previous article
Specific Area Treatments: Wing Cover
The wing carries all of the vibration from the control surfaces plus the gaps into the cabin and might also add whistles from the holes required for control pushrods and such. It should be treated similarly to the floors.
This is a rough guide of acoustic treatments for the wing cover of a typical single engine light aircraft, or a multi-engine light aircraft with the engine on the wings. The actual results may differ from aircraft to aircraft since this by necessity must be a generalization of typical noise path and vibration common to most light aircraft. Some aircraft may be limited by space, clearances, internal volume, and contact with the pilot and passengers that therefore must be taken into account
Level 3 provides basic coverage and Level 1 offers the most insulation.
Wing Spar Cover, Single Engine
Acoustic Level 1 Treatment:
- 1. 1/4" felt with barrier on top of spar.
- 2. Cover with .40 lb. per sq. ft. barrier.
- 3. Carpet over for comfort, appearance, and acoustics.
Acoustic Level 2 Treatment:
- 1. 1/8" felt on top of spar.
- 2. Cover with .20 lb. per sq. ft. barrier.
- 3. Carpet over for comfort, appearance, and acoustics.
Acoustic Level 3 Treatment:
- 1. Cover spar in 1/4" felt.
- 1. Carpet over for comfort, appearance, and acoustics.
Wing Cover, multi-engine with engine on the wings
Acoustic Level 1 Treatment:
- 1. If holes exist for weight reduction or other, tape .40 lb. per sq. ft. barrier over holes and gasket penetrations.
- 2. Place 1/4" felt with .40 lb barrier on top of spar.
- 3. Carpet over for comfort, appearance, and acoustics.
Acoustic Level 2 Treatment:
- 1. If holes exist for weight reduction or other, tape .20 lb. per sq. ft. barrier over holes and gasket penetrations.
- 2. Place 1/8" felt with .20 lb barrier on top of floors.
- 3. Carpet over for comfort, appearance, and acoustics.
Acoustic Level 3 Treatment:
- 1. 1/4" felt on top of floors.
- 2. Carpet over for comfort, appearance, and acoustics.
