Hangar 9 1/4-Scale J-3 Cub ARF - Manual (Page 39)

39
The.amount.of.control.throw.should.be.adjusted.as.closely.
as.possible.using.mechanical.means,.rather.than.making.
large.changes.electronically.at.the.radio..By.moving.
the.position.of.the.clevis.at.the.control.horn.toward.the.
outermost.hole,.you.will.decrease.the.amount.of.control.
throw.of.the.control.surface:.moving.it.toward.the.control.
surface.will.increase.the.amount.of.throw;.moving.the.
pushrod.wire.at.the.servo.arm.will.have.the.opposite.
effect..Moving.it.closer.to.center.will.decrease.throw,.
and.away.from.center.will.increase.throw..Work.with.a.
combination.of.the.two.to.achieve.the.closest.or.exact.
control.throws.listed.
Aileron:
High.Rate:. 1
.
1 /
8
-inch.(28mm).up
. 1
.
1 /
8
-inch.(28mm).down
Low.Rate:. 3/4-inch.(19mm).up
.
3/4-inch.(19mm).down
Note:.Aileron.throw.is.measured.at.the.trailing.
edge.of.the.aileron.nearest.the.fuselage.
Elevator:
High.Rate:. 2-inch.(51mm).up/down
Low.Rate:. 1
.
1 /
4
-inch.(32mm).up/down
Note:.Elevator.throw.is.measured.
at.the.trailing.edge.of.the.elevator.
next.to.the.fuselage.
Rudder:
High.Rate:. 2
.
1 /
4
-inch.(57mm).left/right
Low.Rate:. 1
.
1 /
2
-inch.(38mm).left/right
Note:.Rudder.throw.is.measured.
at.the.bottom.of.the.rudder.
An.important.part.of.preparing.the.aircraft.for.flight.is.
properly.balancing.the.model..This.is.especially.important.
when.various.engines.are.mounted.
Caution:.Do.not.inadvertently.skip.this.step!
The.recommended.Center.of.Gravity.(CG).location.for..
the.Piper.J-3.Cub.is.CG:.4
.
1 /
2
.inches.(114mm).back..
from.leading.edge.of.wing.at.the.root.rib..Mark.the.
location.of.the.CG.onto.the.bottom.of.the.wing.using..
a.felt-tipped.pen..Make.sure.the.aircraft.is.upright.when.
checking.the.CG..If.the.nose.of.your.aircraft.hangs.low,.
add.weight.to.the.rear.of.the.aircraft..If.the.tail.hangs.low,.
add.weight.to.the.nose.of.the.aircraft..Stick-on.weights..
are.available.at.your.local.hobby.store.and.work.well.for.
this.purpose..The.CG.Range.for.your.Piper.J-3.Cub.is..
4–4
.
3 /
4
.inches.(102mm–120mm).back.from.leading..
edge.of.wing.at.the.root.rib.
Control Throws
Recommended Center of Gravity (CG)