Quest name: That's the light!
Place: Oslya
Requirements: None
Rewards: Mighty plane design, an Amber evil spar
Manufacture: Large Assembly Tool
Fuel: Hot Water or Bottled Hot Water
Process:
1 - Go to the top of the second left cave in Oslya, and the scene will automatically start there.
2 - Talk to Wright, and he will tell you his plane was damaged, so he needs you to give him an Propeller and plane Wings.
3 - Give him both things, and he will reward you with the design and a Amber evil spar.

taken from this guide...it has lotsa designs http://wlodb.com/topics/99