Max Prop

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COLOR="#6666FF" FACE="Arial" > |   </FONT>H<A HREF="index.htm" TARGET="_top" TITLE="Hylas 54 Specifications"><U><B>ome</B></U></A><B>                                  </B></div> <div> back to  <A HREF="propulsion.htm" TARGET="_top" TITLE="Propulsion"><U><B>Propulsion</B></U></A></div> <div> <IMG SRC="13af4010.png" border=0 width="500" height="1" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <DIV ALIGN="LEFT"></DIV> <div> <B>Max Prop</B></div> <div> <A HREF="shaft.htm" TARGET="_top" TITLE="PYI Shaft Seal"><U><B>PYI Shaft Seal</B></U></A><B>   |   </B><B>Max Prop</B><B>   |   </B><A HREF="thruster.htm" TARGET="_top" TITLE="Bow Thruster"><U><B>Bow Thruster</B></U></A><B>   |   </B><A HREF="fuel.htm" TARGET="_top" TITLE="Fuel System"><U><B>Fuel System</B></U></A><B>   |   </B><A HREF="oil.htm" TARGET="_top" TITLE="Oil Polishing System"><U><B>Oil Polishing System</B></U></A><B>   |   </B><A HREF="yanmar125.htm" TARGET="_top" TITLE="Yanmar 125 HP"><U><B>Yanmar 125 HP</B></U></A><B>   |   </B><A HREF="shaftlock.htm" TARGET="_top" TITLE="Shaft Lock"><U><B>Shaft Lock</B></U></A></div> <bR> <bR> <bR> <bR> <bR> <div> <B>MAX Prop VP</B></div> <bR> <div> <IMG SRC="11ce2c370.png" border=0 width="300" height="55" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <bR> <bR> <bR> <bR> <div> <TABLE BORDER="0" CELLPADDING="1" CELLSPACING="1" WIDTH="480" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="VOID" RULES="NONE" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 20 WIDTH="476"><div> <B>Max. Prop (VIP 3 blade) variable pitch</B></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 ><NOBR><div> <B>83mm hub - standard, SAE Taper, Shaft Diameter  1 3/4", 1:16</B></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 20 ><NOBR><div> <B>Taper (small 1.437", max. 1.439"), Taper length 5", 1.25 thread,</B></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 1547 WIDTH="476"><div> <B>width 7 threads per inch, Propeller diameter 21"</B></div> <bR> <div> <B>Prop Zinc Internal Hub Diameter 415 MM, 610 MM length, and 815 MM width</B></div> <bR> <bR> <DIV ALIGN="LEFT"></DIV> <div> PYI  Kevin Woodey, President; Phil, Sales; Chuck Technical; 800 523-7558</div> <bR> <div> <A HREF="http://www.dakare.com/HylasSpecs/id1109_m.htm" TARGET="_top" TITLE="http://www.dakare.com/HylasSpecs/id1109_"><U><B>Untitle</B></U></A><B><IMG SRC="29afcdee0.png" border=0 width="205" height="238" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></B></div> <bR> <div> <B>Experiences and Findings with the Max Prop</B></div> <bR> <div> <B>1) Used with a Yanmar 125 HP Japanese Hurth knock-off transmission as supplied by Hylas, one will need to install a Prop Brake.  The good news is that Yanmar has agreed to provide this as a warranty claim and there is a promise to preinstall this device on all future Hylas 54's that come with a Yanmar 125HP (4jh3-DTE) engine.</B></div> <bR> <div> <B>2)  There has been a massive recall by Max Prop for all VP props built when ours was provided.  The adjustment retainer ring must be replaced.  We sent ours in to be replaced and this prcoess will take about 3 weeks.</B></div> <bR> <div> <FONT SIZE="2" COLOR="#330099" FACE="Arial" ><B>3) When one puts the boat in gear at low RPM's when the boat was first comissioned, a rattling noise was heard.  This noise disappears at higher RPM.  Max Prop indicates that this can be expected and is the result of the Damping Plate.  This is unclear and will be further detailed once the prop is received back from Max Prop.  Below are the findings from PYI.</B></FONT><B> <A NAME="pyi_findings_2"><IMG BORDER="0" SRC="1x1.gif" HEIGHT="1" ALIGN="bottom" WIDTH="1" HSPACE="0" VSPACE="0" ></A></B></div> <bR> <DIV ALIGN="LEFT"></DIV> <div> <TABLE BORDER="2" CELLPADDING="2" CELLSPACING="1" WIDTH="345" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 368 WIDTH="333"><div> Following are our findings:<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> 1) <U>Modified VP Mechanism</U>: Replaced existing internal stop and added two more<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> Replaced existing set screw in base of hub and added two more<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> Replaced existing internal pin and added two more<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> This modification increases the strength and durability of the variable pitch mechanism and is done at no charge.