take that same 5 g. jug and put the same weight ( approx.
40 lbs.) in of lead. Will it float? Which floats higher?
Conclude which is heavier? Make sure you wash behind your ears.

Scotty

Can you sink a 'positive buoyancy' boat with water? Can you sink it with
lead? You've proven my own point.

--
Duncan

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.

--
Duncan

"Dave Doe" wrote in message
. nz...
In article ,
says...

"Dave Doe" wrote in message
. nz...

Can you sink a 'positive buoyancy' boat with water? Can you
sink it with
lead? You've proven my own point.



What do submarines fill their ballast tanks with?

positive bouyancy boat submarine - EVER.


Bzzzt...Oh, I'm sorry, the correct answer is ''WATER'' .

Thanks for playing.

SBV