Twin City Fans With CE Mark - ES-2-06 User Manual

Page 15

15.

Twin.City.Fan.Engineering.Supplement.2-06

Tool AS-14093

Blade Tip

Cheater Bar

Hub

Blade

Leading Edge

Detail "X"

Blade

Trailing Edge

Detail.“X”

.Vernier.Index.Line

(Blade.As.Shown

Is.Adjusted.To.35°

)

Figure 10. TCVX Blade Angle Adjustment

25.0"

5.0"

2.5"

Blade

Hub

6..Re-tighten. the. blade. retaining. bolts. to. the. torque.

shown.in.Table.7..Work.in.a.star.pattern,.working.your.

way.up.to.the.desired.torque.in.steps..Tightening.one.

bolt.to.the.full.torque.before.moving.on.to.the.next.

can.crack.the.hub.

Alternate Method

1..Loosen.the.blade.retaining.bolts.until.they.are.finger-

tight.. At. this. point,. the. blades. should. rotate. in. their.

sockets.when.grasped.firmly.and.twisted,.but.not.turn.

on.their.own.

2..Angle.setting.marks.on.the.blade.line.up.with.an.indi-

cating. arrow. on. the. hub.. There. are. two. long. marks.

on.the.blade,.one.for.12°.blade.angle.and.another.for.

32°..Shorter.indicating.marks.at.5°.increments.are.in.

between.the.two.longer.marks..See.Figure.12.

Figure 11. Blade Position Marks

Blade Bolt Torque

Fan Size

Hub Size

Ft - lb

N - m

14 - 24

30 - 36

42 - 48

102

See.Table.3.for.bushing.bolt.torques.-.Use.aluminum.hub.values.

Table 7. "E" Prop Torque Specifications

3..Twist.each.blade.to.the.desired.blade.angle.
4..Re-tighten. the. blade. retaining. bolts. to. the. torque.

shown.in.Table.7..Work.in.a.star.pattern,.working.your.

way.up.to.the.desired.torque.in.steps..Tightening.one.

bolt.to.the.full.torque.before.moving.on.to.the.next.

can.crack.the.hub.

Blade Adjustment on Axiad Adjustable Pitch
Propeller

Each. blade. has. cast. into. it. a. number. of. raised. marks.

with. grooves. in. between. and. the. fairing. has. a. register.

mark.machined.into.it.at.each.blade.opening..See.Figure.

13,.which.identifies.each.of.the.ridges.and.grooves.with.

a.number.from.0.to.9..These.numbers.correspond.to.the.

performance.curve.numbers.shown.in.the.AXIAD.II.design.

performance.manual.

. On.Arrangement.4.Type.3.Axiad.fans,.the.blade.angle.

can.be.adjusted.by.removing.the.inlet.screen..On.ducted.

fans,.the.case.is.provided.with.an.8-inch.square.door.in.

the.fan.tube..To.set.the.blade.pitch,.proceed.as.follows:

NOTE:.A.5/16”.key.with.a.square.drive.adaptor.fitted.to.

a.torque.wrench.is.required..In.most.cases,.a.universal.

joint.will.also.be.needed.

1..After.access.has.been.obtained.to.the.rotor,.loosen.the.

two.blade.bolts.until.the.blade.is.free.to.rotate.

2..Rotate. the. blade. to. line. up. the. register. mark. on.

the.fairing.with.the.desired.blade.angle.mark.on.the.

blade.

CAUTION:.Do.not.exceed.blade.position.9.

3..Tighten.the.two.bolts.evenly.until.a.torque.level.of.65.

ft-lb.(88.N-m).is.reached.

CAUTION:. It. is. important. that. the. blade. bolts. are.

torqued.to.the.specified.value..Do.not.hand-tighten.the.

bolts.

4..Repeat.steps.1.through.3.for.all.blades..Make.sure.all.

Figure 13. Axiad Blade Angle Indicators

INDEX ON

HUB

SIT

Figure 12. "E" Prop Blade Angle Indicating Marks