Pyi Max Prop 3 Blade Instructions
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1) INTRODUCTION: Thank you for having chosen a Max-Prop automatic
feathering propeller for your vessel. This instruction booklet is designed to
answer all your questions on assembly of the Max-Prop. Please read it
carefully and assemble the propeller at least once before installing it on your
Automatic Feathering Propeller 2) PITCH ADJUSTMENT This is a critical step , make sure that you know
what pitch to set the propeller at, either by your old propeller or by your
engine and reduction ratio.
· The pitch is adjustable from 10 to 30 degrees of blade angle.
· Figure 1 shows the conversion from inches of pitch to degrees of blade
Installation Instructions · To properly convert from inches to degrees follow steps A thru C.
A) Determine the diameter of your propeller
B) Go down the column that corresponds to your propeller diameter until
THREE BLADE CLASSIC you find the desired amount of pitch.
C) Cross reference this pitch in inches to the blade setting angle directly
across the chart and you will have the desired blade angle.
Propeller Diameter in inches
12" 13" 14" 15" 16" 17" 18" 19" 20" 21" 22" 23" 24" 25" 26"
10 deg 4 4.3 4.6 4.9 5.2 5.5 6 6.3 6.7 7.1 7.4 7.7 8 8.3 8.6
12 deg 4.8 5.2 5.6 6 6.4 6.8 7.2 7.6 8 8.4 8.8 9.2 9.6 10 10.4
Max-Prop Blade Setting Angle
14 deg 5.6 6 6.6 7.1 7.6 8 8.4 8.8 9.4 9.8 10.4 10.8 11.2 11.6 12.2
16 deg 6.4 6.9 7.6 8.1 8.6 9.1 9.8 10.3 10.8 11.3 12 12.5 13 13.5 14
18 deg 7.2 7.8 8.6 9.2 9.8 10.4 11 11.5 12.1 12.8 13.4 14 14.6 15.2 16
20 deg 8.2 8.9 9.6 10.3 11 11.6 12.4 13 13.7 14.5 15 15.6 16.4 17 17.8
22 deg 9.2 10 10.7 11.4 12.2 12.9 13.6 14.3 15.1 16 16.8 17.5 18.2 18.9 19.8
24 deg 10 10.9 11.8 12.5 13.4 14.2 15 15.8 16.8 17.6 18.4 19.2 20.2 21 21.8
26 deg 11 12 12.8 13.8 14.7 15.7 16.6 17.4 18.4 19.3 20.2 21 22 22.9 23.8
28 deg 12 13 14 15 16 17 18 18.9 20 21 22 23 24 25 26
30 deg 13 14 15.1 16.2 17.3 18.5 19.6 20.6 21.7 22.8 24 25 26.1 27.3 28.2
Pitch in inches
12532 Beverly Park Rd Max-prop offers the great advantage of pitch adjustability in order to optimize the
performance of the propeller. If the propeller does not reach the desired RPM,
Lynnwood, WA 98087 reduce the blade angle. If, on the contrary, the engine exceeds the desired RPM,
Office (425) 355-3669 increase the blade angle. A two degrees change in blade angle will change the
engine RPM by 13-15%, at the same boat speed. The adjustment of angle and
Fax (425) 355-3661 therefore of pitch is done, when the propeller is mounted on the shaft. To obtain
Email: Info@pyiinc.com the different values of angle you have to follow the assembly instruction.3
3) ASSEMBLY: Make sure that if you receive more than one propeller that do 2) No Drill Nut: Tighten the nut (4) onto the shaft.Align the groves in the base of
not interchange parts. Each propeller is individually balanced and if the nut with the groves in the central hub, so as to obtain two complete holes
interchanged it will be put out of balance. Please use figure 2 in the allowing insertion of the pins (5). Insert the pins, then rotate the pins are as
instruction book for part number references. shown in the drawing below, so as not to interfere with the inserting of the
central cone gear (see figure below).
