Jim,
You saw where I fly most when you visited the museum this summer
The wheel pants have always worked just fine off of grass (as long as it is short) That 1/4 scale D would be very cool to fly. Honestly built light the OS .95 would haul that airplane extremely well! Both of my 11 lb TF fighters (P-40 and Corsair built by me) Fly with plenty of authority on OS .91 Surpass II's