I have terrible performance in reverse. I have the 27 horse Yanmar 3GM
and I am considering a max prop. Is there anyone with experience with
a max prop on the BCC? What size is appropriate?
Charles Smith
SADIE #104
Sandusky Harbor Marina, Sandusky, OH
RE: Maxprop–I ahve just installed a Maxprop three blade and have the same
engine on my BCC. I forget what the size was–You may contact Post Road
Boat Yard at 914 698 0295 and ask for Pete, who installed it. The setting
for the pitch is 22 degrees–I am not sure what this equates to in pitch.
If you have any other questions, call me at 914 895-2033
Mark Giegel.
ps I had a Maxprop three blade on my 38’ LeComte, which was a full keel with
the prop in an aperture similar to BCC and reverse was excellent
-----Original Message-----
From: Charles Smith <falcon@erinet.com >
To: bcc@eGroups.com <bcc@eGroups.com >
Date: Monday, March 06, 2000 8:54 PM
Subject: [bcc] Max Prop
I have terrible performance in reverse. I have the 27 horse Yanmar 3GM
and I am considering a max prop. Is there anyone with experience with
a max prop on the BCC? What size is appropriate?Charles Smith
SADIE #104
Sandusky Harbor Marina, Sandusky, OH
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Thanks so much, Mark. Exactly the information I was looking for!
Charles Smith
SADIE #104
|
I am thinking about putting a Max-Prop on BCC, I have the 3GM30F engine.
Is anyone out there with the same engine using the Max-Prop and if so what are the
specifications for the prop you are using.
I would also be interested in hearing from anyone who is using a 3 bladed prop with this
engine in a BCC.
I currently have the 15 inch 2 blade prop.
Steven Osborne
Crystal Swan II
Port Isabel, TX
|
Steven,
We have a 16" Max-Prop on Galatea, and just went through the process
of correcting the pitch. (I’m constantly reminded of what Lin Pardey
said about ‘doing product research for marine manufacturers’). PYI
initially told us to set the pitch to 22 degrees. Our 3GM30F would
max at about 2700 RPM at this setting. So we consulted PYI with this
information, and they scratched their heads and said that didn’t make
sense, but that decreasing the pitch by 4 degrees (two settings
difference) should get us to the recommended 3600 RPM. So we did
that, and only got to 3300 rpm. So we hauled again, went one more
click, and finally got the recommended max RPM.
(I did share my “research” with PYI, though they declined to pick up
the costs. They did send me some extra zincs and a servicing kit,
which was nice. Pay attention to the space you need in the aperture
to see if you can even fit a shaft zinc; we didn’t have enough room,
so I’m being real careful about monitoring the prop zincs.)
So, set your Max-prop at 16 degrees and you should be okay. Of
course, “your mileage may vary” (slightly), as we’re loaded for
cruising.
Tom Unruh
Galatea
#117
Tom,
Thank you for the insights. Your information should save me a lot of
headaches later on.
How do you like the prop now that you have to pitch set correctly? How well
does it work in reverse? Has your fuel consumption changed any?
Thank you again for you feedback.
Steven Osborne
steven.j.osborne@worldnet.att.net
----- Original Message -----
From: <jlwtau@hotmail.com >
To: <bcc@yahoogroups.com >
Sent: Monday, September 10, 2001 9:19 AM
Subject: [bcc] Re: Max Prop
Steven,
We have a 16" Max-Prop on Galatea, and just went through the process
of correcting the pitch. (I’m constantly reminded of what Lin Pardey
said about ‘doing product research for marine manufacturers’). PYI
initially told us to set the pitch to 22 degrees. Our 3GM30F would
max at about 2700 RPM at this setting. So we consulted PYI with this
information, and they scratched their heads and said that didn’t make
sense, but that decreasing the pitch by 4 degrees (two settings
difference) should get us to the recommended 3600 RPM. So we did
that, and only got to 3300 rpm. So we hauled again, went one more
click, and finally got the recommended max RPM.(I did share my “research” with PYI, though they declined to pick up
the costs. They did send me some extra zincs and a servicing kit,
which was nice. Pay attention to the space you need in the aperture
to see if you can even fit a shaft zinc; we didn’t have enough room,
so I’m being real careful about monitoring the prop zincs.)So, set your Max-prop at 16 degrees and you should be okay. Of
course, “your mileage may vary” (slightly), as we’re loaded for
cruising.Tom Unruh
Galatea
#117BRISTOL CHANNEL CUTTER OWNERS ASSOCIATION
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Dear Tom,
Please give us more info on the effect of the Max-Prop. Is the backing
improved ? Are you able to back in either direction ?
