My Sprint flies well with an older P-80. I fly off an asphault runway. Never flown it off grass but my 19# of thrust shouldn't be a problem. I don't think you would really enjoy a sprint with 12 or even 14 pounds of thrust. The great thing about these airframes is the non-pucker factor of flying one. I'm afraid if you had that little thrust the pucker factor would ruin the fun. I would definantly go with the Nano under the circumstances, it would just be more enjoyable and relaxing to fly.

If the Nano flies as well as the Sprint, who cares what it looks like. They say my Sprint looks funny but we all love watching it fly!

Chris