jaka

Hi!
All models airplanes ...and full size airplanes benefit from using wash-out in their wings..especially those with tapered wing tips....this is a fact.
Anoter fact is thar models as well as full size airplanes need low weight to realy fly well. Weight is never a good thing in a scale model! There are exceptions to this rule of course and that is sailplanes.To move forward, penetrate the air, they need weight.

There is also a third rule one must follow if you want a good flying scale model and that is to keep engine size/ weight down. To powerful engines and the model will fly like a pattern airplane. Too heavy engines and the airplane will needd bigger/heavier tanks, more fuel, bigger/heavier engine mounts, studier/heavier construction overall and heavier/sturdier landing gear and so on and on.

The problem is always knowning which is the best engine size is for what model...
For my DC-3, weighting 3,6kg and swinging 3-blade 10x5" carbon fiber props, the OS .26 fourstroke is an ideal engine. Anything bigger than this and the airplane will fly too fast.