How about boat speed etc…
Jim Hiller
jlwtau@hotmail.com wrote:
Steven,
We have a 16" Max-Prop on Galatea, and just went through the process
of correcting the pitch. (I’m constantly reminded of what Lin Pardey
said about ‘doing product research for marine manufacturers’). PYI
initially told us to set the pitch to 22 degrees. Our 3GM30F would
max at about 2700 RPM at this setting. So we consulted PYI with this
information, and they scratched their heads and said that didn’t make
sense, but that decreasing the pitch by 4 degrees (two settings
difference) should get us to the recommended 3600 RPM. So we did
that, and only got to 3300 rpm. So we hauled again, went one more
click, and finally got the recommended max RPM.(I did share my “research” with PYI, though they declined to pick up
the costs. They did send me some extra zincs and a servicing kit,
which was nice. Pay attention to the space you need in the aperture
to see if you can even fit a shaft zinc; we didn’t have enough room,
so I’m being real careful about monitoring the prop zincs.)So, set your Max-prop at 16 degrees and you should be okay. Of
course, “your mileage may vary” (slightly), as we’re loaded for
cruising.Tom Unruh
Galatea
#117BRISTOL CHANNEL CUTTER OWNERS ASSOCIATION
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mine is a 16" diameter, 1" shaft which is a 63mm hub.
john
Jim,
The boat backs quite well, though it will never back like a boat with
a fin keel/spade rudder. But response is powerful and positive. We
can back in either direction, with a little way on. Of course, we
have been beaten by adverse currents in some situations. Our flat
water top speed was about 7 knots, which may reflect a slight
calibration error in our knotmeter. Six knots seems a reasonable
cruising speed, at about 2900-3000 rpm.
While we haven’t refueled much yet and don’t have a lot of fuel
consumption data, I did see a difference after we readjusted the
prop. Our first tank (with the more aggressive setting) showed about
0.4 gph, and the second showed closer to 0.5 gph. This would be
consistent with higher rpm operation, and higher boat speed as well.
Tom
— In bcc@y…, james hiller <jhiller@a…> wrote:
Dear Tom,
Please give us more info on the effect of the Max-Prop. Is the
backing
improved ? Are you able to back in either direction ?
How about boat speed etc…
Jim Hiller
Jim,
We started with a Max-prop, so we can’t really talk
about “improvement.” But the response in reverse is powerful and
positive. The boat will never back like a boat with fin keel/spade
rudder, but we can maneuver confidently.
Boat speed is good. Our flat water top speed is about 7 knots, which
may reflect a bit of knotmeter calibration error. Cruising speed of 6
knots requires about 2900-3000 rpm, which is where Yanmar techs say
it should be.
We don’t have much fuel consumption data yet, but I noticed a
significant difference between the first and second tank which
reflects the change in RPM and boat speed under power. The first was
about 0.4 gph, and the second was closer to 0.5 gph.
Tom U.
Galatea, #117
— In bcc@y…, james hiller <jhiller@a…> wrote:
Dear Tom,
Please give us more info on the effect of the Max-Prop. Is the
backing
improved ? Are you able to back in either direction ?
How about boat speed etc…
Jim Hiller
Thanks Tom .
My big boat ( a Valiant 50) has an Autoprop. Questionable if any improvement
in reverse. Boat still refuses to back to port even if you had the entire
ocean to make way. I ended up putting thrusters in.,but it displaces over
50,000 lbs wet. I am especially curious about whether the BCC can be backed
in either direction.
Did you equip your boat with an autopilot?
I am leaning toward using an autopilot instead of a vane because of the
effect on the helm during day sailing. I’ll increase battery capacity to
allow greater use.
What are your thoughts?
