Trim Height

Understanding Trim Height

Trim height is a fundamental rigging specification that affects visibility, aesthetics, safety, and technical requirements. Proper trim planning ensures successful installations.

Trim Definition

**Measurement:**

• Floor to bottom of flown object
• At show position (not working/storage)
• Clear, unobstructed measurement

**Reference Point:**

• Usually stage floor
• May be venue floor for arena
• Document reference point

Determining Trim Height

**Sightline Analysis:**

• Furthest audience position
• Seated vs. standing
• Obstructions in path
• Content visibility needs

**Content Considerations:**

• Text legibility at distance
• Image viewing angle
• Camera positions
• Optimal viewing zone

**Physical Constraints:**

• Venue ceiling height
• Rigging point locations
• Stage set clearance
• Lighting positions

Common Trim Heights

**Concert/Festival:**

• Standing audience: 12-20 feet
• High trims for large venues
• Multiple screens at different heights

**Corporate Events:**

• Seated audience: 8-14 feet
• Lower trims acceptable
• Close viewing distances

**Theater/HOW:**

• Sight-line dependent: 10-18 feet
• Fixed seating considerations
• Balcony views

**Broadcast/Studio:**

• Camera dependent: varies
• Often lower trims
• Background considerations

Trim Process

**Initial Set:** 1. Calculate target height 2. Mark motors at target 3. Fly to approximate position 4. Measure actual height 5. Adjust as needed

**Verification:**

• Measure multiple points
• Verify level (unless angled)
• Check sightlines
• Document final trim

Equipment Considerations

**Motor Travel:**

• Cable length limits maximum
• Account for venue height
• Consider storage position

**Cable Management:**

• Power to wall at trim
• Data cables at trim
• Cable drop aesthetics

**Serviceability:**

• Access at trim height
• Ladder/lift requirements
• Emergency procedures

Trim Adjustment

**During Production:**

• Presets in motor controller
• Rehearsed movements
• Safety protocols
• Clear communication

**Between Shows:**

• Different trim for different acts
• Quick changes
• Documented presets

Documentation

**Show Documentation:**

• Specified trim height
• Reference point
• Tolerance (+/- acceptable)
• Reason for trim choice

**As-Built:**

• Actual trim achieved
• Any variations
• Motor settings

Trim and Viewing Angle

**Wall Tilt:** Trim affects optimal viewing angle:

• High trims may need forward tilt
• Angles content toward audience
• Affects rigging complexity

**Calculation:** Consider viewing angle from:

• Front row
• Back row
• Center and sides