<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> 2) <U>General Reconditioning:</U> Balance propeller at 20 degrees<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> Sandblast and polish externally<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> Light cleanup of internals<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> Blades were found to be twisted so they were straightened<FONT SIZE="3" COLOR="#FFFFCC" FACE="Arial" > </FONT></div> <div> 3) We checked the gearing mechanism and teeth and they were in great shape. We also checked to make sure the hub was sitting on the shaft properly and there was no indication that the hub was loose or wasnt sitting properly.</div> <bR> </tD> </tR> </TABLE></div> <bR> <div> <B>4)Max Prop indicates that the 2.45 : 1 transmission ratio is the proper sized ratio for a Hylas 54 with a 125HP engine and a 21 inch blade.  The recommended prop pitch is 20 degrees (this appears to be one setting to high - see below).  With that, our engine was able to achieve 3800 RPMs at full throttle measured at the Yanmar Tach.  According to one Yamnar rep, each degree of prop pitch should provide a 7.5% increase or decrease in engine RPM depending on which way you go in adjusting the pitch.  Another heuristic we were given by the Yanmar rep in Trinidad is that by increasing or decreasing the blade setting angle one notch (2 degrees) will have the corresponding impact on the engine RPM amounting to about 400 RPM / 2 degree change.  The two heuristics above defy correlation.  All mesurements should be done at the fly wheel to avoid errors associated with the Yanmar Tach (See next point).</B></div> <bR> <div> <B>5) Another finding according to the Trinidad Yanmar Rep was that the Yanmar tachometer reads about 200 RPM slower than actual speed.  </B></div> <bR> <div> <B>6) The full throttle, no-load RPMs was adjusted 10/2002 under warranty to 4500RPMs by Trintrac.</B></div> <bR> <DIV ALIGN="LEFT"></DIV> <div> <TABLE BORDER="2" CELLPADDING="2" CELLSPACING="1" WIDTH="226" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" BGCOLOR=#0000CC > <tR> <tD VALIGN=TOP HEIGHT= 48 WIDTH="109"><div> <B>Blade Setting Angle</B></div> </tD> <tD VALIGN=TOP WIDTH="98"><div> <B>RPMs </B><FONT SIZE="1" COLOR="#FFFFCC" FACE="Arial" ><B>Measured at Fly Wheel</B></FONT></div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="109"><div> 20 Degrees</div> </tD> <tD VALIGN=TOP WIDTH="98"><div> 3640</div> </tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 16 WIDTH="109"><div> 18 Degrees</div> </tD> <tD VALIGN=TOP WIDTH="98"><div> 4000</div> </tD> </tR> </TABLE></div> <bR> </tD> </tR> </TABLE></div> <bR> <div> <IMG SRC="29b000bc0.png" border=0 width="256" height="188" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <bR> <div> <TABLE BORDER="0" CELLPADDING="2" CELLSPACING="1" WIDTH="424" BORDERCOLORLIGHT="#C0C0C0" BORDERCOLORDARK="#808080" FRAME="BOX" RULES="ALL" HSPACE="0" VSPACE="0" > <tR> <tD VALIGN=TOP HEIGHT= 224 WIDTH="229"><div> <B>Under Sail</B></div> <div> The Max-Prop Feathers to a low drag shape. Compared to a </div> <div> folding propeller the Max-Prop will have similar drag. The extra wetted surface of the Max-Prop blades is offset by the reduction of projected area: A.</div> <bR> <bR> <bR> <bR> </tD> <tD VALIGN=TOP><NOBR><div> <IMG SRC="11cfaf6c0.png" border=0 width="175" height="108" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 263 WIDTH="229"><div> <B>In Forward</B></div> <div> The torque of the prop shaft acting on a "differential" type design will open the blades in unison to the preset pitch at any throttle setting. This will provide maximum efficiency (96% of same sized fixed prop) plus eliminates the vibration problems of a folding prop.</div> <bR> <bR> <bR> <bR> </tD> <tD VALIGN=TOP><NOBR><div> <IMG SRC="11d0b3650.png" border=0 width="179" height="101" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> <tR> <tD VALIGN=TOP HEIGHT= 191 WIDTH="229"><div> <B>In Reverse</B></div> <div> As in forward, the torque of the shaft will rotate the blades 180 degrees in less than 3/4 of a shaft rotation, presenting the same leading edge and pitch in reverse. This provides better directional control and 80% greater power that a comparable fixed blade propeller.</div> </tD> <tD VALIGN=TOP><NOBR><div> <IMG SRC="11d1b4600.png" border=0 width="180" height="96" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> </NOBR></tD> </tR> </TABLE></div> <bR> </td> </tr></table></body>