I have been wondering if a displacement hull that moves fast enough
would create a sort of "sonic boom" just as an object moving fast
enough in air does. In air, the shock is created when the aircraft
moves too fast for the air to get out of the way. In water, a
displacement hull attempts to climb its bow wave which effectively
limits its speed. Apparently, this hull speed is not a mathematical
limit but merely a practical limit as sufficient power can move a hull
over hull speed. However the power necessary to produce any further
increase in speed radically increases above hull speed. If you did
manage to produce enough power, could you power through the bow wave
and thus produce a shock wave?

wrote in message
ups.com...


In air, the shock is created when the aircraft
moves too fast for the air to get out of the way.

Are you sure of this definition?


Eisboch

No

wrote in message
oups.com...
No


Me either.

Eisboch

"If you did manage to produce enough power, could you power through the
bow wave
and thus produce a shock wave?"

If you did, you would be on plane, traveling over the water for the most
part, and leaving any remnant of a bow wave behind the boat. Any relation
of this phenomena to a sonic or acoustical shock wave is only academic,
since the speed of sound in water is about 5 times faster than air, so it
isn't likely that there will ever be a watercraft moving at 3500mph.

"Floyd" wrote in message
...
"If you did manage to produce enough power, could you power through the
bow wave
and thus produce a shock wave?"

If you did, you would be on plane, traveling over the water for the most
part, and leaving any remnant of a bow wave behind the boat. Any relation
of this phenomena to a sonic or acoustical shock wave is only academic,
since the speed of sound in water is about 5 times faster than air, so it
isn't likely that there will ever be a watercraft moving at 3500mph.




I believe Skipper claimed his Bayliner came close to that speed at WOT once
while on the Sea of Cortez trying to outrun a giant Tostito. ;-)

JimH wrote:
I believe Skipper claimed his Bayliner came close to that speed at WOT once
while on the Sea of Cortez trying to outrun a giant Tostito. ;-)



tostito as in a giant corn based chip? how is that possible? was it
carrying any added dip or guacamole?

"DownTime" wrote in message
.. .
JimH wrote:
I believe Skipper claimed his Bayliner came close to that speed at WOT
once while on the Sea of Cortez trying to outrun a giant Tostito. ;-)

tostito as in a giant corn based chip? how is that possible? was it
carrying any added dip or guacamole?


Yes........in 55 gallon drums strapped onto the deck.

JimH wrote:
"Floyd" wrote in message
...

"If you did manage to produce enough power, could you power through the
bow wave
and thus produce a shock wave?"

If you did, you would be on plane, traveling over the water for the most
part, and leaving any remnant of a bow wave behind the boat. Any relation
of this phenomena to a sonic or acoustical shock wave is only academic,
since the speed of sound in water is about 5 times faster than air, so it
isn't likely that there will ever be a watercraft moving at 3500mph.





I believe Skipper claimed his Bayliner came close to that speed at WOT once
while on the Sea of Cortez trying to outrun a giant Tostito. ;-)



Skipper *is* a giant Tostito!

My impression is that a planing hull has no relation to hull speed.
Furthermore, we are not talking about the speed of compressional waves
as in sound but the much slower surface waves.