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9.2 inches tip to tip. Will it fly??!!

Posted by Jeff on February 9, 2010 at 10:00am





Rotors pitched to induce nose-up pitch and counter-clockwise yaw


I am beginning to think that this is do-able. it looks very heavy, and i need to do the math to figure out how much thrust I can get out of my brushed motors. I reduced rotor diameter, added a horizontal stab, and added a canopy so it looks more fly-able.


The fun part is almost over, as I need to start diving into the math to make sure this will fly.

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Comments

  • Admin
    Morli February 10, 2010 at 4:23pm
    May " target="_blank"> this will help, it is called tandem trex The controller can be found here with airframe details/kits
  • bGatti February 10, 2010 at 7:20am
    I agree with jeff, that skewing the axis in and out will result in asymmetric forces on the pitch axis. I'm not sure I follow the explanation, but assuming counter-rotating blades; if the forward-moving blades are higher than the rearward-moving blades, then the airframe would indeed pitch upwardly - Which means the avatar design is feature complete?
  • ernani reis February 10, 2010 at 4:07am
    I suggest checking these: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=..., seems promising. (counter rotating twin motor pack with propellers)
  • Zane the brain February 9, 2010 at 4:13pm
    i think you should do what mariano says, as you will still have control, and it will lose some weight.
  • Daniel Gervais February 9, 2010 at 3:38pm
    you only need 1 servo to aim the rotors outward. You can gear it to get equal movement out of each side relative to the main body but at this scale it probably doesnt matter.
  • IKE February 9, 2010 at 3:11pm
    The V-22 has collective pitch-control, and cyclic pitch-control, I think Jeff is trying to compensate for the lack of cyclic / collective with the extra servos.
  • Mariano Gros February 9, 2010 at 2:59pm
    I'm thinking in Osprey V22
    https://www.youtube.com/watch?v=QB4pgsPUkHw
    I believe It only tilt rotors front/back.
  • Jeff February 9, 2010 at 1:15pm
    Thanks for the comment. By tilting the rotors inwards/outwards, I'll control pitch (nose up/down). As shown, tilting rotors inwards towards center line will create an upwards force on the outside of the rotors, which will travel 90deg to the front tips of the rotors, pulling the nose up and inducing pitch.

    Without this control, I am not sure how I would keep the nose of the craft level, especially when hovering with little airflow over the horiz stab . Thoughts?
  • Mariano Gros February 9, 2010 at 12:45pm
    In my opinion you only need to turn rotos in front back direction, not in right left side. You can remove two servos.
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