Vertical Take Off

1
Vertical Take Off Landing (VTOL) Aircraft -- A
Comparison
2
Lift / Propulsion / Control Approaches For VTOL
Aircraft (General)
For Shaft-Driven VTOL Aircraft, Need At Least Two
Thrusters

gt One Main, One Anti-Torque


gt Two Equal Size (Opposite Rotation)

gt Thruster Tilting

gt Exhaust Deflection
3
Methods of Transition for Various V/STOL Concepts
4
VTOL Concepts
5
PURE HELICOPTER
6
THERE ARE MAJOR PROBLEMS WITH ADDING A WING
7
COMPOUND HELICOPTER (Fixed Thruster)
8
COMPOUND HELICOPTER (Advancing Blade Concept)
9
COMPOUND HELICOPTER (Vectored Thruster - Open
Prop)
10
COMPOUND HELICOPTER (Vectored Thruster - Ducted
Prop)
11
CANARD ROTOR WING
12
TILT ROTOR
13
TILT WING
14
TILTING DUCTED FANS
15
FAN-IN-WING
16
VECTORED JET LIFT
17
Summary

• VTOL Aircraft Are Inherently More Complex Than
  Conventional Take-Off and Landing (CTOL) Aircraft
• Mechanization Required to Change Direction of
  Thrust With Respect to Aircraft
• Additional Controllers (e.g., Collective Stick,
  Conversion)
• Best VTOL Concept Only Has Meaning in the
  Context of the Mission to be Performed
• What Do You Need Most? Hover Time, Fast Cruise,
  Long Range, . . . ?
• What Do You Have Available? Runway, . . . ?

18
Comparison of Different Types of V/STOL Platforms