matwelli
Member
got into a bit of a discussion over at RCG over general bicopter setups
the most common is pendulum style, hang the weight below the props, self levels, makes common sense
then theres the OAT system (oblique axis tilt) where they use the gyroscopic forces from the motrs for attitude control, they also need a tail to enable forward flight
then theres me...... carrying on from bottle copter http://www.youtube.com/watch?v=AxNHACgAi5A , decided to have a good crack at the bicopters and see if i can refine things - i am a believer of having the mass over top of the motor pivot point, sort of like balancing a broom stick vertically with your hand, constantly unballanced, but allows a very dynamic control (dosent try to self level during forward flight
go my "build on" today and came up with this....
1 length of 10mm by 800mm carbon tube, and some PLA plastic parts made last nite on the printer
all up weight 697 grams, 400mm motor to motor, and the centre of mass is 55 mm above the motor pivot point.
not happy with the pivot system, fairly sloppy, need a rethink - probably use the 10mm tube as the bearing surface next time, that will also help lower the pivot point, allowing me to make it more compact
as usual the maiden flight and the breeze is getting up - the pool noodle landing gear (i am using it for orientation) dosent help
as the wind pushes it around
needs tuning, flies ok forwards, but sways a little bit (tuning needs to be worked on) , yaw is fine, and i mixed some roll-yaw to compensate for the prop tourque, it needs to be brought back slightly
the most common is pendulum style, hang the weight below the props, self levels, makes common sense
then theres the OAT system (oblique axis tilt) where they use the gyroscopic forces from the motrs for attitude control, they also need a tail to enable forward flight
then theres me...... carrying on from bottle copter http://www.youtube.com/watch?v=AxNHACgAi5A , decided to have a good crack at the bicopters and see if i can refine things - i am a believer of having the mass over top of the motor pivot point, sort of like balancing a broom stick vertically with your hand, constantly unballanced, but allows a very dynamic control (dosent try to self level during forward flight
go my "build on" today and came up with this....
1 length of 10mm by 800mm carbon tube, and some PLA plastic parts made last nite on the printer
all up weight 697 grams, 400mm motor to motor, and the centre of mass is 55 mm above the motor pivot point.
not happy with the pivot system, fairly sloppy, need a rethink - probably use the 10mm tube as the bearing surface next time, that will also help lower the pivot point, allowing me to make it more compact
as usual the maiden flight and the breeze is getting up - the pool noodle landing gear (i am using it for orientation) dosent help
as the wind pushes it aroundneeds tuning, flies ok forwards, but sways a little bit (tuning needs to be worked on) , yaw is fine, and i mixed some roll-yaw to compensate for the prop tourque, it needs to be brought back slightly
Attachments
Last edited by a moderator: