Twin City Fans With CE Mark - ES-2-06 - Manual (Page 15)

15. Twin.City.Fan.Engineering.Supplement.2-06
5
4
3
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"
5
4
3
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 6 17 23
30 - 36 9 30 41
42 - 48 12 75 102
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
BL
AD
E
PO
SIT
IO
NS
9
8
7
6
5
4
3
2
1
0
Figure 12. "E" Prop Blade Angle Indicating Marks