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After testing this plane with several different engines, props,
CG locations and countless different control throw settings,
I found the following setup to be ideal for my particular style
of flying 3D.
Mike Cross, Two Time US National Freestyle IMAC Champion
4-7/8" back from the LE of the wing. This is the normal
recommended CG and is perfect for the aircraft to hover.
Going forward or aft creates a small amount of coupling
between the rudder and elevators while hovering. This CG is
also very responsive but still has a comfortable “feel” in flight.
O.S. .91FS pumped (OSMG0890), 15x6 APC (APCQ1506),
Wildcat 15% nitro (CATP1105).
The .61FX hovers pretty well but is a little lacking when
things get out of shape.
The .91FX (OSMG0591) hovers almost as well as the
.91FS with the same 15x6 APC prop. It is not quite as steady
as the .91FS.
NOTE: Flying on the OS 1.20FS caused more tail weight to
be needed, made it so the plane would not sit still on the
runway and made it difficult to maintain a hover. The
hovering was hindered by using such a low throttle setting
that the poor throttle resolution made it very difficult to stay
in one spot. I do not recommend a 120 4-stroke or larger
engine if performance aerobatics are desired.
Spinner 2-1/4" True Turn (TRUQ1065) and True Turn lock nut
(TRUQ3063).
Note: A 2-1/4" nylon spinner is included with the U-Can-Do
3D but with the larger engines it requires extensive trimming
of the spinner. If you have to trim the spinner, I strongly
suggest using an aluminum spinner instead.
Elevators:
Futaba 9250 digital (FUTM0220)
Ailerons:
Futaba 9250 digital
Rudder:
Futaba 9151 digital (FUTM0211)
Throttle:
Futaba 9001 (FUTM0075)
The large control throws require a servo with great centering.
The digital servos are second to none in this department. You
can NOT expect this aircraft to give you optimum performance
on non-ball-bearing standard servos such as Futaba S148.
Larger than stock servo arms are highly recommended for
getting the 3D throws from the U-Can-Do 3D. Do not move
the pushrods in on the control horns to get the increased
throw, as doing this intensifies any play in the system.
Dubro Super Strength Arms set (DUBM6670):
• The longest single sided arm was used on the rudder.
• The mid sized single sided arms were used on the elevators.
• The double-sided arms were made into single sided
aileron servo arms.
Servo Arms
ELEVATOR:
3" [75mm] up
3" [75mm] down
RUDDER:
4" [100mm] right
4" [100mm] left
AILERONS:
2-1/8" [55mm] up
2-1/8" [55mm] down
FLAPERONS: 2" [50mm] up
2" [50mm] down
(assigned to a switch,
not mixed to the elevator)
Expo for 3D rates (no mixing other than expo):
Elevators: -20%
Rudder:
-20%
Ailerons: -20%
3D Control Throws
Servos
Spinner
Engine
C.G.
PERFORMANCE SETTINGS
FOR THE U-CAN-DO 3D
