I'm in the process of building an e-boat and am looking for a ~19 inch
variable pitch prop along with probably the shaft and any controls that may
be associated with it.

A friend of mine told me that Volvo makes one, but none of their dealers
seem to know anything about it.

I have been told by others that older fishing boats used to use these, but
were unable to supply a manufacturer name.

If anyone knows of a source, it would be greatly appreciated.

"Bill Farina" wrote in message
...
I'm in the process of building an e-boat and am looking for a ~19 inch
variable pitch prop along with probably the shaft and any controls that
may
be associated with it.

A friend of mine told me that Volvo makes one, but none of their dealers
seem to know anything about it.

I have been told by others that older fishing boats used to use these, but
were unable to supply a manufacturer name.

If anyone knows of a source, it would be greatly appreciated.

Luke, Maxprop, Autoprop, Martec make feathering props with adjustable
pitches. They give you a recommended pitch, you make any necessary
adjustments. Pricey, very pricey in the case of the Luke, which are
one-offs.

http://www.peluke.com/Propellers/propellers.html

http://tinylink.com/?pbh5yrcpXO

Was that what you were referring to?

John Cairns

"John Cairns" wrote in message
...

"Bill Farina" wrote in message
...
I'm in the process of building an e-boat and am looking for a ~19 inch
variable pitch prop along with probably the shaft and any controls that
may
be associated with it.

A friend of mine told me that Volvo makes one, but none of their dealers
seem to know anything about it.

I have been told by others that older fishing boats used to use these,
but were unable to supply a manufacturer name.

If anyone knows of a source, it would be greatly appreciated.

Luke, Maxprop, Autoprop, Martec make feathering props with adjustable
pitches. They give you a recommended pitch, you make any necessary
adjustments. Pricey, very pricey in the case of the Luke, which are
one-offs.

http://www.peluke.com/Propellers/propellers.html

http://tinylink.com/?pbh5yrcpXO

Was that what you were referring to?

Exactly, thanks.

Now I just have to begin saving my pennys. :-)


John Cairns

"Bill Farina" wrote in message
...

"John Cairns" wrote in message
...

"Bill Farina" wrote in message
...
I'm in the process of building an e-boat and am looking for a ~19 inch
variable pitch prop along with probably the shaft and any controls that
may
be associated with it.

A friend of mine told me that Volvo makes one, but none of their dealers
seem to know anything about it.

I have been told by others that older fishing boats used to use these,
but were unable to supply a manufacturer name.

If anyone knows of a source, it would be greatly appreciated.

Luke, Maxprop, Autoprop, Martec make feathering props with adjustable
pitches. They give you a recommended pitch, you make any necessary
adjustments. Pricey, very pricey in the case of the Luke, which are
one-offs.

http://www.peluke.com/Propellers/propellers.html

http://tinylink.com/?pbh5yrcpXO

Was that what you were referring to?

Exactly, thanks.

Now I just have to begin saving my pennys. :-)

You never mentioned why you wanted a feathering prop. Have you considered a
folding prop? Folders work better under sail than feathering
props-considerably less drag than feathering props-and even the best, like
Gori, run about half the cost of a feathering prop.

http://tinylink.com/?khyWB1cXEC

I have a Gori two blade standard folder, sweet.

John Cairns

"John Cairns" wrote in message
. ..

"Bill Farina" wrote in message
...

"John Cairns" wrote in message
...

"Bill Farina" wrote in message
...
I'm in the process of building an e-boat and am looking for a ~19 inch
variable pitch prop along with probably the shaft and any controls that
may
be associated with it.

A friend of mine told me that Volvo makes one, but none of their
dealers
seem to know anything about it.

I have been told by others that older fishing boats used to use these,
but were unable to supply a manufacturer name.

If anyone knows of a source, it would be greatly appreciated.

Luke, Maxprop, Autoprop, Martec make feathering props with adjustable
pitches. They give you a recommended pitch, you make any necessary
adjustments. Pricey, very pricey in the case of the Luke, which are
one-offs.

http://www.peluke.com/Propellers/propellers.html

http://tinylink.com/?pbh5yrcpXO

Was that what you were referring to?

Exactly, thanks.

Now I just have to begin saving my pennys. :-)

You never mentioned why you wanted a feathering prop. Have you considered
a folding prop? Folders work better under sail than feathering
props-considerably less drag than feathering props-and even the best, like
Gori, run about half the cost of a feathering prop.

http://tinylink.com/?khyWB1cXEC

I have a Gori two blade standard folder, sweet.

John Cairns

I'm in the process of converting a 38' full keel Seafarer ketch from diesel
to electric. I have 2 electric etek motors that I'm going to hook up inline
via a belt drive to the prop shaft. The working hp of the two motors is
kind of vague and I'll probably be running on just one motor most of the
time. Depending on the configuration, the working hp equivalency can be as
much as 2-6 times the electrical hp (which is 8 (15 in short bursts) per
etek). I want to have the flexability so that I can tweak the prop to
optimum efficiency.

"Bill Farina" wrote in message
...

"John Cairns" wrote in message
. ..

"Bill Farina" wrote in message
...

"John Cairns" wrote in message
...

