BTW 0.75 KW = 1HP 5KW = 6.6 HP

Bill
"yihang bmc-unsw" wrote in message
om...
Pete C wrote in message
. ..
On 9 Jul 2004 06:52:33 -0700, (yihang bmc-unsw)
wrote:

came across this last night

http://www.ozecodrive.com/english/index_e.html

comes with everything u need except batteries. claims that sailing for
20 mins at 6 knots will charge the batteries enough for 5 minutes of
power sail.

all about 4500 including folding prop.

i read through the archives but nothing as complete as this was ever
discussed.

has anyone actually used these in real life? they seem like a great
alternative.

Hi,

Looks like they are using a Lynch Motor:

http://www.lemcoltd.com

and a flex o fold prop:

http://www.flexofold.com/default.htm

There's also a good discussion of electric boat propulsion on the
Lemco site too:

http://www.lemcoltd.com/lmc_discussions.htm

The motor alone probably goes for around $1000 and the prop up to
$1500 tops.

It's also better to gear the prop down and if it's not a racing yacht
it might be a lot cheaper to have a fixed prop and let it free run
when not under power.

Also if you don't need so much power a 1.6Kw motor should be available
for $350.

cheers,
Pete.





hi


thanks for the feedback. I email the company about replacement
motors. i would actually prefer to just buy the system without the
motor and mount a brushless Etek myself. the old Eteks were only about
400 bucks each and the new ones are meant to have an output of 15hp
max and 8 hp continuous (these might be the equivalent of a diesela nd
not real figues), but i think the new motor is 5kw.

the other road might be to make the unit myself from parts. but im
having trottle finding the appropriate control units and recharge
units. Plus alot more research needs to be done. would be good if they
would sell me the control hardware seperately.



thanks

"Bill" wrote in message ...
BTW 0.75 KW = 1HP 5KW = 6.6 HP

Bill
"yihang bmc-unsw" wrote in message
om...
Pete C wrote in message
. ..
On 9 Jul 2004 06:52:33 -0700, (yihang bmc-unsw)
wrote:

came across this last night

http://www.ozecodrive.com/english/index_e.html

comes with everything u need except batteries. claims that sailing for
20 mins at 6 knots will charge the batteries enough for 5 minutes of
power sail.

all about 4500 including folding prop.

i read through the archives but nothing as complete as this was ever
discussed.

has anyone actually used these in real life? they seem like a great
alternative.

Hi,

Looks like they are using a Lynch Motor:

http://www.lemcoltd.com

and a flex o fold prop:

http://www.flexofold.com/default.htm

There's also a good discussion of electric boat propulsion on the
Lemco site too:

http://www.lemcoltd.com/lmc_discussions.htm

The motor alone probably goes for around $1000 and the prop up to
$1500 tops.

It's also better to gear the prop down and if it's not a racing yacht
it might be a lot cheaper to have a fixed prop and let it free run
when not under power.

Also if you don't need so much power a 1.6Kw motor should be available
for $350.

cheers,
Pete.





hi


thanks for the feedback. I email the company about replacement
motors. i would actually prefer to just buy the system without the
motor and mount a brushless Etek myself. the old Eteks were only about
400 bucks each and the new ones are meant to have an output of 15hp
max and 8 hp continuous (these might be the equivalent of a diesela nd
not real figues), but i think the new motor is 5kw.

the other road might be to make the unit myself from parts. but im
having trottle finding the appropriate control units and recharge
units. Plus alot more research needs to be done. would be good if they
would sell me the control hardware seperately.



thanks




yes. but electric engines are alot more efficient. i think the
actually torque output of a 5 hp electric motor is the equivalent of a
9hp diesel or more.

from people experience. a 6 kw motor at max rpm can produce something
approaching 15hp equivalent. its anecdotal though. but DIRECT driven
elec engines definately get more HP to the propeller

(yihang bmc-unsw) wrote in message om...
"Bill" wrote in message ...
BTW 0.75 KW = 1HP 5KW = 6.6 HP

Bill
"yihang bmc-unsw" wrote in message
om...
Pete C wrote in message
. ..
On 9 Jul 2004 06:52:33 -0700, (yihang bmc-unsw)
wrote:

came across this last night

http://www.ozecodrive.com/english/index_e.html

comes with everything u need except batteries. claims that sailing for
20 mins at 6 knots will charge the batteries enough for 5 minutes of
power sail.

all about 4500 including folding prop.

i read through the archives but nothing as complete as this was ever
discussed.

has anyone actually used these in real life? they seem like a great
alternative.

