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    by marky πŸ‡¬πŸ‡§ ( Lieutenant Commander)
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    15 Posts 14 Replies 0 Photos 19 Likes
    ( Newest Posts Shown First )
    figtree7nts
    Rear Admiral
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    Country: πŸ‡ΊπŸ‡Έ United States
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    Hi Marky,

    Congrat's on the promotion!

    Cheers, Ed
    2
    "Fair winds calm Seas" 73's
    Rookysailor
    Lieutenant
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    Country: πŸ‡¬πŸ‡§ United Kingdom
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    Well done on your promotion Lt. Cmdr Marky,
    doesn't time fly⏲

    cheers, Peter (Rooky)
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    marky
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    Thank you all for all the help about the prop shafts and motor ,will have a look online for the aforementioned.Also thanks congrats on th the promotion never noticed until the congratulations started coming through πŸ‘
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    marky
    Lieutenant Commander
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    Doug wouldn't even know the price ofUnions today ,do remember getting 3d pocket money ,ah the Good old days😏
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    Martin555
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    Extremely well done Marky on your promotion.
    Keep it up.

    Martin555.
    If it looks right it probably is.
    Ianh
    Petty Officer 2nd Class
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    Country: πŸ‡ΏπŸ‡¦ South Africa
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    Guys
    Just remember speed and torque are related. The lower the speed the greater the torque, If you add a gearbox/gearing he actual torque is multiplied by the ratio,

    Formula kW x 9550 sum divided by speed =actual torque in Nm
    Only old in years not mind or soul.
    Nerys
    Commander
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    Mark, May I add my congratulations to you on attaining the dizzy rank of Lieut.Cdr. Well done.

    Nerys
    1
    When the winds before the rain, soon you may make sail again, but when the rain's before the wind, tops'l sheets and halyards mind
    RNinMunich
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    Country: πŸ‡©πŸ‡ͺ Germany
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    Congrats on your promotion Lt. Cmdr Marky πŸ‘
    😎
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    Young at heart - slightly older in other places πŸ˜‰ Cheers Doug
    Nerys
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    Yes Mark, I did have an interesting childhood. Trips to sea every few weeks, One of my earliest memories, I must have been just two. Was my father carrying me down a steep ladder on the side of a ship. I was wrapped in an eiderdown, it was January, My mother standing on the quayside screaming at my father that I was sliding through the eiderdown. We reached the quayside just in time evidently. That was in Newport docks.

    Cheers,
    Nerys
    2
    When the winds before the rain, soon you may make sail again, but when the rain's before the wind, tops'l sheets and halyards mind
    RNinMunich
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    Seriously though folks😁
    Marky,
    there are dozens (hundreds?) of variations on the 540/545/550 theme πŸ€”
    I have a pair of original standard ancient Mabuchi 540s in my 1.35m destroyer and she goes like stink on 6 to 12V. Makes a lot of RTR plastic "speed boats" look downright daft😊
    Once upon a time the 545 was simply a 5 pole version of the cheap n cheerful 540, which gave smoother starting and better low speed control and torque.
    Nowadays there seem to be endless variations of both 540 and 545☹️
    Very generally speaking the 540s seem to be higher revving and the 545s seem to have more torque. So look at the specs / price before you buy!
    More important is the size, displacement (hull type) and probable weight of the boat you want to shove around.
    For a tramp steamer obviously a displacement hull designed to carry weight so I would go for a low revving high torque version.
    Re shaft and prop; again hull type, size and weight of the boat are important factors.
    More so than the length of the shaft.
    In my 52cm fish cutter I am using a 3mm shaft and a 30mm prop.
    Much bigger / heavier than that (or higher revving motor) I would use a 4mm shaft
    I have some 1.5m warships where the load is shared by 3 or 4 shafts so they also have 3mm shafts and 30 or 35mm props. Shafts are also about 10 to 12" (25 to 30cm)
    What size prop is stated on your drawing?
    The larger your prop and the more power you are putting into it the more robust (thicker) the shaft will need to be.
    My 24" Sea Scout, with a powerful brushless motor and about 260mm shaft has a 4mm diameter shaft and 35mm prop.
    Cheers, Doug😎
    PS Another example folks of where not all the necessary info is given to enable a definitive answer!
    1
    Young at heart - slightly older in other places πŸ˜‰ Cheers Doug
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