Hi
Congratulation to Eric for buildind the impact, it's a very great job.
I just want to say there are anothers prebuilt kits (may be F3aLorenz planes are not distributed in USA).
The two planes are alike but there are some differences. The principal are : For the Impact, drawing is straight, underbelly is small, canopy is painted. For Cocaine, drawing is all in curves, underbelly is long and canopy is transparent.
I saw theses patterns in reality and my previous spot was to say that the difference is in relation with buildind and finish (prices are differents also, Impact is cheaper).
For Cocaine or Rhapsody , wing's tube, carbon tubes of the stab are fitted. It's very easy to make it. The alignment wings/stab, the incidences of wings and stab are perfected. It is not made with Impact.
For cocaine there are many designs (thus showed in website and others proposed by Lorenz).
The flights of theses two planes are very excellent (the different results from the pilot).

Claude