Double blade disaster

 

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Flew something for the 1st time since the PCS order. She didn't
oscillate, but didn't have enough power.  That design had no coning
angle.  Back to wing designs.

 

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That had tons of lift, but no control.  The issue with flexible wings
pinching the takeoff pin was solved.  Got a pretty high coning angle.
Also saw very faint LED flickering.  Pitch oscillation was in full
attendance.  The optimum wing diameter for this motor is pretty long.
The lift relative to the balance beam inertia seemed too high.

 

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Tried stiffer wings, but still got a coning angle.  Small weights on the
balance beam & wings didn't do anything.  RPM appeared too low for
stability.

 

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Then, there was eliminating the coning angle.  With this design, we
noticed 1 wing always flew higher than the other, more dramatically than
any other design.  Every spin copter with a double wing was suffering
from blade tracking errors.  Blade tracking seemed to negate any
reduction in coning.

 


There's probably no way to completely fix blade tracking with such light weight,
home made wings.  It would take very precise angle of attack adjustment
on both wings.  It would have to be readjusted often.

A monocopter & all its inefficiency seems to be the only thing you can
make, without sophisticated mechanics.

 

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We did finally discover CA glue desolver is really common acetone, for a
lot more money.  Wish we knew that, 10 years ago.

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Comments

  • It's a bi copter. How would you expect to have any directional control with phased thrust control ?
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