Rolling Takeoff (Wheel-Type Landing Gear)

Objective

The CFI candidate will demonstrate the ability to teach the rolling takeoff maneuver for helicopters equipped with wheel-type landing gear. Upon completion, the candidate will explain elements, performance factors, risk considerations, proper technique, and common errors while demonstrating the ability to evaluate student performance according to ACS task HI.IX.E standards.

Content

Elements of a Rolling Takeoff (HI.IX.E.K1)

A rolling takeoff allows the helicopter to accelerate horizontally while still in contact with the ground, building forward airspeed before becoming airborne. This technique offers several advantages over a vertical takeoff:

• Ground effect utilization: Helicopter remains in ground effect longer, reducing power requirements
• Translational lift achievement: Forward airspeed development allows earlier translational lift benefits
• Improved performance: Particularly beneficial in high density altitude or high gross weight conditions
• Surface friction reduction: Wheels rolling versus skids sliding reduces ground friction

The maneuver consists of three distinct phases:

1. Ground roll phase: Helicopter accelerates while maintaining ground contact
2. Liftoff phase: Helicopter becomes airborne at effective translational lift airspeed
3. Climb phase: Transition to normal climb attitude and airspeed

Performance Factors

Effects of Wind, Weight, Temperature, and Density Altitude (HI.IX.E.K2)

Wind Effects: Headwind components reduce ground roll distance and improve climb performance. Crosswinds require drift correction during ground roll and initial climb. Tailwinds increase ground roll distance and degrade climb performance significantly.

Weight Impact: Heavier helicopters require longer ground roll distances, more power for liftoff, and exhibit reduced climb performance. The relationship between weight and performance is exponential—small weight increases create disproportionately large performance penalties.

Temperature and Density Altitude: Higher density altitudes reduce engine power output, rotor efficiency, and overall helicopter performance. Think of it like trying to swim in thin air—everything works harder for less result. Standard day performance charts become meaningless in high/hot conditions.

When to Use Rolling Takeoffs (HI.IX.E.K3)

Rolling takeoffs are recommended when:

• Maximum performance required: High gross weight or high density altitude operations
• Obstacle clearance: Need maximum climb angle after achieving translational lift
• Power limitations: Insufficient power for vertical takeoff
• Efficiency desired: Reducing power requirements and fuel consumption
• Surface conditions suitable: Smooth, firm surface with adequate length

Consider runway length, surface conditions, wind, and helicopter performance charts when determining feasibility.

Translational Lift (HI.IX.E.K4)

Translational lift occurs when forward airspeed reduces rotor downwash recirculation, improving rotor efficiency. This phenomenon typically begins around 10-15 knots and reaches maximum effectiveness around 16-24 knots, depending on helicopter type.

Benefits include:

• Reduced power requirements for given lift
• Improved directional control
• Enhanced climb performance
• Decreased vortex ring state susceptibility

Risk Management Considerations

Takeoff Path Selection (HI.IX.E.R1)

Select takeoff paths considering helicopter performance limitations, available distance, and wind conditions. Calculate required runway length using performance charts adjusted for actual conditions. Ensure adequate overrun area for rejected takeoffs.

Wind Effects (HI.IX.E.R2, HI.IX.E.R3, HI.IX.E.R4)

Wind Direction: Plan for crosswind corrections throughout the maneuver. Strong crosswinds may require weathercock tendency corrections.

Windshear: Sudden wind changes during takeoff can cause altitude, airspeed, or control deviations. Be prepared for power adjustments and control inputs.

Turbulence: Including wake turbulence from other aircraft affects helicopter control during ground roll and initial climb. Plan separation and be ready for immediate control responses.

Critical Planning Items (HI.IX.E.R5, HI.IX.E.R6, HI.IX.E.R7)

Height/Velocity Considerations: Plan takeoff profile to minimize time in H/V avoid areas. Understand that rolling takeoffs may require brief H/V exposure during transition.

Rejected Takeoff: Establish decision points and procedures for aborting the takeoff. Know your helicopter’s stopping distances and emergency procedures.

Powerplant Failure: Understand autorotation entry procedures from various phases of takeoff. The worst-case scenario is power failure during transition through effective translational lift.

Additional Hazards (HI.IX.E.R8, HI.IX.E.R9, HI.IX.E.R10, HI.IX.E.R11)

Collision hazards with other aircraft, ground vehicles, or obstacles require constant vigilance and proper communication.

