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    Followers
    The Numbers game for props.
    by garyp ๐Ÿ‡ฌ๐Ÿ‡ง ( Petty Officer 2nd Class)
    ๐Ÿ“ฃ










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    13 Posts 12 Replies 0 Photos 14 Likes
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    Martin555
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    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 5 months ago
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    Thank's Bill just looking around.

    Martin555.
    If it looks right it probably is.
    Scratchbuilder
    Captain
    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 3 months ago
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    Hi Martin.
    Great to see you back on the site.
    Like you I donโ€™t drop in that often now for various reasons,but itโ€™s great to see the site thriving.
    Take care and stay safe,and itโ€™s good to keep in touch in the real world ๐Ÿ˜€
    Regards
    Bill.
    1
    Never give up.It will come right in the end.
    RNinMunich
    Fleet Admiral
    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
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    Hi Martin,
    I think you are dead right (saw it on MB Mayhem I suspect๐Ÿ˜‰).
    I've been looking at a few boat prop suppliers.
    X seems to indicate that both leading and trailing edges of the blades are straight so the plan view looks like an X. Same for aircraft props (sorry - Airscrews๐Ÿ˜) apparently.
    An S type has a curve leading edge and straight trailing edge, just many 3 blade scale props so the plan view is (you guessed it๐Ÿ‘) S shaped.
    Pitch doesn't seem to have much to do with it. S types can also be fine pitch (~1.3) like this example -
    https://www.modellbau-berlinski.de/rc-boats-and-accessories/...
    60/45=1.33r. I've also seen some S with 1.6 pitch, yer pays yer money .....
    From Roy's comment re angular props I'd guess that the X types are are the surface piercing.
    Cheers, Doug ๐Ÿ˜Ž
    https://www.modellbau-berlinski.de/rc-boats-and-accessories/model-boat-propellers/plastic/marine-propeller-2-blade-45mm-right-m4
    ๐Ÿ”—
    1
    Young at heart ๐Ÿ˜‰ Slightly older in other places.๐Ÿ˜Š Cheers Doug
    Martin555
    Fleet Admiral
    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    Hi Roy,
    Here is another one to through into the mix LOL!!
    I have seen it somewhere that a propeller viewed from behind that the 'X' propeller is 'X' shaped and an 'S' propeller is 'S' shaped.

    Martin555.
    2
    If it looks right it probably is.
    roycv
    Midshipman
    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    Hi Martin I know that the plastic and nylon props were labelled P for I think 1.3 pitch to prop diameter and the X ones at 1.7.
    Maybe S stands for surface piercing? They tend to be very angular props and perhaps a bit bigger diameter. Just surmise on the S.
    Roy
    1
    Martin555
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    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    Hi garyp,

    RE the S on your prop.
    I only come across an 'X' or an 'S' on model props and the only explanation i can find is "X" prop is a surface piercing prop.
    S props generally speaking have more pitch.

    I am sure that someone here could shed more light in this subject.

    Martin555.
    1
    If it looks right it probably is.
    garyp
    Petty Officer 2nd Class
    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 15 days ago
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    I have just ordered a new brass prop.. M4 40MM.
    I guess the M4 is thread and the 40 MM the prop diameter. Any help? Please..
    On the replacement plastic prop package it is replacing it says
    M4 40S
    1
    Gary Pressman
    garyp
    Petty Officer 2nd Class
    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    Thank you sir.
    Gary Pressman
    GregHiltz
    Master Seaman
    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡จ๐Ÿ‡ฆ Canada
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    4mm shaft diameter, 35mm prop diameter.
    garyp
    Petty Officer 2nd Class
    ๐Ÿ“ The Numbers game for props.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
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    Thank you .That is great advice..
    Gary Pressman
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