Are you in Annapolis? I’m going to be there for the show working for
Valiant. If you do I’d enjoy meeting you
Regards,
Jim
----- Original Message -----
From: <jlwtau@hotmail.com >
To: <bcc@yahoogroups.com >
Sent: Friday, September 14, 2001 11:03 AM
Subject: [bcc] Re: Max Prop
Jim,
We started with a Max-prop, so we can’t really talk
about “improvement.” But the response in reverse is powerful and
positive. The boat will never back like a boat with fin keel/spade
rudder, but we can maneuver confidently.Boat speed is good. Our flat water top speed is about 7 knots, which
may reflect a bit of knotmeter calibration error. Cruising speed of 6
knots requires about 2900-3000 rpm, which is where Yanmar techs say
it should be.We don’t have much fuel consumption data yet, but I noticed a
significant difference between the first and second tank which
reflects the change in RPM and boat speed under power. The first was
about 0.4 gph, and the second was closer to 0.5 gph.Tom U.
Galatea, #117— In bcc@y…, james hiller <jhiller@a…> wrote:
Dear Tom,
Please give us more info on the effect of the Max-Prop. Is the
backing
improved ? Are you able to back in either direction ?
How about boat speed etc…
Jim HillerBRISTOL CHANNEL CUTTER OWNERS ASSOCIATION
Mail List Home: http://groups.yahoo.com/group/bcc
BCC Owners Home: http://www.geocities.com/bccowners
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Jim,
We had an Autoprop on our last boat, a Tartan 31. Frankly, I was
disappointed in its response in reverse as well, though the boat was
quite maneuverable. The Autoprop seemingly develops its bite at
higher prop speeds. The Maxprop in comparison seems to us much more
positive.
Our BCC can be backed, though it obviously prefers the other
direction. The big unbalanced rudder helps a lot once you get even a
small amount of way on, though you must keep a careful hand on it so
it doesn’t get away from you.
Re the autopilot, we’re using a Freehand vane which uses a trim tab,
and have mounted a Navico Tillerpilot (the smallest model) to steer
the trim tab. This draws very little energy, and we mostly use it
for motoring anyway. The vane works great under sail, and is an
elegant solution for the unique configuration of the BCC rig, i.e.
boomkin and outboard rudder. Also, redundancy for the tillerpilot is
(relatively) cheap and about as simple as it gets.
Good luck at the show. This will be the first Annapolis show we’ll
miss in about 10 years, but we’re in Colorado making our way back to
Ensenada.
Fair winds,
Tom U.
Galatea, #117
— In bcc@y…, “James Hiller” <jhiller@a…> wrote:
Thanks Tom .
My big boat ( a Valiant 50) has an Autoprop. Questionable if any
improvement
in reverse. Boat still refuses to back to port even if you had the
entire
ocean to make way. I ended up putting thrusters in.,but it
displaces over
50,000 lbs wet. I am especially curious about whether the BCC can
be backed
in either direction.
Did you equip your boat with an autopilot?
I am leaning toward using an autopilot instead of a vane because of
the
effect on the helm during day sailing. I’ll increase battery
capacity to
allow greater use.
What are your thoughts?
Are you in Annapolis? I’m going to be there for the show working for
Valiant. If you do I’d enjoy meeting you
Regards,
Jim
Thanks for your thoughtful and erudite reply.
Does the Freehand vane induce any unwanted weather helm ?
I have been concerned that adding additional area aft of the rudder would
induce a woeful amount of weather helm that would result in sailing the
boat with a constant reef in the main.
Thanks again,
Jim
----- Original Message -----
From: <jlwtau@hotmail.com >
To: <bcc@yahoogroups.com >
Sent: Saturday, September 15, 2001 12:29 PM
Subject: [bcc] Re: Max Prop
Jim,
We had an Autoprop on our last boat, a Tartan 31. Frankly, I was
disappointed in its response in reverse as well, though the boat was
quite maneuverable. The Autoprop seemingly develops its bite at
higher prop speeds. The Maxprop in comparison seems to us much more
positive.Our BCC can be backed, though it obviously prefers the other
direction. The big unbalanced rudder helps a lot once you get even a
small amount of way on, though you must keep a careful hand on it so
it doesn’t get away from you.Re the autopilot, we’re using a Freehand vane which uses a trim tab,
and have mounted a Navico Tillerpilot (the smallest model) to steer
the trim tab. This draws very little energy, and we mostly use it
for motoring anyway. The vane works great under sail, and is an
elegant solution for the unique configuration of the BCC rig, i.e.