Takeoff surface conditions affect ground roll characteristics. Soft, rough, or contaminated surfaces may prevent successful rolling takeoffs.

Landing gear limitations include maximum ground speeds and surface restrictions for wheel-type gear.

Distractions and situational awareness are critical—rolling takeoffs require divided attention between power management, directional control, and obstacle avoidance.

Common Errors (HI.IX.E.K5)

1. Insufficient power application: Causes extended ground roll or inability to achieve translational lift
2. Excessive nose-low attitude: Creates excessive forward acceleration without adequate lift development
3. Poor directional control: Allowing helicopter to drift or weathercock during ground roll
4. Premature liftoff attempts: Trying to lift off before achieving effective translational lift
5. Inadequate crosswind correction: Resulting in drift after liftoff
6. Power mismanagement: Sudden power changes causing altitude or airspeed deviations
7. Target fixation: Focusing on instruments instead of maintaining situational awareness

Schedule

Equipment

Required References

• FAA-H-8083-4, Helicopter Instructor’s Handbook
• FAA-H-8083-21, Helicopter Flying Handbook
• FAA-S-ACS-29, Helicopter Flight Instructor Certification Standards
• Aircraft Flight Manual/Pilot’s Operating Handbook
• Performance charts and weight & balance data

Materials and Visual Aids

• Whiteboard/markers for diagram illustrations
• Model helicopter for demonstrating forces and control inputs
• Airport diagram showing suitable takeoff areas
• Performance calculation worksheets
• Checklist copies for student reference

Instructor Actions

The CFI candidate will:

1. Explain rolling takeoff theory using clear analogies—compare to airplane takeoff techniques and emphasize translational lift benefits
2. Demonstrate performance calculations using actual aircraft data and current conditions
3. Show proper risk assessment by evaluating wind, runway conditions, and helicopter limitations
4. Execute complete rolling takeoff while providing real-time narration of control inputs and decision points
5. Identify wind indicators and explain crosswind correction techniques
6. Demonstrate radio procedures appropriate for the operating environment
7. Show error recognition by deliberately demonstrating common mistakes and their corrections
8. Guide student practice with timely, specific feedback on technique improvements
9. Evaluate student performance against ACS standards and provide constructive critique

Student Actions

The student will:

1. Ask questions about elements, performance factors, and risk considerations
2. Calculate performance requirements using provided charts and current conditions
3. Assess wind conditions using available indicators and determine corrections needed
4. Practice control techniques following instructor demonstration and guidance
5. Execute rolling takeoffs with increasing independence and proficiency
6. Identify errors in technique and apply appropriate corrections
7. Demonstrate radio procedures and runway incursion avoidance techniques
8. Self-evaluate performance against stated standards and seek clarification when needed

Completion Standards

The CFI candidate demonstrates instructional competency when they can teach a student to perform rolling takeoffs meeting ACS task HI.IX.E standards:

Knowledge Standards: Student can explain rolling takeoff elements, performance factors affecting the maneuver, appropriate use scenarios, translational lift concepts, and common errors.

Risk Management Standards: Student can assess takeoff path suitability, wind effects, turbulence considerations, H/V implications, rejected takeoff procedures, engine failure scenarios, collision hazards, surface conditions, landing gear limitations, and distraction management.

Skill Standards: Student can:

• Complete appropriate checklists (HI.IX.E.S1)
• Make proper radio calls (HI.IX.E.S2)
• Determine wind direction accurately (HI.IX.E.S3)
• Verify correct takeoff path (HI.IX.E.S4)
• Maintain powerplant and Nr within limits (HI.IX.E.S5)
• Apply proper takeoff roll control inputs (HI.IX.E.S6)
• Maintain ground track with crosswind correction during acceleration (HI.IX.E.S7)
• Transition to climb airspeed ±5 knots with appropriate power (HI.IX.E.S8)
• Maintain ground track after liftoff (HI.IX.E.S9)
• Use runway incursion avoidance procedures (HI.IX.E.S10)
• Analyze and correct common errors (HI.IX.E.S11)

Instructional Standards: The CFI candidate demonstrates effective teaching through clear explanations, appropriate demonstrations, timely feedback, error recognition, and student performance evaluation consistent with ACS task HI.IX.E requirements.