ProPulse Frequently Asked Questions
is ProPulse made of?
A high density composite, which is the same material race-car parts are
made from. Also, some new outboard power heads are made from similar
Is the material
The composite that is used for ProPulse is stronger than aluminium and
resistant to corrosion and cavitation damage. The hub has a 3 year
Does it fit to
ProPulse fits all of the most common outboard brands and stern drives
between 18 and 300Hp (see motor
Why four blades
instead of three?
A four blade propeller is easier to balance and has a better grip in
the water. It has more traction, smoother operation, quicker acceleration,
better cornering and handling and holds the boat on the plane at lower
different pitches can be adjusted?
4901 and 4902 - 11"-17" with 7 pitches
6901 and 6902 - 11 "-17" with 7 pitches
8901 and 8902 - 15"-21" with 7 pitches
9901 and 9902 - 14"-22" with 9 pitches
How can you
adjust the pitches?
By slackening the bolts approx. 4 turns, so that the ring can be
lifted about 2mm. The chosen pitch can be set by turning two opposite
blades whilst watching the pitch gauge. The pitch is locked by
retightening the bolts crosswise. (see operating instructions "Adjusting
What is the
advantage with adjustable pitch?
You can optimise the rpm of your engine and get the best performance
from your combination of boat and engine ie. highest speed, lowest fuel
consumption and best holeshot.
What pitch is
At full power your engine should run at the correct specified rpm
range (see instruction Manual for engine). It is harmful to run the engine
above or below the recommended range. If maximum rpm is too high or low,
adjust the pitch until correct.
To increase by 200rpm – Reduce the pitch by one increment.
To decrease by 200rpm – Increase the pitch by one increment.
What is the
advantage of replaceable blades?
If the Propeller is damaged, it is easy to replace blades on the spot
and carry on immediately with your trip. It is cheaper than a repair or
buying a new propeller. Also, this is more accurate than a repair.
How do I change
By unscrewing and removing the four bolts so that the ring and the
rear hub section can be removed and the damaged blade replaced. (See
operating instructions "How to replace the
Do all four
blades break if I run aground?
The blades are designed to snap off in the event of the boat running
seriously aground. This is to prevent damage to the engine and
transmission (most commonly, only one or two blades will break). When this
happens to an aluminium prop all three blades will brake and the bushing
generally goes as well.
Propellers fit stern drives also?
What is the
size difference between 3 and 4 blade propellers?
As a general rule when converting a 3 blade prop size to a 4 blade prop
size, you would reduce pitch by 1". For example, a 17" pitch 3 blade
propeller would become a 16" 4 blade propeller.
Order Your ProPulse
Wm. Olds & Sons Pty. Ltd. trading as OLDS ENGINEERING
ABN 33 009 859 250 - MECHANICAL ENGINEERING & FOUNDRY
78-80 North Street, Maryborough Q, 4650 Australia
P.O. Box 3030, Pallas St. Post Office, Maryborough Q, 4650
Phone: 07 4121 3649 Fax: 07 4123 3590 International Phone +61 7 4121 3649 Fax: +61 7 4123 3590
Innovative Engineering Excellence ~ serving over 100 years