New homemade bullet outboard

Discussie in 'Speedboten' gestart door Dim L, 10 sep 2022.

  1. Dim L

    Dim L

    Lid geworden:
    18 aug 2021
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    Goodmorning rc friends!
    I applied a first layer of putty and epoxy primer on the leg of the outboard, I secured the aluminum parts with thicken epoxy + screws and bolts and lastly I glued a carbon plate to hold the water inlets. A 85% of the work has been done.:)

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  2. Tamiya1970

    Tamiya1970

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    31 mrt 2012
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    I really like your design.
    And make me want to build one myself.
    I specially like the flex shaft angle .
    Must be way more forgiving then my k&b 7.5.
    Wo tents to eat flex shafts with the 4082 1520 kv motor mounted.
    I think I go order a nice piece of carbon fiber sheet and try to build one to.
    Keep us posted with your progress.
     
    Dirk Jan en Dim L vinden dit leuk.
  3. Dim L

    Dim L

    Lid geworden:
    18 aug 2021
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    Thank you very much Alex!
    Indeed, this outboard has even larger angle (~ 115 degrees) than my previous one (~113) and the reason is exactly to protect the flex shaft and increase efficiency.
    The "plans" are available in previous posts so you can get ideas.
    The critical point in this construction is to glue the turn fin, the brass tubes, the carbon fiber plates and the U shaped aluminum in a straight line.
    All other parts are relatively straightforward.
     
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  4. Dirk Jan

    Dirk Jan Forum veteraan

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    Yes, really good looking! What thickness of carbon plate did you use?

    And how will you mount the motor to the leg?

    Regarding the flex shaft angle, I think for the life time, it is more about the radius of the bend than the total wrap angle.
    Let's say, the radius of the bend is 100mm, it does not really matter if the wrap angle of the shaft is 45 degrees or 180 degrees.
    In other words; it is really important to use a nice continuous bend.

    For the flex shaft resistance, the total (wrap) angle reduction will also help.
     
    Tamiya1970 en Dim L vinden dit leuk.
  5. Dim L

    Dim L

    Lid geworden:
    18 aug 2021
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    Thank you Jan!
    I use 2 mm cf plates which is strong enough and easy to cut. If necessary I glue two parts with epoxy to make a 4mm plate.

    The motor will be mounted using a 4mm cf plate which will be screwed with 4mm screws exactly where the arrows show
    IMG_20221101_214521.jpg

    This makes sense Jan for sure. However, given the limitations to the size of the outboard, and consequently the length of the radius, wouldn't be better to have a larger wrap angle?
     
  6. Dim L

    Dim L

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    18 aug 2021
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    Laatst bewerkt: 2 nov 2022
    Dirk Jan vindt dit leuk.
  7. Dirk Jan

    Dirk Jan Forum veteraan

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    That is a really nice design, because it uses a strut, like hydro's. This way, it is easy to access the prop shaft.
    The look is not scale, but you will not see that when your boat passes with 80+ km/h
     
  8. Dim L

    Dim L

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    Hahaha yes sure! We will probably get more satisfaction with a 80Km/h pass than a scale look!!!!
     
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  9. Dim L

    Dim L

    Lid geworden:
    18 aug 2021
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    Yes and is also relatively easy to build, since the most difficult part of the construction, the strut, is readily available if you do not wish to build it!
     
    Dirk Jan vindt dit leuk.
  10. Dim L

    Dim L

    Lid geworden:
    18 aug 2021
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    888
    Locatie:
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    Finally I got my motor :thumbsup:. It seems well built and I think it suits nicely on the O/B...
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  11. Tamiya1970

    Tamiya1970

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    Nice motor ,Dim
     
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  12. Dim L

    Dim L

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    Thanks Alex!
     
    Tamiya1970 vindt dit leuk.
  13. Dirk Jan

    Dirk Jan Forum veteraan

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    Nice! I see really good speeds with the Rocket motors on YouTube.
    It will suit the outboard nicely. Perfect for 4S, or a hot setup for 5S.

    By the way, I collected all parts to make my own DIY outboard as well. I hope to start it somewhere next year
     
    Tamiya1970, Unusual RC en Dim L vinden dit leuk.
  14. Dim L

    Dim L

    Lid geworden:
    18 aug 2021
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    Locatie:
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    Thanks Jan :thumbsup:!
    I have a 5S (previously a 6S but I removed one of the cells because it was inflated) and I want to try it first :D.
    Perfect! It will the first diy "insane style" O/B. I believe one of the main advantages of thwlis setup will be its low weight.
     
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  15. Dim L

    Dim L

    Lid geworden:
    18 aug 2021
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    888
    Locatie:
    Athens, Greece
    Goodmorning rc friends.
    The motor is mounted on the o/b. Everything seems to be OK for now.
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    Unusual RC, Tamiya1970 en Dirk Jan vinden dit leuk.
  16. Tamiya1970

    Tamiya1970

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    31 mrt 2012
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    Looks good ,and it seems to bee well mounted with 6 bolts
    It sure looks slick !
     
    Dim L vindt dit leuk.
  17. Dim L

    Dim L

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    18 aug 2021
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    Thanks Alex ! The motor will not move that's for sure!;)
     
  18. Unusual RC

    Unusual RC

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    Looks awesome!
    Where did you buy this outboard ;)
     
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  19. Dim L

    Dim L

    Lid geworden:
    18 aug 2021
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    Haha ...thanks Michael for your nice words ;)!
     
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  20. Dirk Jan

    Dirk Jan Forum veteraan

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    It looks great I wonder, how did you bend the flex shaft tube? Probably with the teflon liner and the flex shaft inside it? I noticed even with the very shallow bend in the WildThing shaft the tube flattened a bit in the bend.

    I'm looking for a good pipe bending tool for small diameter pipes. I have also seen a spring-sleeve that you slide over the pipe and then bend it. It was sold out unfortunately..
     
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