A ship's propeller is possibly the most essential component of a
motorboat. It requires a lot of attention, both by the naval
architect and by the propeller manufacturer. "Specialists", who
are able to tell you "off the cuff" what type of propeller your boat requires,
simply do not exist. TechProMax makes good use of
an especially developed computer program, which ensures the
determination of the exactly right propeller for your boat, with
the aid of some (correct) information, which we require from
are the most important demands made upon a ship's propeller?
If you bear in mind that a propeller is often rotating at 2.000
r.p.m. (which is more than 30 revolutions per second!),
you will appreciate that a good ship's propeller should be
well-balanced. A difficult and time-consuming job, but an
absolute must" nonetheless.
In order to achieve the best performance and to prevent
vibrations, it is extremely important to ensure that the pitch
of each blade s identical and also that the distance between the
blades does not vary. Again, this requires great manufacturing
"Bronze" is the common denominated a great variety of alloys.
TechProMax propellers are made of manganese
bronze, an extremely resilient, yet very flexible material.
By virtue of their material specifications,
propellers, when damaged, can nearly always be repaired. The
choice of a good (TechProMax) propeller combining
all qualities mentioned above, is therefore of utmost
importance! The diameter and the pitch of ship's propellers are
early always given in inches (1" = 25.4 mm). All propellers
with dimensions which deviate from standard sizes are available
with a delivery time of 10 to 12 weeks.
The blade area
In order to specify the correct propeller, the propeller
specialist must first of all determine the required Fa/F ratio.
Each propeller has a fixed Fa/F ratio. This means the
area of the propeller circle (F) in comparison to the surface
area (stretched and developed) of all blades together (Fa). The
choice of the Fa/F ratio is dependent on the shape of the
underwater section and the speed of the boat in question.
Top quality zinc-plated measuring device for exact determination
of the diameter and pitch of marine
propellers up to a maximum diameter of 560 mm and a maximum
shaft hole diameter of 50 mm (for pitch
measuring only: suitable for propellers with maximum diameter of
up to 800 mm).