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Pyi Max Prop 3 Blade Instructions



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                                      1)                                  INTRODUCTION: Thank you for having chosen a Max-Prop automatic


max-prop
                                                                         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
                                                                        boat.
 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
                                                                           angle.
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

                                                                                                                        Fig.1

             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

                www.pyiinc.com
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).
3
3
                                                                                                                                       yes                          no!


                                                                                                                          4
                                                                                                                          5


                                                                                          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).

                                                                                                                                                                         x
                                                                                                                                                                         (-)
                                                                                                                                                                   30   H




                                                                                                                                                  Right Rotation
                                             Fig.2                                                                                                                 28   D
                                                                                                                                                                   26   V
                                                                                                                                                                   24   S
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
                                                                                                                                 x                                 22
                                                                                                                                                                   20
                                                                                                                                                                   18
                                                                                                                                                                         N
                                                                                                                                                                         K
                                                                                                                                                                         E
   shaft where the hub stops on the shaft. Re-insert the key and slide the hub                                                                                     16   C
                                                                                                                                                                   14   T
   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
                                                                                                                                                                   10   H




                                                                                                                                                  Left Rotation
B) Two types of nuts are available in the Max-prop:                                                                                                                12   D
                                                                                                                                                                   14   B
                                                                                                                                                                   16   S
     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
                                                                                                                                                                   24   C
                                                                                                                                                                   26   A
                                                                                                                               Fig.3                               28   P
                                                                                                                                                                   30   L
                                                                                          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
   grease.

                                                                                        Y
                                                                                        (-)
                                                                                  30   H




                                                                 Right Rotation
                                                                                  28   K
                                                                                  26   B
                                                                                  24   C
                                                                                  22   D
                                                                                  20   E
                                                                                  18   H
                                                                                  16   K
                                                                                  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.
                                                                                   0   D
                                                                                  10   D     G) Move the blades to a feathered position, making sure that the rounded
                                             Y
                                                                 Left Rotation
                                                                                  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
                                                                                  16   A
                         CBA
                 K




                                                                                                 blades and spinner match. Next tighten down the end cap with the screws.
                                                                                  18   B
                                                                                  20   C          NOTE: Check to see that the spinner did not rotate. If it did move pull the
                                                                                  22   D
                                                                                                   blades back 1/4" and then realign the mark between the spinner and the
                                                                                  24   E
                                                                                                   hub. Make sure that when the blades go on to the spinner that they are fully
                                                                                  26   H
                                         Fig.4                                    28   A          feathered.
                                                                                  30   B
                                                                                              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
                                                                                                   apart.




       MARK                                                                                                                                Fig.5
                                                                                                     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"
                                                         B                               grease.

                                                                                           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.
                                                         A


                      Fig.8
     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


                                                                                         max-prop
  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
                                                                                         Installation Instructions
     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
     the propeller.
                                                                                         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
                                                                                                        Email: Info@pyiinc.com
                                                                                                           www.pyiinc.com


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