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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
air frame is fully assembled, for the Gen 2 machine. (still wondering which way the counter rotations should go on the forward fans, I don't trust the Minsoo Kim, DJI, KK, diagrams.)
I now need to add the ESCs and get the flight controller programmed.
further down the development road (gen 2 or 3), im thinking of a dihedral/anhedral on the two forward fans, but whjat will that do to the spiral mode physics while in forward flight?
wiki: wiki dihedral (aircraft)
quotes:
How dihedral effect stabilizes the spiral mode[edit]
The rolling moment created by the sideslip (labeled as "P") tends to roll the aircraft back to wings level. More dihedral effect tries to roll the wings in the "leveling" direction more strongly, and less dihedral effect tries to roll the wings in the "leveling" direction less strongly. Dihedral effect helps stabilize the spiral mode by tending to roll the wings toward level in proportion to the amount of sideslip that builds up. It's not the whole picture however. At the same time that angle of sideslip is building up, the vertical fin is trying to turn the nose back into the wind, much like a weathervane, minimizing the amount of sideslip that can be present. If there is no sideslip, there can be no restoring rolling moment. If there is less sideslip, there is less restoring rolling moment. Yaw stability created by the vertical fin opposes the tendency for dihedral effect to roll the wings back level by limiting sideslip.
The spiral mode is the tendency to slowly diverge from, or the tendency to slowly return to wings level. If the spiral mode is stable, the aircraft will slowly return to wings-level, if it is unstable, the aircraft will slowly diverge from wings-level. Dihedral effect and yaw stability are the two primary factors that affect the stability of the spiral mode, although there are other factors that affect it less strongly.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
OK, a whole lot has been learned from the previous flight capable version, Gen 1. but now the time has come to move on and use the lessons learned to up the gen 2 tricopter.
Let me list the lessons learned.
- first the ducts need to be stiffer and stronger. -second, the tail must be lighted as much as possible - next, the ducts need to be attached better, they started to droop after a short time. (an anhedral seems dangerous too.) - finally the battery needs to be tripled in mass. - as improvements, battery mounting/attachment and using a bell-crank to move the servo forward will also be implemented. -(A dihedral may also be attempted.)
And a list of proven capabilities:
- vibration is minimal, and doesn't effect the accels' or gyros' at all. (this was a fear of mine) - HD video is so dam cool... - the assymetric tri-copter can approximate the capabilities of the bi-copter. (power efficiency) - large rotor disc area is essential to long flights without enormous battery mass.
to that end, parts have now been layed up out of balsa and CF...
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Tri-copter Multirotor.
