Hovering Car

Discussion in 'The Projects Forum' started by xoxorockoutloud123, Jun 17, 2013.

  1. xoxorockoutloud123

    Thread Starter New Member

    Jun 17, 2013
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    I am currently working on a hovering car powered by 7 DC fans. There will be 2 on the bottom to provide a lift, and one of the back to provide a forward thrust. The other four are going to be placed on the body, one in each corner, to provide a method of steering. For example, as the top right fan and bottom left fan are turned on, the car will be turned left.

    I want to control all of these 7 fans remotely, either with radio, or IR. I plan to have all of these fans running on a series of 9V batteries. However, my experience with electronics is that I know how to pronounce electricity, and I can barely solder without burning myself.

    Can you guys help me figure out where to even get started? I am clueless about electronics. :confused:
     
  2. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    OH damn I can see this going horribly wrong here....
    What kind of fans are you using and I don't see you using 9v batteries .... Your better off using lithium batteries ...Also how big is this going to be..
     
  3. tubeguy

    Well-Known Member

    Nov 3, 2012
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    Interesting project!
    I'm guessing lift will require the most power. And with battery power, efficiency is important.
    What about 3 or 4 motors for lift and stability, 2 to provide both steering and thrust ?
    You would have a tripod configuration or 4 corners for lift. A reversible motor mounted each side could provide forward/reverse thrust and steering or spin in place, for that matter.
     
    Last edited: Jun 17, 2013
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  4. xoxorockoutloud123

    Thread Starter New Member

    Jun 17, 2013
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    Dr. Killjoy- I plan on making it not too big. Maybe having the base be 8in by 10in. Not sure about height

    Tubeguy- That is a great idea! I totally forgot about reversible motors. I would do the 4 corners because I find that more stable. But how would motors on the sides be able to provide thrust? I can see how it would work for spin/steering.
     
  5. xoxorockoutloud123

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    Jun 17, 2013
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    As a side note, I plan on making this very very light.
     
  6. Dr.killjoy

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    Apr 28, 2013
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    I think you would be better off using 2 electric turbine fans and work from there...
     
  7. xoxorockoutloud123

    Thread Starter New Member

    Jun 17, 2013
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    Do u possibly know here I could find some small ones though?
     
  8. Dr.killjoy

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    Try hobbyking or any hobby shop..
     
  9. xoxorockoutloud123

    Thread Starter New Member

    Jun 17, 2013
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    Thanks. Are you trying to say that the turbine fans should be used for lift, thrust or spin?
     
  10. Dr.killjoy

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    Apr 28, 2013
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    There are using them in R/C Jet and I think they are the most efficient design for lift and thrust ...

    [​IMG]

    [​IMG]
     
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  11. xoxorockoutloud123

    Thread Starter New Member

    Jun 17, 2013
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    Ah I see. So, one on the bottom and one in the rear? Because I'm trying to make the car hover, not fly.
     
  12. tubeguy

    Well-Known Member

    Nov 3, 2012
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    The thrust-steering fans would be mounted on each side like props on a twin-engined airplane.
     
  13. xoxorockoutloud123

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    Jun 17, 2013
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    But won't the car fly just like an airplane?
     
  14. xoxorockoutloud123

    Thread Starter New Member

    Jun 17, 2013
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    If that works, then one will pull air while the other will push air to provide a form of spin?
     
  15. tubeguy

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    Nov 3, 2012
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    I'll assume this question is regarding the steering motors. So no, not unless the motors were strong enough to lift the car and were thrusting straight down like a helicopter. :)
     
  16. wayneh

    Expert

    Sep 9, 2010
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    If you give some thought to the physics, you'll find that 90+ percent of the onboard power must be devoted to lift, and that the budget for any other weight is very small. A slight change of the main thrust off vertical will give you plenty of lateral component thrust. Think helicopter. There's no separate lateral thrust except for jet copters.
     
  17. xoxorockoutloud123

    Thread Starter New Member

    Jun 17, 2013
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    I definitely see your point! So basically, I should have very strong fans produce the lift and use relatively weak fans for separate lateral thrust? I don't see another way I could possibly get somewhat off vertical without a separate lateral thrust. I don't think weight will be too much of a problem because I am going to use a very light chassis and I am trying to find the lightest fans available. :)
     
  18. wayneh

    Expert

    Sep 9, 2010
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    If you have 3 thrust fans in a triangle, you could control their relative contributions and get any lateral vector you need. They wouldn't need to articulate, like you would need for a single fan config.
     
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  19. xoxorockoutloud123

    Thread Starter New Member

    Jun 17, 2013
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    That is a brilliant idea! I was primarily thinking of a single fan config but this works marvelously!!! But how would you be able to control the power of the fans? Would you need a separate speed controller for that?
     
  20. wayneh

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    Sep 9, 2010
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