Comment by Mariano Gros on February 9, 2010 at 1:45pm

In my opinion you only need to turn rotos in front back direction, not in right left side. You can remove two servos.

Comment by Jeff on February 9, 2010 at 2:15pm

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?

Comment by Mariano Gros on February 9, 2010 at 3:59pm

I'm thinking in Osprey V22
http://www.youtube.com/watch?v=QB4pgsPUkHw
I believe It only tilt rotors front/back.

Comment by IKE on February 9, 2010 at 4:11pm

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.

Comment by Daniel Gervais on February 9, 2010 at 4:38pm

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.

Comment by Zane the brain on February 9, 2010 at 5:13pm

i think you should do what mariano says, as you will still have control, and it will lose some weight.

Comment by ernani reis on February 10, 2010 at 5:07am

I suggest checking these: http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=..., seems promising. (counter rotating twin motor pack with propellers)

Comment by bGatti on February 10, 2010 at 8:20am

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?

Comment by Morli on February 10, 2010 at 5:23pm

May " target="_blank"> this will help, it is called tandem trex The controller can be found here with airframe details/kits

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