Actively variable deadrise
 

Actively variable deadrise
 

It seems that deadrise has a radical effect on the ability of a boat
to get on plane quickly and thus use less fuel. More deadrise makes a
boat punch through waves better but increases draft and reduces fuel
economy in smaller seas. I assume that variable deadrise has been
tried. Of course there are boats that try to use hull shape to
accomodate varying conditions but not too successfully.
My Tolman has about 10 degree deadrise and is very light so is very
fuel efficient but pounds a lot in chop so I have to slow down to
about 12 kts. Why not some mechanism that would consist of another
outer variable hull layer that would be hinged at the chines allowing
the keel portion to move downward to increase deadrise. It would have
a flexible stiff plastic piece at the front to keep water out of the
area between the two hulls. Is this simply too complex for too little
benefit?

Actively variable deadrise
 

Frogwatch wrote:
It seems that deadrise has a radical effect on the ability of a boat
to get on plane quickly and thus use less fuel. More deadrise makes a
boat punch through waves better but increases draft and reduces fuel
economy in smaller seas. I assume that variable deadrise has been
tried. Of course there are boats that try to use hull shape to
accomodate varying conditions but not too successfully.
My Tolman has about 10 degree deadrise and is very light so is very
fuel efficient but pounds a lot in chop so I have to slow down to
about 12 kts. Why not some mechanism that would consist of another
outer variable hull layer that would be hinged at the chines allowing
the keel portion to move downward to increase deadrise. It would have
a flexible stiff plastic piece at the front to keep water out of the
area between the two hulls. Is this simply too complex for too little
benefit?

Hehehehe. You *are* quite the poster.

Yes, there are plenty of "variable deadrise" hulls around, but not
because of hinges.

If we are talking small monohull planing hulls, there are flat bottom
boats that pound at speed, boats with deadrise like yours that plane
nicely in a light chop, mod-vee hulls that do a bit better than yours in
more chop, and deep vee hulls. There also are hulls with rounded chines
that do a bit better than yours.

A hinged bottom? Hey...design and build one, and get back to us.




--
The morality police - the bloviating gas bags of the religious right -
have fallen lower than the stock market. It has truly been an amazing
(and amusing) thing to watch these so-called "spokesmen of Christ"
defending their morally indefensible positions these days. Finally -
they're going away. It seems an answer to a prayer. Thank you, Lord.

Actively variable deadrise
 

On Thu, 19 Mar 2009 15:14:35 -0500, wrote:

On Thu, 19 Mar 2009 15:46:12 -0400, HK wrote:

Frogwatch wrote:
It seems that deadrise has a radical effect on the ability of a boat
to get on plane quickly and thus use less fuel. More deadrise makes a
boat punch through waves better but increases draft and reduces fuel
economy in smaller seas. I assume that variable deadrise has been
tried.
Hehehehe. You *are* quite the poster.


Hey it's a boating post.
All good ideas are proceeded by lots of bad ones.
WD-40 followed 39 failed attempts.

Not bad when you consider it took Edward G. Robinson 606 tries before
he arrived at the "magic bullet" cure for syphilis.
Killed a lot of people doing it too.
Just like WD-40 is still killing bearings.

--Vic

Actively variable deadrise
 

"Vic Smith" wrote in message
...

Not bad when you consider it took Edward G. Robinson 606 tries before
he arrived at the "magic bullet" cure for syphilis.
Killed a lot of people doing it too.
Just like WD-40 is still killing bearings.

--Vic


So it's not a good idea for JohnnyPrepH to lubricate/winterize his outboards
cylinders with WD-40?

Actively variable deadrise
 

On Thu, 19 Mar 2009 14:44:06 -0800, "Calif Bill"
wrote:



Active Variable deadrise. Actually an interesting concept. I know fighter
places have variable wing surfaces, etc. Maybe an inflatable sponson for a
tunnel on the sides, etc. At least it is a boating content thread. But
since you are imagination restricted, would be hard for you to accept this
as an interesting concept.