"Bill Farina" wrote in message
...
I'm in the process of building an e-boat and am looking for a ~19 inch
variable pitch prop along with probably the shaft and any controls
that may
be associated with it.

A friend of mine told me that Volvo makes one, but none of their
dealers
seem to know anything about it.

I have been told by others that older fishing boats used to use these,
but were unable to supply a manufacturer name.

If anyone knows of a source, it would be greatly appreciated.

Luke, Maxprop, Autoprop, Martec make feathering props with adjustable
pitches. They give you a recommended pitch, you make any necessary
adjustments. Pricey, very pricey in the case of the Luke, which are
one-offs.

http://www.peluke.com/Propellers/propellers.html

http://tinylink.com/?pbh5yrcpXO

Was that what you were referring to?

Exactly, thanks.

Now I just have to begin saving my pennys. :-)

You never mentioned why you wanted a feathering prop. Have you considered
a folding prop? Folders work better under sail than feathering
props-considerably less drag than feathering props-and even the best,
like Gori, run about half the cost of a feathering prop.

http://tinylink.com/?khyWB1cXEC

I have a Gori two blade standard folder, sweet.

John Cairns

I'm in the process of converting a 38' full keel Seafarer ketch from
diesel to electric. I have 2 electric etek motors that I'm going to hook
up inline via a belt drive to the prop shaft. The working hp of the two
motors is kind of vague and I'll probably be running on just one motor
most of the time. Depending on the configuration, the working hp
equivalency can be as much as 2-6 times the electrical hp (which is 8 (15
in short bursts) per etek). I want to have the flexability so that I can
tweak the prop to optimum efficiency.

Then you are talking about an automatic variable pitch prop, I read a little
about it. Has to be $$$$$$$$$$$$$$.
For the time being, I'll stick wif me diesel

Link provided by Bart Senior:

http://www.helseth.no/eng_products_3h.htm

John Cairns

Bill,
I have been following the thread, and I believe that you might do some
thinking before you go too far....

Your ketch is probably about 15 ton. It will take both motors at flat
out to make hull speed with a more or less typical propellor efficiency.
Then there is the small matter or electric power. If you are not
planning to run it as a diesel-electric (like a Staten Island Ferry)
then you will need a huge battery collection (I am going to forego the
extension cord option).

If you run one 8hp (~6kw) motor with one 8D (230Ah) battery, the motor
will be pulling about 450amps (BIG wire) and at that load the battery
will be flat in about 15 minutes give or take.

As to the effective horsepower bit - bull....
Horsepower is horsepower and that is 746 watts. The only gain
experienced is from the constant instantaneous rotational speed that
electric provides. If you actually record the rotational speed of any
IC engine you will see significant variation that peaks at the fire
pulses. This is less pronounced with more cylinders and heavier
flywheels - of course.

If you were to compare an electric drive to a little diesel of three or
four cylinders with a heavy flywheel and a reduction gear drive, you
would be hard pressed to find a difference greater than you instrument
noise.

If you put out the capital for a CP wheel, what could you get for it?
Maybe another couple of minutes under power per charge. Reversing an
electric motor sure is no big problem.

There is another small problem. I have never found a CP wheel that
goes to full feather. I wanted one for a project of my own several
years ago and could find none. I wanted a marine engine with no
transmission at all, so I was hunting for a controllable/reversible
pitch propellor that could do all this. That seems to be the province
of aircraft.

In any case, I wish you the best of luck..
Keep us posted how it goes.

Matt Colie - see a prior sig


Bill Farina wrote:
"John Cairns" wrote in message
. ..

"Bill Farina" wrote in message
...

"John Cairns" wrote in message
. net...

"Bill Farina" wrote in message
...

I'm in the process of building an e-boat and am looking for a ~19 inch
variable pitch prop along with probably the shaft and any controls that
may
be associated with it.

A friend of mine told me that Volvo makes one, but none of their
dealers
seem to know anything about it.

I have been told by others that older fishing boats used to use these,
but were unable to supply a manufacturer name.

If anyone knows of a source, it would be greatly appreciated.

Luke, Maxprop, Autoprop, Martec make feathering props with adjustable
pitches. They give you a recommended pitch, you make any necessary
adjustments. Pricey, very pricey in the case of the Luke, which are
one-offs.

http://www.peluke.com/Propellers/propellers.html

http://tinylink.com/?pbh5yrcpXO

Was that what you were referring to?

Exactly, thanks.

Now I just have to begin saving my pennys. :-)

You never mentioned why you wanted a feathering prop. Have you considered
a folding prop? Folders work better under sail than feathering
props-considerably less drag than feathering props-and even the best, like
Gori, run about half the cost of a feathering prop.

http://tinylink.com/?khyWB1cXEC

I have a Gori two blade standard folder, sweet.

John Cairns


I'm in the process of converting a 38' full keel Seafarer ketch from diesel
to electric. I have 2 electric etek motors that I'm going to hook up inline
via a belt drive to the prop shaft. The working hp of the two motors is
kind of vague and I'll probably be running on just one motor most of the
time. Depending on the configuration, the working hp equivalency can be as
much as 2-6 times the electrical hp (which is 8 (15 in short bursts) per
etek). I want to have the flexability so that I can tweak the prop to
optimum efficiency.