Hi,

Looks like they are using a Lynch Motor:

http://www.lemcoltd.com

and a flex o fold prop:

http://www.flexofold.com/default.htm

There's also a good discussion of electric boat propulsion on the
Lemco site too:

http://www.lemcoltd.com/lmc_discussions.htm

The motor alone probably goes for around $1000 and the prop up to
$1500 tops.

It's also better to gear the prop down and if it's not a racing yacht
it might be a lot cheaper to have a fixed prop and let it free run
when not under power.

Also if you don't need so much power a 1.6Kw motor should be available
for $350.

cheers,
Pete.





hi


thanks for the feedback. I email the company about replacement
motors. i would actually prefer to just buy the system without the
motor and mount a brushless Etek myself. the old Eteks were only about
400 bucks each and the new ones are meant to have an output of 15hp
max and 8 hp continuous (these might be the equivalent of a diesela nd
not real figues), but i think the new motor is 5kw.

the other road might be to make the unit myself from parts. but im
having trottle finding the appropriate control units and recharge
units. Plus alot more research needs to be done. would be good if they
would sell me the control hardware seperately.



thanks




yes. but electric engines are alot more efficient. i think the
actually torque output of a 5 hp electric motor is the equivalent of a
9hp diesel or more.

from people experience. a 6 kw motor at max rpm can produce something
approaching 15hp equivalent. its anecdotal though. but DIRECT driven
elec engines definately get more HP to the propeller

I remember in "Run Silent, Run Deep", the sub motor could run with
batteries in either serial or parallel, not sure why. Serial would
give lots of Volts perhaps for lots of power whereas parallel would be
for extended cruise at low power. Could such a system be used here?

Parallax wrote:

I remember in "Run Silent, Run Deep", the sub motor could run with
batteries in either serial or parallel, not sure why. Serial would
give lots of Volts perhaps for lots of power whereas parallel would be
for extended cruise at low power. Could such a system be used here?

Why? The speed of these electric motors is dependant on the voltage (RPMperV). Serial =high speed, parallel =1/2
speed at twice battery capacity.
I can't see why such a system could not be used on an electric boat.

someone suggested to me that if i were to use the propeller to
regenrate power. i would have to have the system in parallel so under
charging mode, diodes could be used to step down the 48v system to a
12 v. because the batteries only start to charge after the generator
has earched the capacity of the batteries.

so to charge a 48 volt system, the propeller would have to spin 4
times as fast to charge the batteries than if its a 12v

i probably didnt explain it very well. but basically dont buy into the
promise of regenration .

On 14 Jul 2004 00:59:03 -0700, (yihang bmc-unsw)
wrote:

someone suggested to me that if i were to use the propeller to
regenrate power. i would have to have the system in parallel so under
charging mode, diodes could be used to step down the 48v system to a
12 v. because the batteries only start to charge after the generator
has earched the capacity of the batteries.

so to charge a 48 volt system, the propeller would have to spin 4
times as fast to charge the batteries than if its a 12v

i probably didnt explain it very well. but basically dont buy into the
promise of regenration .

Hi,

Might be possible to get a 'linear current booster' or DC to DC
converter to convert the generated ~12v to a suitable 48+V for
charging.

cheers,
Pete.

Check out http://www.solomontechnologies.com/

They do buy into regeneration and have it working


"yihang bmc-unsw" wrote in message
om...
someone suggested to me that if i were to use the propeller to
regenrate power. i would have to have the system in parallel so under
charging mode, diodes could be used to step down the 48v system to a
12 v. because the batteries only start to charge after the generator
has earched the capacity of the batteries.

so to charge a 48 volt system, the propeller would have to spin 4
times as fast to charge the batteries than if its a 12v

i probably didnt explain it very well. but basically dont buy into the
promise of regenration .