MAX PROP WHISPER 5 BLADES User manual

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MAX PROP WHISPER
INTRODUCTION
Thank you for having chosen a MAX PROP® WHISPER
auto atic feathering propeller for your vessel. This
instruction booklet is designed to answer to all your
questions on asse bly and use of the propeller. Please
read it carefully and verify the correct working of the
propeller before installing it on your boat.
INSTALLATION
Please, do as follows with reference to fig. 1. The
propeller is supplied already asse bled for right or left
rotation, according to the infor ation received with the
order and with the pitch required, so that it can directly
fit on the shaft. MAX PROP® WHISPER parts are NOT
interchangeable. Please, ake sure , if you receive ore
than one propeller, that you do not interchange parts.
a) Fit the already asse bled propeller to the shaft, as if
it was a fixed propeller, and ake sure that the key
has proper di ension: a good key has al ost no
clearance side to side but a very s all clearance on its
upper surface. This clearance is to avoid the propeller
to be pushed out of center by a key which is too tall.
b) Tighten the nut and secure it in place using the two
allen head screws.
c) Fill the prop with arine grease using the grease fitting
(supplied) inserted into the grease holes arked
“grease”. The MAX PROP® WHISPER propeller works
properly only if the central body is co pletely filled
with the correct grease. Verify that the grease is oozing
fro the rotating joints between the central part and
the hub, so that all of the oving surfaces are perfectly
oiled. The grease used ust be a type of grease
approved by MAX PROP® so it will re ain fluid after
years of use and will not get too stiff in cold water.
Fig. 1
d) Move the blades into the feathered position, aking
sure that the rounded trailing edges of the blades are
aft as shown in fig. 2.
Fig. 2
e) Before launching the boat, it is absolutely necessary to
operate as follows:
• Hold the propeller shaft.
• Check that the blades of the propeller rotate freely
fro the forward to the reverse position just by a
light effort
• In the feathered position the blades ust be
perfectly lined up and set like fig. 2
• Check that the propeller body is full of fluid arine
grease
• Make sure that the propeller is protected fro
galvanic corrosion by using the usual zinc anodes on
the propeller and the shaft.
PITCH ADJUSTMENT
The pitch on a MAX PROP® WHISPER changes according to
the dia eter of the propeller and the blades rotation angle
α. fig. 3 shows the pitches in illi eters corresponding to
the degree of blades angle for a given propeller dia eter.
Propeller Diameter (millimeters)
00 50 400 450 500 550 600 650 700 750 800
α Blades inclination angle (degrees)
10° 100 115 130 150 170 185 200 215 230 250 265
12° 120 140 160 180 200 220 240 260 280 300 320
14° 140 165 190 210 235 260 280 305 330 350 375
16° 160 190 215 245 270 300 325 350 380 405 430
18° 180 215 245 275 305 335 365 400 430 460 490
20° 205 240 275 310 345 375 410 445 480 515 550
22° 230 265 305 340 380 420 455 495 535 570 610
24° 250 295 335 375 420 460 505 554 585 630 670
26° 275 320 370 415 460 505 550 590 645 690 735
28° 300 350 400 450 500 550 600 650 700 750 800
0° 325 380 435 490 545 600 655 705 760 815 870
Fig. 3

2
Dia eter and pitch ust be calculated as if MAX PROP®
WHISPER were a nor al fixed propeller. MAX PROP®
WHISPER then offers the great advantage of pitch
adjustability in order to better opti ize the perfor ance
of the propeller. If the engine does not reach the desired
RPM, reduce the blade angle α ; on the contrary, if the
engine exceeds the desired RPM, increase the blade angle
α. With a 2 degrees variation of the blade angle, the speed
of the vessel varies 14% at the sa e RPM or the RPM varies
14% at the sa e speed of the vessel
PROCEED AS FOLLOWS IN ORDER TO CHANGE THE PITCH, WITH
REFERENCE TO FIG. 3 AND 4
Fig. 4
a) Pitches of the propeller corresponding to blades
inclination and propeller dia eter are shown in
illi eters in fig. 3
b) In the body of every propeller are opened two
threaded bores, arked with letters “R” and “L”;
within these bores are placed two poles (screws).