One thread can be exposed aft of either nut system, if more than that are
showing it will be necessary to cut off the excess with a hack saw. If too many
threads are exposed it will raise the central cone gear (6) and effect the
performance of the propeller.
C) On the bottom of the central gear (6) there is a groove on the bottom of one
of the teeth, this represents the "X" on the chart in figure 3. Place the tooth
with the groove into the corresponding lettered gear on the hub (1).
Fig.2 28° D
A) Fit the hub (1) to the propeller shaft (2). Be sure that the key (3) is the proper
dimension and that the hub slides completely onto the shaft. If you are not
sure, remove the key and slide the hub onto the shaft making a mark on the
shaft where the hub stops on the shaft. Re-insert the key and slide the hub 16° C
on to the shaft, if it slides up to your mark , it is fine. If not, you will need to ABCDEHKLNPSTV 12° P
file down the sides or top of the key until the hub slides completely onto the 10° L
shaft. 0° K
B) Two types of nuts are available in the Max-prop: 12° D
1) Drilled Nut: Tighten the nut (4) onto the shaft and secure it with the 18° N
pin by drilling a hole completely through the nut and shaft (a cobalt 20° K
drill bit makes this task easier). 22° E
Fig.3 28° P
D) Fill the two halves of the spinner (7) with a sea water grease. From our
experience Lubraplate "130 AA" grease has worked best. Close the two
halves around the hub and tighten down the screws.
NOTE: DO NOT USE TEFLON GREASE it will wash out very quickly.
E) Locate the mark on the top inside of the spinner (a small drill hole). This is F) Insert the three blades onto the three pins of the spacer (10). Fill the end
the "Y" mark in figure 2. Rotate the spinner until the "Y" mark on the spinner cap (11) with grease and put the blades into the three seats of the end cap.
coincides with the correct letter on the top of the central cone gear. This letter
is determined from the chart in figure 4. Fill the top of the spinner with
14° B NOTE: Make sure that the numbers on the blades correspond to the
12° C numbers in the spacer and the numbers on the end cap 1 to 1, 2 to 2,
10° D and 3 to 3.
10° D G) Move the blades to a feathered position, making sure that the rounded
12° E trailing edges of blades are aft as shown in figure 6. Slide the end cap and
HED 14° H feathered blades on to the spinner, make sure that the numbers on the
blades and spinner match. Next tighten down the end cap with the screws.
20° C NOTE: Check to see that the spinner did not rotate. If it did move pull the
blades back 1/4" and then realign the mark between the spinner and the
hub. Make sure that when the blades go on to the spinner that they are fully
Fig.4 28° A feathered.
H) To make the blades rotate more freely it is advisable, after tightening all the
screws, to give some bedding blows on the spinner and blades with a plastic
NOTE: It is helpful to make a mark between the spinner and exposed part of or wooden mallet.
the hub or tape them so that any rotation can be noted and corrected. If the
spinner is rotated before the blades are attached it will alter the blade angle. I) To make sure that the screws will not loosen insert a 1/16" stainless steel
cotter pin into the head of each screw. Put them on so that if the screw were
to loosen it would hit the cotter pin as shown in figure 5. Cut the cotter pins
to a length of 1/4" and put them in. A tight tap with a hammer on the head of
the pin will spread the ends open, if not use a screw driver to spread them
no! yes unscrewing
J) Make sure that the propeller is protected from galvanic corrosion by using On the contrary if the blades rotation is hard, remove 0.01 mm from
zinc anodes on the propeller shaft and on the end cap of the propeller. If the surfaces "B" of the spacer using emery cloth wrapped around a flat
propeller has been assembled properly: file. Try until both hub and blades rotate freely.
· The blades must rotate freely and stop at the blade angle you selected.
