R22 Type Questions

Question 1

Main rotor: articulation?
Number of blades?
Diameter?
Blade chord?
Blade twist?
Tip speed at 104% rpm?

Answer 1

Free to teeter and cone, rigid inplane
2
25’2
7.2” inboard, 7.7” outboard
-8 degree twist
698 feet per second

Question 2

Tail rotor: articulation?
Number of blades?
Diameter?
Blade cord?
Blade twist?
Precone angle?
Tip speed at 104% RPM?

Answer 2

Free to teeter, rigid inplane
2
42”
4” constant
0 degrees
1 degree 11 minutes precone
622 feet per second

Question 3

Drive system:
1. Engine to upper sheave?
2. Upper sheave to drive line?
3. Drive line to main rotor?
4. Drive line to tail rotor?

Answer 3

1. Two double Vee-belts with .8536:1 speed reducing ratio
2. Sprag-type overrunning clutch
3. Spiral-bevel gears with
   11:47 speed reducing ratio
4. Spiral-bevel gears with 3:2 speed increasing ratio

Question 4

Power plant:
1. Model and type?
2. Normal rating for FRIT?
3. Max continuous rating for FRIT?
4. 5 minute take off rating?

Answer 4

1. Lycoming O-320-B2C
2. 160 BHP at 2700 RPM
3. 124 BHP at 2652 RPM (104% on tach)
4. 131 BHP at 2652 RPM

Question 5

Cooling system?

Answer 5

Direct drive squirrel cage blower

Question 6

Fuel?

Answer 6

100 LL avgas (blue)

Question 7

Oil?

Answer 7

SAE15W50 or SAE20W50 (good for all temps)