Gyro/Heli ~
Power TrainOverview:
Ratios between engine, rotor and propeller are fixed. The operational RPM is controlled by a governor.
Sketch:
Working Papers:
|
|
DESIGN: |
A111 |
MAKE: |
A122 |
Secondary Group:
|
|
Assembly: |
|
|
|
|
|
|
|
Propeller: |
Eagle - White belt, 4.511" PD & 9.023" PD sprockets, 2:1 ratio, (page 26) |
|
|
Rotor - Primary: |
Eagle - Orange belt, 2.005" PD & 4.010" PD sprockets, 2:1 ratio, (page 24) |
|
|
Rotor - Secondary: |
Crown & Pinion, Somewhere between 4:1ratio to 6:1 ratio |
|
|
Clutch - Soft Start: |
Located before pinion. |
|
|
Clutch - Overrunning: |
Located between crown and mast. |
|
|
Mast: |
To have strength to transmit all the moments from the engine. |
|
|
Lubrication: |
For Rotor - Secondary gearbox. This maybe splash and not a separate item. |
|
|
Rotor Brake: |
If required or desired. |
|
|
Coupling - Flexible: |
Connects to engine. |
Notes:
xx.
Propeller Belt Drive:
xx.
Primary Rotor Belt Drive:
xx.
Secondary Rotor Crown & Pinion Gear Set:
xx.
Notes Copied from Gyro/Heli V
50/50 Power Splitting between Rotor and Propeller:
General Gyrocopter Data from Homebuilt Rotorcraft:
If ship's gross weight is 660 lb then there must be 330 pounds of static thrust.
An efficient prop will develop around 5 pounds of thrust per horsepower.
It will take at least 66 HP to develop 330 pounds of thrust.
Torque Calculations based on 50% of power to Rotors and 50% of power to Prop:
The following values may be wrong and need revising.
Rotor [Torque x RPM] = Prop [Torque x RPM]
Engine is 65 HP
Operating Rotor RPM is 600
Assume; operating Prop RPM is 2400
Horsepower
[HP] * 5250 = Torque [Q] x RPM [RPM]Therefor Torque
[Q] = (Horsepower [HP] * 5250) / RPM [RPM]Rotor [Torque]
[QR] = (Horsepower [HPR] * 5250) / RPM [RPMR] = (32.5 * 5250) / 600 = 284.4 lb-ftProp [Torque]
[QP] = (Horsepower [HPP] * 5250) / RPM [RPMP] = (32.5 * 5250) / 2400 = 71.1 lb-ft
Back to top | GyroHeli Home Page | SynchroLite Home Page | UniCopter Home Page | Dragonfly Home Page
Last Revised: January 7, 2005