Hello Franz

The first ARF Fouga was also flown with HAMMER 90 ( 9 Kg Thrust ) and it flew very well ( That was before we had the option of 12 KG Turbine in Compact size - K-120 ).

Basically, The Model was designed to be flown from Asphalt.

The Optimum is 12 Kg Thrust and then you can fly from Short Runway as well (Asphalt).

We do not have real Experience with Grass.

The Model Offer You True scale in ARF Right out of the Box.

The weight is not really the issue when you fly this Model with the 12 KG Thrust and you will have More than scale flying ( The wings are made from Airex).

14Kg Thrust is too much.