I am still looking for a good feathering prop for my BCC. I have a
trusty 28 HP Volvo Penta ‘2003’ (made on 1988). My little fixed 2
blade prop does reasonably OK in forward…I am looking to upgrade
motoring speed (around 4.5-5 knots currently) and reduce fuel use
and sailing drag.
Does any one here actually use a 3 blade PYI Max-Prop? That is my
top choice right now…
Does anyone think that there is no useful reduction in drag from a
fixed 2 blade to a feathering 3 blade?
Thanks,
Julian
BCC #86 “Patience”
ps: I already know that using sails best reduces fuel use =)
I am still looking for a good feathering prop for my BCC. I have a
trusty 28 HP Volvo Penta ‘2003’ (made on 1988). My little fixed 2
blade prop does reasonably OK in forward…I am looking to upgrade
motoring speed (around 4.5-5 knots currently) and reduce fuel use
and sailing drag.
Does any one here actually use a 3 blade PYI Max-Prop? That is my
top choice right now…
Does anyone think that there is no useful reduction in drag from a
fixed 2 blade to a feathering 3 blade?
Thanks,
Julian
BCC #86 “Patience”
You should be getting more than that out of your 28 HP engine if the
prop is right, I would think. I suspect you may be underpitched. Do
you easily reach full RPM? I had a fixed 3 blade, switched to a 3
blade MaxProp. No regrets. Do a search on this board for “maxprop”;
lots of info available. Do not know about difference in drag between
a 2 blade. If it can be aligned with the “deadwood”, drag should be
decreased, but I suspect most people would find it too much bother to
do so routinely.
John Churchill
John,
I am curious if you know the setting for pitch for your Maxprop. I have
the same 3GM27 and 3 blade Maxprop. I seem to get hull speed at about 2400
RPM . I understand that perhaps hull speed should be achieved at clsoer to
full RPM of about 3000 RPM.
The prop gererallly works great and have had no problems as long as I keep
it clean.
I am in the Hudson River and in July and August I need to don the mask to
keep it clean as the river water warms causing an accumulation of slime and
then barnacles can grow with surprising speed.
Regards
Mark
SV Itchen # 73
----- Original Message -----
From: <jchurchill@erols.com >
To: <bcc@yahoogroups.com >
Sent: Tuesday, January 14, 2003 10:30 AM
Subject: [bcc] Re: feathering prop, shmethering prop
I am still looking for a good feathering prop for my BCC. I have a
trusty 28 HP Volvo Penta ‘2003’ (made on 1988). My little fixed 2
blade prop does reasonably OK in forward…I am looking to upgrade
motoring speed (around 4.5-5 knots currently) and reduce fuel use
and sailing drag.
Does any one here actually use a 3 blade PYI Max-Prop? That is my
top choice right now…
Does anyone think that there is no useful reduction in drag from a
fixed 2 blade to a feathering 3 blade?
Thanks,
Julian
BCC #86 “Patience”
You should be getting more than that out of your 28 HP engine if the
prop is right, I would think. I suspect you may be underpitched. Do
you easily reach full RPM? I had a fixed 3 blade, switched to a 3
blade MaxProp. No regrets. Do a search on this board for “maxprop”;
lots of info available. Do not know about difference in drag between
a 2 blade. If it can be aligned with the “deadwood”, drag should be
decreased, but I suspect most people would find it too much bother to
do so routinely.
John Churchill
The BCC #117 (Jill White & Tom Unrh) has studied performance and send us
following message in last year.
“looked up the settings for our Max-prop. PYI’s initial recommendation of
22 degrees was way too steep, and we ended up at 16 degrees, or 8.6 inches
of pitch. The actual letter settings are x=C, y=K. This gave us 3600 rpm
with a clean bottom. We got a 300 rpm increase for each 2 degree change.”
Max prop Item # 63-316,
16" 3 blades,
16 degrees,
8.6 inches of pitch,
x = C
y = K
I hope it will help your prop setting
Best Regards,
Sumio Oya
Sam L. Morse Co.
----- Original Message -----
From: “Mark Giegel” <epcoinc@frontiernet.net >
To: <bcc@yahoogroups.com >
Sent: Tuesday, January 14, 2003 7:44 AM
Subject: Re: [bcc] Re: feathering prop, shmethering prop
John,
I am curious if you know the setting for pitch for your Maxprop. I have
the same 3GM27 and 3 blade Maxprop. I seem to get hull speed at about
2400
RPM . I understand that perhaps hull speed should be achieved at clsoer
to
full RPM of about 3000 RPM.
The prop gererallly works great and have had no problems as long as I keep
it clean.
