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Thread: New motor-mount concept. The Boom-prop!

  1. #1
    Cor blimey, guv'nor!
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    New motor-mount concept. The Boom-prop!

    Just wanted to share a new concept and hear people's views. Although it's a simple idea, I've not found evidence of it being used before although I'm sure more proficient Google'rs will show me otherwise. I call it the "Boom-prop" and I'm rather pleased with it.

    The Boom-prop is a motor-mount where the propeller uniquely rotates around a tubular boom. The assembly can be clamped anywhere on the boom, so making adjustments to your CG very easy. i.e. if you add more weight to your plane's nose (batteries/cameras etc), you can just slide the Boom-prop further towards the tail. No need to add dead-weight.

    There's no limit to what size prop you can use. Your prop will never strike the boom, as it rotates around the boom. You can even have cables (from the tail servos or video tx) going THROUGH the centre of your prop, which messes with your head to start with, but is very cool.

    You could have multiple Boom-props on one boom, counter-rotating, or switch between a very large shallow-pitch prop for super-efficient climbing and a much smaller, steeper-pitch prop for efficient cruising.

    It’s been made on a 3D printer (even the 2:1 gears) and it works a dream! It's light weight and since it uses a tooth belt, also VERY quiet and efficient too.

    I'm building a powered glider which uses a 1500mm 12.7mm (1/2 inch) carbon fibre boom from nose to tail.

    You can use whatever motor/prop you want, but currently I'm going with...

    • Turnigy 2217-16T 1050kv (71g) motor
    • 2:1 gear reduction
    • 13 x 8 Aeronaut folding props
    • 14.8V battery, 320 Watts, 21.6 Amps
    • 1850g thrust, 50 MPH pitch-speed (5.8g/W)








    It's much easier to see the parts and assembly if you watch it in HD.
    Last edited by Ian Davidson; 13th May 2013 at 03:34 PM.

  2. #2
    Instructor Pilot
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    I like it bro!
    I have a new design this could work on.
    Lets talk.

  3. #3
    I see you... Derrick's Avatar
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    Very cool, I am not sure that I would trust the 3D printed part to keep the props attached. The concept is great though.
    When nothing else out there will suit your needs... design and build it yourself.

  4. #4
    Cor blimey, guv'nor!
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    Quote Originally Posted by Derrick View Post
    Very cool, I am not sure that I would trust the 3D printed part to keep the props attached. The concept is great though.
    Yes, that was my concern too, but it's absolutely fine.

    I've flown with it, throttle flat-out and pumping the throttle hard to try and induce a failure, but it's solid. They're no slop or vibration either. I couldn't be happier by how it performs.

    I first machined the concept out of aluminium with just a 3D printed spinner, then moved everything to being 3D printed.

    Last edited by Ian Davidson; 12th May 2013 at 05:53 PM.

  5. #5
    Cor blimey, guv'nor!
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    Quote Originally Posted by ritewing View Post
    I like it bro!
    I have a new design this could work on.
    Lets talk.
    Yes, lets chat. I should send you one!

  6. #6
    Instructor Pilot
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    New motor-mount concept. The Boom-prop!

    Very nice Ian... I also have to admire your CNC prototype - you must have quite the Workshop!

    I ask once again, are you interested in adoption?

  7. #7
    Instructor Pilot
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    Yes, lets do!!

  8. #8
    immersed from the start AtariJoe's Avatar
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    Now THATīs an economic drive concept. Canīt wait to see what airframe prototype might be designed around it.
    -LOSers cry wolf when they see SHEEP
    -Why? ...because I can.

  9. #9
    I Like Waffles... SENTRY's Avatar
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    With a low boom - do you have to change the incidence angle of the wing(s) since the thrust-line is below the center-line of the CG? If so - what does this do for airframe efficiency?
    "I Like Waffles" : FPVLab on Facebook and FPVLab on Twitter

  10. #10
    Crashing Vitamin J's Avatar
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    I want. Are you planning on producing these for sale?

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