boomkin and outboard rudder. Also, redundancy for the tillerpilot is
(relatively) cheap and about as simple as it gets.Good luck at the show. This will be the first Annapolis show we’ll
miss in about 10 years, but we’re in Colorado making our way back to
Ensenada.Fair winds,
Tom U.
Galatea, #117— In bcc@y…, “James Hiller” <jhiller@a…> wrote:
Thanks Tom .
My big boat ( a Valiant 50) has an Autoprop. Questionable if any
improvement
in reverse. Boat still refuses to back to port even if you had the
entire
ocean to make way. I ended up putting thrusters in.,but it
displaces over
50,000 lbs wet. I am especially curious about whether the BCC can
be backed
in either direction.
Did you equip your boat with an autopilot?
I am leaning toward using an autopilot instead of a vane because of
the
effect on the helm during day sailing. I’ll increase battery
capacity to
allow greater use.
What are your thoughts?
Are you in Annapolis? I’m going to be there for the show working for
Valiant. If you do I’d enjoy meeting you
Regards,
JimBRISTOL CHANNEL CUTTER OWNERS ASSOCIATION
Mail List Home: http://groups.yahoo.com/group/bcc
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We haven’t noticed an undue amount of weather helm under sail. If the
trim tab were locked in position, it would (and does) increase the
helm, but we always unlock it when sailing.
It’s very important to balance the sails to reduce the amount of
weather helm when using the vane. Sometimes this requires a reef
earlier than one might think, but it doesn’t seem to affect boat
speed much.
Tom U.
Galatea
#117
— In bcc@y…, “James Hiller” <jhiller@a…> wrote:
Thanks for your thoughtful and erudite reply.
Does the Freehand vane induce any unwanted weather helm ?
I have been concerned that adding additional area aft of the rudder
would
induce a woeful amount of weather helm that would result in
sailing the
boat with a constant reef in the main.
Thanks again,
Jim
I’ve heard nothing but good things about the autoprop as well. I think
it’s a bit less expensive than the maxprop. Their webaddress is
http://www.autoprop.com. I don’t have one personally though but I’m
considering it.
-Todd
— In bcc@y…, “Steven Osborne” <steven.j.osborne@w…> wrote:
I am thinking about putting a Max-Prop on BCC, I have the 3GM30F
engine.Is anyone out there with the same engine using the Max-Prop and if
so what are the
specifications for the prop you are using.
I would also be interested in hearing from anyone who is using a 3
bladed prop with this
engine in a BCC.
I currently have the 15 inch 2 blade prop.Steven Osborne
Crystal Swan II
Port Isabel, TXsteven.j.osborne@w…
Isn’t the problem with the Autoprop that it won’t fit in the aperture?
I do have one on another boat. It has not met my expectations but it is
reliable and has a lot less drag than a fixed prop.
Jim Hiller
----- Original Message -----
From: <thuss@iname.com >
To: <bcc@yahoogroups.com >
Sent: Wednesday, October 10, 2001 1:07 PM
Subject: [bcc] Re: Max Prop
I’ve heard nothing but good things about the autoprop as well. I think
it’s a bit less expensive than the maxprop. Their webaddress is
http://www.autoprop.com. I don’t have one personally though but I’m
considering it.-Todd
— In bcc@y…, “Steven Osborne” <steven.j.osborne@w…> wrote:
I am thinking about putting a Max-Prop on BCC, I have the 3GM30F
engine.Is anyone out there with the same engine using the Max-Prop and if
so what are the
specifications for the prop you are using.
I would also be interested in hearing from anyone who is using a 3
bladed prop with this
engine in a BCC.
I currently have the 15 inch 2 blade prop.Steven Osborne
Crystal Swan II
Port Isabel, TXsteven.j.osborne@w…
BRISTOL CHANNEL CUTTER OWNERS ASSOCIATION
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