Here ya go.

http://www.freepatentsonline.com/6158376.html

--Vic

Actively variable deadrise
 

Calif Bill wrote:
"HK" wrote in message
m...
Frogwatch wrote:
It seems that deadrise has a radical effect on the ability of a boat
to get on plane quickly and thus use less fuel. More deadrise makes a
boat punch through waves better but increases draft and reduces fuel
economy in smaller seas. I assume that variable deadrise has been
tried. Of course there are boats that try to use hull shape to
accomodate varying conditions but not too successfully.
My Tolman has about 10 degree deadrise and is very light so is very
fuel efficient but pounds a lot in chop so I have to slow down to
about 12 kts. Why not some mechanism that would consist of another
outer variable hull layer that would be hinged at the chines allowing
the keel portion to move downward to increase deadrise. It would have
a flexible stiff plastic piece at the front to keep water out of the
area between the two hulls. Is this simply too complex for too little
benefit?
Hehehehe. You *are* quite the poster.

Yes, there are plenty of "variable deadrise" hulls around, but not because
of hinges.

If we are talking small monohull planing hulls, there are flat bottom
boats that pound at speed, boats with deadrise like yours that plane
nicely in a light chop, mod-vee hulls that do a bit better than yours in
more chop, and deep vee hulls. There also are hulls with rounded chines
that do a bit better than yours.

A hinged bottom? Hey...design and build one, and get back to us.



Active Variable deadrise. Actually an interesting concept. I know fighter
places have variable wing surfaces, etc. Maybe an inflatable sponson for a
tunnel on the sides, etc. At least it is a boating content thread. But
since you are imagination restricted, would be hard for you to accept this
as an interesting concept.



I find travel faster than the speed of light an interesting concept, too.


--
The morality police - the bloviating gas bags of the religious right -
have fallen lower than the stock market. It has truly been an amazing
(and amusing) thing to watch these so-called "spokesmen of Christ"
defending their morally indefensible positions these days. Finally -
they're going away. It seems an answer to a prayer. Thank you, Lord.

Actively variable deadrise
 

"Vic Smith" wrote in message
...
On Thu, 19 Mar 2009 14:44:06 -0800, "Calif Bill"
wrote:



Active Variable deadrise. Actually an interesting concept. I know
fighter
places have variable wing surfaces, etc. Maybe an inflatable sponson for
a
tunnel on the sides, etc. At least it is a boating content thread. But
since you are imagination restricted, would be hard for you to accept this
as an interesting concept.

Here ya go.

http://www.freepatentsonline.com/6158376.html

--Vic


Regal has a hull design that basically touts a "variable" deadrise, based on
lift.
This was an interesting read:

http://www.ll.georgetown.edu/federal...s/99-1511.html


Eisboch

Actively variable deadrise
 

On Thu, 19 Mar 2009 18:07:15 -0400, "Eisboch"
wrote:




Regal has a hull design that basically touts a "variable" deadrise, based on
lift.
This was an interesting read:

http://www.ll.georgetown.edu/federal...s/99-1511.html


It takes a lawyer to claim that a shape hull shape can violate a
patent.
Every time my head creates a "new invention" I look on the internet
and see a vastly improved version already patented.
Once in a while when I forget to look on the internet, I see one of my
"inventions" already on sale at the store.

--Vic

Actively variable deadrise
 

"HK" wrote in message
m...
Frogwatch wrote:
It seems that deadrise has a radical effect on the ability of a boat
to get on plane quickly and thus use less fuel. More deadrise makes a
boat punch through waves better but increases draft and reduces fuel
economy in smaller seas. I assume that variable deadrise has been
tried. Of course there are boats that try to use hull shape to
accomodate varying conditions but not too successfully.
My Tolman has about 10 degree deadrise and is very light so is very
fuel efficient but pounds a lot in chop so I have to slow down to
about 12 kts. Why not some mechanism that would consist of another
outer variable hull layer that would be hinged at the chines allowing
the keel portion to move downward to increase deadrise. It would have
a flexible stiff plastic piece at the front to keep water out of the
area between the two hulls. Is this simply too complex for too little
benefit?

Hehehehe. You *are* quite the poster.

Yes, there are plenty of "variable deadrise" hulls around, but not because
of hinges.

If we are talking small monohull planing hulls, there are flat bottom
boats that pound at speed, boats with deadrise like yours that plane
nicely in a light chop, mod-vee hulls that do a bit better than yours in
more chop, and deep vee hulls. There also are hulls with rounded chines
that do a bit better than yours.

A hinged bottom? Hey...design and build one, and get back to us.



Active Variable deadrise. Actually an interesting concept. I know fighter
places have variable wing surfaces, etc. Maybe an inflatable sponson for a
tunnel on the sides, etc. At least it is a boating content thread. But
since you are imagination restricted, would be hard for you to accept this
as an interesting concept.