- Porpoising is caused by bad decalage.
- Don't try to solve by changing CG.
- Small foamies can incur twists due to their light construction.
Standard decalage test:
- Perform a power-off vertical dive from high altitude (neutralize elevator).
- A. Model continues straight down: No change needed.
- B. Model pulls to canopy: Increase stab incidence with respect to the wing.
- C. Model pulls to belly: Reduce stab incidence with respect to the wing.