c) The pitch of the propeller, both in front and reverse
position, can be easily varied changing poles (screws)
asse bled on the body of the propeller with other
poles (screws) having a different length. If the
propeller is right-handed, pitch in front position
varies changing the pole (screw) placed in bore “R”
and, in reverse position, changing the one placed in
bore “L”. If the propeller is left-handed, pitch in both
position varies changing the relative poles (screws)
placed in bores “L” and “R”
d) The list of the pitch regulation poles, that are
supplied with every WHISPER propeller is indicated in
fig. 5
e) Inserting in the threaded bores “L” or “R” opened in
the body of the propeller the poles (screws) 20 and 2,
the blades assu e a 20 degrees inclination, both in
front position and reverse position. Varying 1
illi eter the length of the poles (screws), blades
inclination has a 2 degrees variation
f) In every single propeller:
− pole (screw) 20 has the sa e length as pole (screw) 2
− pole (screw) 16 has the sa e length as pole (screw) 3
− pole (screw) 24 has the sa e length as pole (screw) 1
LIST OF THE PITCH REGULATION POLES (SCREWS) THAT
ARE SUPPLIED WITH EVERY "WHISPER" PROPELLER
BLADES
INCLINATION
(DEGREES)
RIGHTHAND ROTATION LEFTHAND ROTATION
FORWARD
POSITION
BORE “R”
REVERSE
POSITION
BORE “L”
FORWARD
POSITION
BORE “L”
REVERSE
POSITION
BORE “R”
16
16
1
16
1
18
18
18
20
20
2
20
2
22
22
22
24
24
24
Fig. 5
INSTRUCTIONS TO CHANGE PROPELLER ROTATION
With the MAX PROP WHISPER® it is also possible to change
the rotation, e.g. if you change the engine, or if there
was a istake when ordering the prop. If you have doubts
about the engine rotation, it can be deter ined looking
forward fro the stern of the boat. With the engine in
forward position a clockwise rotation of the propeller
eans it is right handed(R), and a counter-clockwise
rotation is left handed (L).
In order to change the rotation of the MAX PROP
WHISPER®, fro a right hand rotation to a left hand
rotation or vice versa do as follows, referring to fig. 6
• Unscrew the locking-zinc screws, and re ove the zinc
• Unscrew the locking-nut screws and re ove the nut
Fig. 6
• On the aft edge of the hub there is a security ring
“Seeger” that ust be slipped off)
• Release the zinc-bearing ring

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• Once released the zinc-bearing ring, you see that on one
tooth of the hub (the aft side)there is a reference ark,
and two teeth of the bearing-zinc ring are arked one
with “L” and the other with “R”.
• If you place the zinc bearing ring in its seat again,
atching the “L” tooth with the hub reference ark,
you have a left hand rotating propeller, on the contrary,
with the “R” tooth you have a right rotating propeller as
in fig. 6
• Place the “Seeger” ring in its seat
• Tighten the nut and secure it with the locking-nut
screws
• Place the zinc again, and secure it with the 3 proper
screws:
PROPELLER USE
The MAX PROP® WHISPER works auto atically. By putting
the engine in gear the blades will engage in either
forward or reverse (WARNING: do not change fro
forward to reverse and vice versa when the engine is
running at high RPM) and feathers fro forward position
when you turn of the engine and block the shaft.
The best way to feather the propeller is:
• Power at 2 to 3 knots in forward
• Turn off the engine while still engaged in forward.
• If your propeller has been greased properly it will
feather in a fraction of a second as soon as you stop
the shaft fro freewheeling.
DO NOT kill the engine while in reverse. In this case
the blades will be in the reverse position and will not
feather. You can actually use this feature to drive a
shaft alternator.
Modern engine trans ission are either echanical or
hydraulic. With a echanical trans ission, the best
way to stop the shaft freewheeling is to engage the
trans ission in reverse (WARNING: engage the reverse
only after the engine has stopped co pletely).
