In Depth info
Propeller and hub assembly
Background: Experience has shown that the assembly of the hub and props can cause a lot of problems.
Incorrectly assembled components may cause the clutch to slip, the yoke screw to be broken,
and the pitch adjustment to be out of alignment.
If the pitch adjustment knob is not installed correctly, even if the pitch # is set to 9 (full speed)
the actual pitch can be several pitches lower, causing the scooter to run very slow.
THEREFORE THE PITCH NUMBERS CAN NEVER BE USED
TO COMPARE SPEEDS BETWEEN 2 SCOOTERS
If you think your scooter is slow, it is possibly the pitch adjustment.
Propeller installation guide:
Phillips head screw driver
1/8" Allen key/hex tool.
Drive shaft with seal installed and drive pin installed.
Seal should only be replaced by Submerge, installation
is vacuum tested and guaranteed.
Slide clutch plate onto shaft, engaging the drive pin.
Inner Hub installed, note Stainless Steel washer.
Install the clutch washer in the correct pattern.
There are 9 clutch washers.
1st washer goes face down
Next 8 washers go on in face to face pairs.
1st washer on, face down.
All clutch washers on.
Screw down, keep the clutch washers centred.
Next, install yoke screw into yoke all the way, finger tight.
Push Yoke into Outer hub, and start installing prop blades.
All prop blades are installed.
Push assembly onto shaft with palm.
Install 3 screws.
If you have followed the directions
when the yoke screw was installed into the yoke,
The Pitch adjustment can now be installed to #9
position (without turning the yoke screw)
and the pitch should be correct.
If the pitch adjustment is correct, when the pitch
is wound up to #9 it does not bind up or become
harder to wind to the #9 position, AND the prop
blades come right up to touch the hub, as shown above,
without any gaps.
The last check, if the pitch is set to #1 the scooter
should have minimal thrust, this is a safety feature
in case the scooter runs on you can de-pitch and the
scooter will not pull you or the cave line/silt too much.
Last note: the AUL brand hub assembly sometimes used as an aftermarket
accessory does not have any pin (see picture below) controlling the
pitch adjustment, in other words it can be wound below #1 (
even reverse!) and slightly above #9, which can give it more speed
than a properly adjusted Oceanic hub.
The danger is it can be wound until it breaks the yoke, the
positive is it can give a little more speed at the risk of
burning out the motor if used for long periods (>30 minutes)
If you only use your scooter in the ocean where it is safer than
in caves, and efficiency is not as important, you can adjust the
pitch knob 1/4 turn anti clockwise so that when on # 7 it is
really on #9.
If you make this modification, you risk breaking the yoke if you
use to much force to wind it to #9 (it may only go as far as #8)
and when wound to minimum #1 it will still have about 15 pounds
Submerge hub/prop assemblies use stock Oceanic Mako components
with these exceptions:
1) Submerge manufactures a replacement aluminium clutch plate, similar to the AUL
clutch plate (sometimes referred to as the "WKPP clutch").
2) We drill and thread the prop blades and insert a 1.25" set screw.
3) We replace the screw in the end of the shaft from the original Phillips head to
an Allen key/hex type. The Phillips head will strip out if the screw seizes in the shaft,
a common problem if used in salt water.