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Thread: Propeller talk post

  1. #1
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    Default Propeller talk post

    OK guys I will add stuff to this post as we go along, I'm ignoring any questions of what prop do I need on my set up,, For argument sake All model boat props were 2 blades in the 80's so when you wanted a 2 blade prop you asked for a 440-450-460-470- ect,,, now when the 3 blades came out or got discovered back then they became 440/3-450/3-460/3-470/3 ect,lets all get on the same page

  2. #2
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    What's your preferred method to describe an ABC prop (1715 for example) in terms of the rake angle and blade area, 1715 17-45?
    Vac-U-Tug Jr (13mph)

  3. #3
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    Why not use the manufacturer’s designation: 1715-17-45(2) CLL?
    ERROR 403 - This is not the page you are looking for


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    Quote Originally Posted by fweasel View Post
    What's your preferred method to describe an ABC prop (1715 for example) in terms of the rake angle and blade area, 1715 17-45?
    1715 I'm assuming 2 blade 17* unless told 1715/3 but now with all the new ABC props I need to be careful

  5. #5
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    17 is the diameter 15 is the pitch angle. if you multiply 17 times 15 it equals 2.55” of total pitch. For every turn the boat travels 2.55”. There is slip. Can’t be much simpler.


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  6. #6
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    Cool

    The problem is how to ask for the exact ABC prop you want.

    diameter - pitch ratio - rake - blade area - number of blades - chopper/cleaver - left or right hand

    Use the maker’s prop designation. Can’t be any simpler - if you want to identify a specific ABC prop.



    .
    ERROR 403 - This is not the page you are looking for


  7. #7
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    2017 ABC prop chart
    Attached Files Attached Files

  8. #8
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    I had trouble where I asked for props he hasn't even designed yet. Like I wanted something in particular that doesn't exist. That'll learn' me! Check the danged chart.
    Noisy person

  9. #9
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    Very easy

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    good Visual the 10* is a lifter it lifts the transom and as it does that it lowers the bow as the rakes get higher there is less transom lift

  11. #11
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    Quote Originally Posted by dasboata View Post
    good Visual the 10* is a lifter it lifts the transom and as it does that it lowers the bow as the rakes get higher there is less transom lift
    Cool, I didn't know the relationship between rake and lift. Does the rake angle change the thrust cone too?
    Vac-U-Tug Jr (13mph)

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    Quote Originally Posted by fweasel View Post
    Cool, I didn't know the relationship between rake and lift. Does the rake angle change the thrust cone too?
    yes Ryan you can visualize the thrust will be tighter on the higher rake props

  13. #13
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    Quote Originally Posted by dasboata View Post
    yes Ryan you can visualize the thrust will be tighter on the higher rake props
    Ok, makes sense. Does a narrower thrust cone mean less forward propulsion? Does a narrow vs. wide cone matter when considering a boat that turns vs. SAW?
    Vac-U-Tug Jr (13mph)

  14. #14
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    Quote Originally Posted by fweasel View Post
    Ok, makes sense. Does a narrower thrust cone mean less forward propulsion? Does a narrow vs. wide cone matter when considering a boat that turns vs. SAW?
    common sense says yes,, tighter thrust cone more thrust , I don't think the turns matter if your using a strong enough servo

  15. #15
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    [QUOTE=Alfa Spirit;735707]Hummm ...


    [IMG]ht


    this is not show and tell please remove your post this is a informative contributions subject

  16. #16
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    This is an informative contribution picture

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    How big would the hub have to be to be able to balance a 45mm single bladed prop?

    Do you think it would be an advantage, or would the extra size and weight of the bigger hub more than counteract the extra efficiency of the bigger blade running in cleaner water?
    Paul "tug Killer" Upton-Taylor, Cat lover.
    FastElectricBoats.co.uk

  18. #18
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    Quote Originally Posted by NativePaul View Post
    How big would the hub have to be to be able to balance a 45mm single bladed prop?

    Do you think it would be an advantage, or would the extra size and weight of the bigger hub more than counteract the extra efficiency of the bigger blade running in cleaner water?
    never thought about it as it a waste of time for me as someone would of done it already

  19. #19
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    Quote Originally Posted by NativePaul View Post
    How big would the hub have to be to be able to balance a 45mm single bladed prop?

    Do you think it would be an advantage, or would the extra size and weight of the bigger hub more than counteract the extra efficiency of the bigger blade running in cleaner water?
    Fairly large. Probably need to use small tungsten slugs. We did it with pylon racing props, but they were compression molded carbon fiber.
    Brian "Snowman" Buaas
    Team Castle Creations
    NAMBA FE Chairman

  20. #20
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    Quote Originally Posted by NativePaul View Post
    How big would the hub have to be to be able to balance a 45mm single bladed prop?

    Do you think it would be an advantage, or would the extra size and weight of the bigger hub more than counteract the extra efficiency of the bigger blade running in cleaner water?
    I've made a few. The hubs are not round, but when rotating the net Hub area is around 1/2" or slightly bigger. They do work, but I didn't see any huge revelation.
    Obviously balance is the key and difficult to achieve. A novelty for sure.

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