I am in the Hudson River and in July and August I need to don the mask to
keep it clean as the river water warms causing an accumulation of slime
and
then barnacles can grow with surprising speed.
Regards
Mark
SV Itchen # 73
----- Original Message -----
From: <jchurchill@erols.com >
To: <bcc@yahoogroups.com >
Sent: Tuesday, January 14, 2003 10:30 AM
Subject: [bcc] Re: feathering prop, shmethering prop
I am still looking for a good feathering prop for my BCC. I have a
trusty 28 HP Volvo Penta ‘2003’ (made on 1988). My little fixed 2
blade prop does reasonably OK in forward…I am looking to upgrade
motoring speed (around 4.5-5 knots currently) and reduce fuel use
and sailing drag.
Does any one here actually use a 3 blade PYI Max-Prop? That is my
top choice right now…
Does anyone think that there is no useful reduction in drag from a
fixed 2 blade to a feathering 3 blade?
Thanks,
Julian
BCC #86 “Patience”
You should be getting more than that out of your 28 HP engine if the
prop is right, I would think. I suspect you may be underpitched. Do
you easily reach full RPM? I had a fixed 3 blade, switched to a 3
blade MaxProp. No regrets. Do a search on this board for “maxprop”;
lots of info available. Do not know about difference in drag between
a 2 blade. If it can be aligned with the “deadwood”, drag should be
decreased, but I suspect most people would find it too much bother to
do so routinely.
John Churchill
Sumio, Thank you for the information. In return, I promise to keep my wife
Maureen, away from your office for a little longer. You will recall that
on her first visit to your facility she wanted to remove anything not bolted
down–on my instructions of course.
Sincerely yours
Mark Giegel
SV Itchen #73
----- Original Message -----
From: “Sumio Oya” <info@samlmorse.com >
To: <bcc@yahoogroups.com >
Sent: Tuesday, January 14, 2003 12:52 PM
Subject: Re: [bcc] Re: feathering prop, shmethering prop
Hi Mark,
The BCC #117 (Jill White & Tom Unrh) has studied performance and send us
following message in last year.
“looked up the settings for our Max-prop. PYI’s initial recommendation of
22 degrees was way too steep, and we ended up at 16 degrees, or 8.6 inches
of pitch. The actual letter settings are x=C, y=K. This gave us 3600 rpm
with a clean bottom. We got a 300 rpm increase for each 2 degree change.”
Max prop Item # 63-316,
16" 3 blades,
16 degrees,
8.6 inches of pitch,
x = C
y = K
I hope it will help your prop setting
Best Regards,
Sumio Oya
Sam L. Morse Co.
----- Original Message -----
From: “Mark Giegel” <epcoinc@frontiernet.net >
To: <bcc@yahoogroups.com >
Sent: Tuesday, January 14, 2003 7:44 AM
Subject: Re: [bcc] Re: feathering prop, shmethering prop
John,
I am curious if you know the setting for pitch for your Maxprop. I
have
the same 3GM27 and 3 blade Maxprop. I seem to get hull speed at about
2400
RPM . I understand that perhaps hull speed should be achieved at clsoer
to
full RPM of about 3000 RPM.
The prop gererallly works great and have had no problems as long as I
keep
it clean.
I am in the Hudson River and in July and August I need to don the mask
to
keep it clean as the river water warms causing an accumulation of slime
and
then barnacles can grow with surprising speed.
Regards
Mark
SV Itchen # 73
----- Original Message -----
From: <jchurchill@erols.com >
To: <bcc@yahoogroups.com >
Sent: Tuesday, January 14, 2003 10:30 AM
Subject: [bcc] Re: feathering prop, shmethering prop
I am still looking for a good feathering prop for my BCC. I have a
trusty 28 HP Volvo Penta ‘2003’ (made on 1988). My little fixed 2
blade prop does reasonably OK in forward…I am looking to upgrade
motoring speed (around 4.5-5 knots currently) and reduce fuel use
and sailing drag.
Does any one here actually use a 3 blade PYI Max-Prop? That is my
top choice right now…
Does anyone think that there is no useful reduction in drag from a
fixed 2 blade to a feathering 3 blade?
Thanks,
Julian
BCC #86 “Patience”
You should be getting more than that out of your 28 HP engine if the
prop is right, I would think. I suspect you may be underpitched. Do
you easily reach full RPM? I had a fixed 3 blade, switched to a 3
blade MaxProp. No regrets. Do a search on this board for “maxprop”;
lots of info available. Do not know about difference in drag between
a 2 blade. If it can be aligned with the “deadwood”, drag should be
decreased, but I suspect most people would find it too much bother to
do so routinely.
John Churchill