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Thread: What The??

  1. #1
    Join Date
    Jul 2012
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    Default What The??

    This is an image of my cnc alloy 442 prop. Does anyone have any ideas or insight into the cause of this? Did it hit something or was it just failure from fatigue? Spinning the prop is 1600kv motor on 6s.
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  2. #2
    Join Date
    Aug 2010
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    uk
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    Its a job to say if the blade hit something & failed as there is no other signs of damage on the rest of the prop, what i can tell you is that aluminium props are not very strong compared with bronze or SS props. Especially on high power systems, seen this happen many times with aluminium props with blades tearing off.

  3. #3
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    Looks like straight up metallurgical failure, no signs of an impact.
    Vac-U-Tug Jr (13mph)

  4. #4
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    Feb 2008
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    GB
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    I would guess fatigue, as there is no noticable damage other than the missing bit, not always but often there is damage to both blades with prop strikes.

    What make is it? Aluminium alloys vary in strength a lot. the 7075 Tenshock use and the proprietary alloy blend TP use are a LOT stronger than the typical 6061 many others use, and having worked several for friends I would say they are of similar strength the the stock BeCu used on Octura and ABC.
    Paul "tug Killer" Upton-Taylor, Cat lover.
    FastElectricBoats.co.uk

  5. #5
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    sa
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    Three out of three, with the same diagnosis confirms for me it was a failure. You hear of alloy props failing but this has been a first for any prop for me (usually run octura).

    Prop has no brand markings on it, so unsure of make. Bought from Rc Boat Bitz many years ago with a handful of runs on it.

  6. #6
    Join Date
    Apr 2007
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    ON
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    I wonder if they are cut from billet or cast and then cut?
    Nortavlag Bulc

  7. #7
    Join Date
    Jun 2018
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    ny
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    i would think they would be easier to just cut from a billet, but i may be wrong... the CNC props i have had did not look like cast aluminum, i have a cast aluminum prop for my DV60, was cheap and fast shipping (aka 2 day shipping and $14...LOL and it looks nothing like the CNC prop material even after sharpening, balancing, etc...

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