· In the feathered position the blades must line up perfectly as in figure 6. 2) Again mount the central cone gear (6) and reassemble the propeller. If
· The propeller must never rotate as shown in figure 7. the propeller rotation still has some hard points remove 0.1 mm with a
flat file from surface (C) so that central cone gear sits lower and the
clearance between conical gears increases.
5) PROPELLER USE The Max-prop works automatically. By putting the engine
in gear the blades will engage in either forward or reverse. The best way to
feather the propeller is:
· Power at 2 to 3 knots in forward.
· Kill the engine while still engaged in forward.
Fig.6 Fig.7 · When the engine has stopped, if the shaft is still spinning engage the
transmission in reverse to stop the freewheeling.
yes no! You can check to see if the propeller is feathered or not by taking the engine
out of gear. If the propeller is not feathered the shaft will freewheel like with a
4) TROUBLE SHOOTING If the propeller feels stiff or has a hard spot in the fixed blade propeller.
rotation systematically go through the points below.
In that case start the engine again and repeat the three steps. If your
A) If the propeller does not rotate freely, remove some of the grease from propeller has been greased properly it will feather in a fraction of a second as
the spinner and reassemble. soon as you stop the shaft from freewheeling. Once the prop is feathered,
you can either leave the transmission in gear or out of gear, it does not
B) Sometimes it can happen that a small piece of metal or burr enters matter. DO NOT kill the engine while in reverse. In this case the blades will
among the gears, or a piece of the propeller has been dinged; in this be in the reverse position and will not feather. You can actually use this
case the blade movement can become hard. It is necessary then to do feature to drive a shaft alternator.
as follows, referring to figure 8.
6) PROPELLER MAINTENANCE The Max-prop needs to be regreased a
minimum of once every two years.We recommend Lubraplate "130 AA"
There are two holes in the spinner of the propeller to grease. Remove the
set screw from the forward holes with a #3 metric Allen wrench and screw
in the zerc tower, attach your grease gun and fill the propeller with grease
until the grease starts to come out between the hub (1) and the spinner (7).
Replace the set screw and remove the set screw from the more aft hole.
C Reinstall the zerc tower and attach your grease gun and fill the propeller with
grease until the grease starts to come out between the blades and the
spinners. Remove the zerc tower and reinsert the set screw into the
6 propeller. Do not leave the zerc tower in the propeller.
1) Open the propeller and assemble it again after having taken the
central cone gear (6) out, so that the blade and the hub rotation are
independent. If the hub rotation is hard, remove 0.01 mm from
surfaces "A" with an emery cloth.
· With each pump of the grease gun rotate the propeller from forward to reverse
to allow the grease to work through the propeller.
· The numbers above are from Figure 2 at the beginning of this Max-prop Manual
· Make sure that you always keep the zinc anodes in good condition. They
must be replaced at least once a year. The propeller must be protected by a lot Automatic Feathering Propeller
of zinc, so also use a zinc on the shaft when possible. When replacing it make
sure that you clean the contact point between the zinc and propeller. Use a
wire brush or fine sandpaper to clean the aft of the end cap and the forward
face of the zinc to give the zinc good contact with the propeller.
7) PROPELLER REMOVAL In order to remove the propeller you must first
remove the spinner and nut. Be sure only to pull from outside the hub (figure
9). If the surfaces on the hub are hit or dinged it can effect the performance of
THREE BLADE CLASSIC
no! Fig.9 yes
8) WARNING It is important to follow the instruction below carefully so as to
avoid a shock to the gears on the blades and cone gear, that could be
damaging to the teeth.
1) When going from forward to reverse and the opposite, it is necessary to
idle down and shift at low RPM's between gears.
2) The propeller body must always be completely filled with a very fluid
grease. This is so when you reverse direction the rotation will be smooth
with no binding. Binding points will produce a shock and could damage 12532 Beverly Park Rd
the gears. Lynnwood, WA 98087
Office (425) 355-3669
Fax (425) 355-3661
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