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Propeller
Kits & Rubber Hub
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¡¯Rubber
Hub |
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Propeller
Accessories
Besides propellers
for many popular makes of outboard motors,
SOLAS also provides a large section
of propeller hardware for proper installation.
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 Understanding
Boat Propeller Assemblies
On
the Propshaft
A typical recreational boating propeller
is mounted on a splined propshaft with
a thrust washer, spacer, washer and nut,
with some provision to keep the nut from
turning loose, such as tabs on the washer
or an additional cotter pin. There are
exceptions, like the shear pin systems
that were once widespread, but now most
are as we describe here.
Thrust
Washer
The thrust washer is mounted on the propshaft,
between the lower unit and the propeller,
and it may or may not have splines. It's
an important component of a boat propeller's
installation, because it fits the shaft
in such a way that will not allow either
itself or the propeller to move forward
under thrust, thereby transferring thrust
to the shaft and protecting the gear housing
and its seal from contacting the rotating
propeller.
A matching taper
on the propshaft and the washer is one
effective design that stops a thrust washer
from moving too far forward.
The thrust washer also helps to keep the
propeller centered on the shaft when the
soft inner prop hub fails to do so under
adverse high-torque conditions.
Hub
Inserted in the prop is a splined inner
hub, which serves as a shock absorber
between the prop blades and the shaft.
A good prop hub should keep the propeller
precision-centered on the propshaft, dampen
vibrations and help protect the shaft
from the severe shock of striking a submerged
object with the propeller.
There are two basic types of hub (in addition
to some rare specialty hubs): a pressed
rubber hub or an interchangeable hub.
The pressed hub is semi-permanently forced
into position by a high pressure press
in a prop shop. By contrast, the interchangeable
hub is easily inserted by the prop installer.
Each propeller is designed to use one
type or the other. While pressed hubs
are made of rubber, interchangeable hubs
are sometimes made of a more rigid material,
but we find that rubber interchangeable
hubs offer better vibration dampening.
What's the difference
between Rubex and Solas? Most Solas propellers
are of the pressed rubber hub type and
a few have specialty pin drive hubs. All
Rubex props use interchangeable rubber
hubs. There you have it!
Spacer
Like the thrust washer, the spacer assists
alignment of the prop to the shaft when
the inner hub is unable to hold its shape,
only this time at the aft end of the prop.
The spacer bears reverse thrust loads
and prevents the inner hub from moving
aft, with its large surface area. The
final washer and nut prevent the spacer
from moving aft.
Many spacers are splined and some, for
numerous Mercury, Mariner and Mercruiser
applications, are also cogged or pinned
to work in conjunction with an outer tab
washer to prevent the nut from turning
loose.
Washer
The washer helps fill space between the
spacer and the nut, where the splines
on the propshaft end and the threads begin.
This helps prevent fore and aft play on
the shaft by the prop.
A tab washer can be used if the spacer
is designed for one. Otherwise, a large
traditional washer would be expected on
an assembly that uses a cotter pin to
retain the nut.
When used, a tab
washer's primary function is to prevent
the nut from rotating in relation to the
spacer.
Prop
Nut
The prop nut secures the prop to the shaft
and helps transfer reverse thrust to the
shaft.
Normally made of brass, a nylon locknut
is used in conjunction with a tab washer
or else a castellated (castle) nut is
used with a cotter pin.
Cotter
Pin
Where used, the cotter pin passes through
a hole in the propshaft after the castle
nut has been tightened with its slots
aligned on both sides of the hole.
Conclusion
With so few pieces, a prop assembly is
not complicated. Because each of the parts
in the prop assembly performs an important
function, it is important to use the correct
parts and to install them all as intended.
To maintain the correct positioning, spacing
and integrity, each part must be made
to match both the propeller and the drive
unit that it's going on.
Whenever doing a
propeller installation, use your knowledge
and pay particular attention to any instructions
that may be provided with your prop or
hub kit, especially concerning which parts
to use.
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Note:All the Original kits(O.E.M) are still usable.
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| Rubber Hub |
| After many years of
research and development, SOLAS has
developed an advanced series of rubber
bushings with a strong and durable
rubber compound. These rubber hubs
are specially to install simply by
pressing them into the hub with a
minimum of effort. However, they still
offer excellent gripping force to
keep the propeller from slipping. |
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Group
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Engine
Brand
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Part
Number
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Picture
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Fit
O/E Propeller
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5~9.8HP
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O8-RB
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YES
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| Yamaha |
Y8-RB
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NO
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| Tohatsu |
T8-RB
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YES
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A
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Mercury/Mariner (~96)
25mm
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MA-RB
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YES
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| Yamaha/Honda |
YA-RB
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YES
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| BRP/OMC/Evinrude/Johnson |
OA-RB
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YES
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| Suzuki |
SA-RB
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YES
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| Tohatsu/Nissan |
TA-RB
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YES
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B
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Mercury/Mariner
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MB-RB
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YES
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| Yamaha |
YB-RB
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YES
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| BRP/OMC/Evinrude/Johnson |
OB-RB
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YES
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| Suzuki |
SB-RB
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YES
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| Tohatsu/Nissan/Honda
(S/S Prop) |
TB-RB-1
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YES
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| Tohatsu/Nissan/Honda
(Amita) |
TB-RB-2
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NO
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C
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Mercury/Mariner
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MC-RB
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YES
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| Yamaha/Honda |
YC-RB
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YES
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| BRP/OMC/Evinrude/Johnson |
OC-RB
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YES
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| Suzuki |
YC-RB
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YES
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| Tohatsu/Nissan |
YC-RB
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YES
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D
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Mercury/Mariner/Honda
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MD-RB
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YES
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| Yamaha |
YD-RB
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YES
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| BRP/OMC/Evinrude/Johnson |
OD-RB
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YES
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| Suzuki |
SD-RB
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YES
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| Tohatsu/Nissan |
YD-RB
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YES
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| Force
(~94) |
YD-RB
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YES
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E
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Mercury/Mariner/MerCruiser(Amita)
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ME-RB-2
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YES
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| Mercury/Mariner/MerCruiser(S/S) |
ME-RB-2
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YES
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| Yamaha
(Amita) |
YE-RB-2
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YES
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| Yamaha
(S/S) |
YE-RB-2
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YES
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| BRP/OMC/Evinrude/Johnson
(Amita) |
OE-RB-2
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NO
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| BRP/OMC/Evinrude/Johnson
(S/S) |
OE-RB-1
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YES
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| Suzuki
(Amita) |
SE-RB-2
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YES
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| Suzuki
(S/S) |
SE-RB-2
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YES
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F
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Mercury Bravo Two
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MF-RB
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YES
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Volvo
Penta
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Aquamatic SP (Long
Hub)
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VA-RB
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NO
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| SX
Drive (Amita) |
VE-RB-2
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NO
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| SX
Drive (S/S) |
VE-RB-1
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YES
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