Tail Rotor Flashcards
1
Q
How many blades
A
2
2
Q
Describe the Delta hinge
A
- Stainless steel yoke attached to output shaft via a splined trunnion
- Trunnion provides flapping axis through elastomeric bearings
- Compensates for dissymmetry of lift
3
Q
How is the yoke attached to the TR blade root
A
attached by 2 bolts on each side, for a total of four bolts.
4
Q
Describe the Static stop and yield indicators
A
- On output shaft, inboard of yoke
- Provides visual to determine if yoke has been stressed beyond limits
- Would appear as deformations due to excessive yoke contact
5
Q
Describe the Tail rotor and how aerodynamics are accomplished
A
2 blades, semi-rigid, teetering rotor system
- delta hinge compensates for dissymmetry of lift. The stainless steel yoke is attached to output shaft via a splined trunnion that provides for feathering as it flaps through elastomeric bearings
- Static stop and yield indicators provide visual indication of yoke is stressed beyond limits
- 2 pitch change bearings per blade with pedal creep weights to minimize control forces
- Span wise balance via washers
- Chord wise balance via weights and washers
6
Q
Describe the blade
A
2 asymmetrical composite blades
- Fiberglass/epoxy skin and spar
- Nomex honeycomb core
- Nickel plated stainless steel leading edge abrasion strip
- Coated with conductive pain to protect against lightnign strikes and conductivity
- ~2497 RPM
- 2.53:1 Reducing ratio
- 6.4 inch chord
- 65 inch diameter
- 0 degree blade twist
7
Q
Diameter
A
65 inches
8
Q
Chord
A
6.4 inches constant
9
Q
Blade Twist
A
0 degree
10
Q
RPM
A
~ 2497 RPM @ 100% Nr/Np
11
Q
Ratio
A
2.53:1 Reducing Ratio
12
Q
Describe the gear box
A
Magnesium housing mounted by 4 studs and 2 alignment pins
- 0.33 quart capacity
- 1 chip detector
- 90 degree direction change via 2 spiral bevel gears
- 2.53:1 reducing ratio, from 6,317 to ~2497RPM
