What is a semi-monocoque structure?
Internal skin takes almost all of the stress, with the light skin taking the final remainder.
What are the wing structure elements which take up vertical bending loads?
Wings generally have more than one internal spar. They run from the fuselage to the wingtip and manage the upward and downward motion of the wing.
What is the ideal ratio of fuel to air by weight?
1 part fuel to 12 parts air is the ideal ratio. 1:8 would be a rich mixture and 1:20 would be considered a lean mixture.
What would happen if the primer is not locked?
If the primer is not locked then the engine could be receiving extra fuel into the induction chamber which could result in a rich cut at low power settings when not as much fuel is needed.