With a hydraulic trans ission you ust shut off the
engine while still engaged in forward. The re aining
hydraulic pressure will en effect lock the shaft for a
few o ents, enough for the MAX PROP® to feather.
• If the oving trans ission kine atic is provided with
an hydraulic inverter, the otor shaft can get
auto atically stopped asse bling the brake supplied
by MAX PROP® with an extra charge.
WARNINGS
In order to avoid a shock to the gears on the blades and
cone gear, that could be da aging the teeth, it is
i portant to follow the instructions below carefully:
• When going fro forward to reverse and the opposite,
it is necessary to idle down and shift at low RPM’s
between gears
• The propeller ust always be co pletely filled with a
reco ended grease.
• Make sure that you always keep the zinc anodes in
good condition. They ust be replaced at least once
a year, even if they still look ok. The propeller ust
be protected by a lot of zinc, so also use a zinc on the
shaft when possible. When replacing it ake sure that
you clean the contact point between the zinc and the
propeller shaft in order to have a good electrical
contact.
PROPELLER REMOVAL
In order to re ove the propeller you ust first re ove the
zinc and unscrew the nut , then pull off the prop using
MAX PROP® extractor, or a si ilar tool with external
threading, as per fig. 7. Tighten the five screws (that ust
be long enough and provided with 5 nuts) in the five
threaded bores ade in the zinc, being careful that all the
five screws are well tighten until the end of their threaded
bores. Make the five nuts lean against the pierced disc
that serve as extractor. (see fig. 7). Start unscrewing very
gently the locking nut, that in this way will push against
the MAX PROP® extractor and verify whether all the five
extracting screws work together with the sa e load while
extracting the prop. Go on unscrewing the nut slowly,
being careful not to load the screws too uch, in order to
avoid the to brake.
Fig. 7

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INSTRUCTIONS FOR THE PROPER WORKING OF THE
BLOCKING NUT OF THE PROPELLER (FIG. 8)
Fig. 8
When it is tightened on the otor shaft, the nut ust
contact only the 2 surfaces S2,S3. Therefore, when you
work the nut, you ust be sure that length L2 coincides
precisely with the length L5, easured on the prop hub,
and that length L3 is greater than the length L6 of the
threaded edge of otor shaft.
Check that the following di ensions are respected:
• L2 = L5
• L3 greater than L6
• L1 = L7 - 1
• L4 = L8 - 1 .
GENERAL SALE CONDITIONS
1) Max Prop Srl produces her own propellers to easures,
expressly as the custo er requires
2) Max Prop grants that every propeller produced is
tested and leaves the workshop in perfect functioning
conditions.
3) Max Prop Srl. is willing to repair and replace free of
charge, the original pieces of the propeller which ay
result da aged due to construction defects or due to
aterial defects. Max Prop will not pay, for any
reasons any refund whatsoever , not even partial. The
warranty granted by Max Prop Srl. is therefore li ited
exclusively to the repair or replace ent of any
possible defective propeller and does not include any
da age co pensation refund, or clai of any kind.
4) The reparations in warranty that ight be needed will
be carried on exclusively by Max Prop at its own
workshop in Italy – Milan, via Bernardino Galliari 1.
The custo er will, at his own charge and care, send
the defective pieces to Max Prop’s workshop.
5) This warranty is valid 12 onths starting fro the date
of propeller delivery.
6) The custo er confir s that the purchase price of the
propeller has been established considering his
acceptance of the present general conditions of sale.
With this acceptance the custo er excludes, any type
of clai as advised in point n° 3.
7) Any possible controversy will fall within the
jurisdiction of the Milan Courts-Italy
8) These conditions of sale are integral part of any
purchase contract agreed with Max Prop Srl.
Manufactured by:
MAX PROP PATENTED PROPELLERS
MAX PROP SRL – Via Bernardino Galliari, 1 – 20156 MILANO
Tel. [phone] - Fax [phone]
[email protected] - www. axprop.it
®