wow

BCC Forum
1

that is a lot different than mine, which is set at 11" pitch. do we
have different gearboxes perhaps?
john churchill

— In bcc@yahoogroups.com , “Sumio Oya” <info@s…> wrote:

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@f…>
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@e…>
To: <bcc@yahoogroups.com >
Sent: Tuesday, January 14, 2003 10:30 AM
Subject: [bcc] Re: feathering prop, shmethering prop

— In bcc@yahoogroups.com , “pelenur <pelenur@y…>”
<pelenur@y…>

wrote:

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

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