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Old 04-13-2013, 12:06 PM
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Dean Bird
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Default RE: CARF-Models 2013 Series 3.1m Extra 330SC

The discussion on the advantages and disadvantages of wood and composite airframes turned into discussing custom built kits and composite airframes.At no point in the discussions was a wood ARF considered a top competition airframe.
The advantages of a custom built kit were:
- Easy to make any modifications you want while the kit is being built
- Stiffness of the airframe and wings can be integrated throughout the entire structure if planned and executed correctly
- Options for lightening during construction
- Easier to repair
The disadvantages of a wood kit were:
- Competition wood airplanes have to be built
- Susceptible to hangar rash
- Absorb fuel and smoke into them
- Airframe quality depends on the wood in the kit
- Not as forgiving to weather (climate change humid to dry and vice versa)
- Covering can bubble and wrinkle
- More maintenance (have to keep a close eye on stringers and formers that pop loose)
- Changes with age
- Deteriorates over time
- Not easily replaceable parts
The advantages of a composite airframe were:
- They have a great finish and are quick to assemble
- The composite planes always look brand new!
- Fit together better in the long run
- Easier to build
- Stronger
- Ailerons are stiffer
- Don’t have to deal with covering
- Handle climate and weather better
- Exact same plane every time
- Easy to duplicate setup on backup plane
- Easy to get replacement parts
- Interchangeable parts
- Easier to fit canisters inside (lots of room inside)
- Basically maintenance free
The disadvantages of a composite airframe were:
- Cannot modify anything on them
- Usually the wings are heavier
- Trailing edges aren’t thick enough
- Any damage takes a different skill set to repair