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    Unwinding Propshaft ?
    12 Posts ยท 9 Followers ยท 4 Photos ยท 42 Likes
    Began 12 months ago by
    Leading Seaman
    United Kingdom
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    Latest Post 12 months ago by
    Leading Seaman
    United Kingdom
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    jonb
    Leading Seaman
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Unwinding Propshaft ?
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    Hi Everyone
    Thanks again for all your good advice...much appreciated.

    Think I will look into a collar for the prop shaft...I did cut up an old m3 prop and extended it into a 2 piece (see pic) and that seemed to stop the shaft unwinding. I hadn't realised it needed a buffer to stop this.(should've paid more attention in the science lesson)

    I'll post the results after the new collar is fitted

    Best wishes
    Jon
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    oddjob58
    Leading Seaman
    ๐Ÿ‡ฆ๐Ÿ‡บ Australia
    ๐Ÿ“ Unwinding Propshaft ?
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    You could simply use some locktite or plain old PVA glue will stop it from unwinding.
    dave976
    Captain
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Unwinding Propshaft ?
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    Hi Jon
    Whoever fitted the propshaft got it wrong. As Lew says you need a proptube with bearings to carry the propshaft which should be long enough to allow for the prop, locknut and thrust washer at one end and a thrust washer, lock nut and connector at the other end. There should be a small amount of play between the thrust washers and the proptube bearings.
    This set up takes all the forces from the prop in either direction and prevents any force on the coupling or motor.
    If you don't want to reduce the propshaft length then a lockable collar and thrust washer at the motor end as Nick says will also work. You also need to fully engage the splines in the U/j fitting, moving the motor and realigning if necessary.
    dave976
    Nickthesteam
    Commander
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Unwinding Propshaft ?
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    Totally agree with flaxybuck, a locking collar is the way to go, but dont forget the clearence, around 15 to 20 thou.

    https://www.ebay.co.uk/itm/325238150916?mkcid=16&mkevt=1&mkrid=711-127632-2357-0
    If it don't fit, use a hammer to make it fit....
    LewZ
    Commodore
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Unwinding Propshaft ?
    51 Views ยท 6 Likes
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    Second though after looking closer at the photos. What is restricting the rearward movement of the shaft into the stuffing box? It is hard to tell in the photos.

    When the boat is going forward the force on the prop forces the shaft forward. When in reverse the prop is pulling the shaft aft ward. Sounds like our problem.

    It looks like you need a collar (with setscrew) that keeps the shaft from working rearward.

    Lew
    Florida, USA
    Lew Zee (LewsModelBoats.org)
    jonb
    Leading Seaman
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Unwinding Propshaft ?
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    Thanks Everyone
    All very helpful replies, I will work my way through them.

    Am I right in thinking that if the locking nut is up against something solid, it can not physically move and therefore remains in situ .
    So, if I infilled the gap between the now end of the outer shaft and locking nut ( cut a length of old prop ) this might work as well.
    Best wishes everyone

    Jon
    LewZ
    Commodore
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Unwinding Propshaft ?
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    Make sure the lock washer has some springy give to it so that it functions right. You might try a wider nut so more surface area is against the lock washer, maybe add a second nut (jamb).
    Lew
    Florida, USA ๐Ÿ‡บ๐Ÿ‡ธ
    Lew Zee (LewsModelBoats.org)
    BarryS
    Warrant Officer
    ๐Ÿ‡บ๐Ÿ‡ธ United States
    ๐Ÿ“ Unwinding Propshaft ?
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    Hi Jon
    If I were to venture a guess, it would be that the spline fit is a little too loose.
    When in reverse the prop thrust is trying to pull the spline connection apart. If there is the slightest amount of play in the spline connection it will "wiggle" itself apart.
    The easy solution is to use a thread loc adhesive on the spline joint.
    If there is too much play in the connection it will need to be drilled and tapped for a gib screw.
    Barry
    flaxbybuck
    Captain
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Unwinding Propshaft ?
    57 Views ยท 5 Likes
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    It looks to me as though you have no locking collar on the prop shaft. This should be placed on the shaft up against the end of the prop tube leaving say 0.5mm clearance.
    Good luck๐Ÿ˜‰
    jonb
    Leading Seaman
    ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    ๐Ÿ“ Unwinding Propshaft ?
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    Hi Terry
    Thank you for your thoughts, I'll have invest in a dog drive ...its a conversion from glow to electric, the outer prop shaft was set when I purchased the already started kit, which I don't really want to rip out .
    So, if I infill the inner shaft up to the outer shaft ending, it might work!!
    Appreciate your time and help
    Regards Jon
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