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Beta 1505 (38) with PRM transmission and 16" 3 blade max prop

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  • June 06, 2011 10:33 AM
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    Message # 614222
    Anonymous member
    Does anyone else have this configuration? I'm wondering what you have the pitch set at on the max prop.
    Thanks
  • June 06, 2011 1:16 PM
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    Reply # 614386 on 614222
    Anonymous member
    I do.  Give me a couple of days to find where I documented it and I'll send the answer.
  • June 06, 2011 1:24 PM
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    Reply # 614394 on 614222
    Anonymous member
    Great! Thanks Dick
  • June 06, 2011 6:40 PM
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    Reply # 614675 on 614222
    Anonymous member

    My records show that with the Beta 38 and a 2.5 to 1 reduction transmission the Maxprop set at 28 degrees or 16" pitch (X=D and Y=K), one boat got 6 knots at 1800 RPM.

    Another owner in San Francisco set his at 26 degrees (X=V and Y=B), although I do not have any data from him regarding performance.

    If you have a 2 to 1 reduction, then the prop should be set to a lower degree, such as about 20 or 22 degrees.
  • June 07, 2011 6:46 AM
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    Reply # 615007 on 614222
    Anonymous member
    OK so now I'm really confused. 

    Dick has his set at 20 degrees or 11" pitch X=K Y=E
     
    From Bud, 28 degrees or 16" pitch X=D and Y=K

    From Max-prop, 24 degrees or 13.4" pitch  X=S Y=C

    I also have the 2.5:1 tranny ratio Bud
  • June 08, 2011 4:35 PM
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    Reply # 616463 on 614222
    Anonymous member
    You're like the man with two watches.  Now he doesn't know the time.

    My notes show that Bud Taplin recommended 18 degrees for me.  I also talked with the Maxprop guy at PYC.  He said 20.  18-20 are pretty much the same answer.

    I do get full RPM at full throttle.   I certainly do not get 6 knots at 1800 RPM.  With a very clean hull and a polished prop I get 5 knots.  With only a month's fouling I get only 4.5 knots at 1800.

    It you do use 26 or 28 degrees, and you do get 6 knots, please let me know.  I'll switch.




  • June 08, 2011 5:50 PM
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    Reply # 616514 on 614222
    Anonymous member
    Dick, what is your tranny ratio? If you look at the tranny from the top there is a brass plate. At the bottom of the plate is a number that starts with 120... the last 3 digits are the ratio... mine says 250.
    Last modified: June 08, 2011 5:51 PM | Anonymous member
  • June 09, 2011 5:54 AM
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    Reply # 616803 on 614222
    Anonymous member
    My plate says 120D2

    I guess that means mine is a 2.0 ratio and yours is 2.5.

    It's oversimplification but if I set my pitch at 20 degrees it is equivalent to 25 degrees with your ratio.  Do I interpret that right?

    Sorry for the confusion.  These questions come at a time when I'm underway every day and it's hard to access stuff.
  • June 09, 2011 7:05 AM
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    Reply # 616842 on 614222
    Anonymous member
    Dick - there is a number after the 120D2 ... the 120D2 is the PRM model number.
    Mine is 120D2-250

    Thanks a ton for the help.
  • June 10, 2011 4:40 AM
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    Reply # 617946 on 614222
    Anonymous member

    That is a picture of my tranny name plate
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