This is my "table top stooge" for launching little planes over high grass. The concept was proposed by Currell. I built it with surplus materials, except for the $10 Chicom "Workmate" from Harbor.
The deck is an old plywood cabinet door. The 2x4 on the bottom allows it to clamp directy into the porta-bench.
The "business end" is fabricated from two nose gear bearings, two wheel collars, a spring, and coat hanger wire.
The carpet gives the wheels some traction so as to keep the plane pointed forward.
It has a takeoff roll of about 2 feet, and (like Jimmy Doolittle) you can give up some altitude to gain airspeed.
Works perfect to date. Used for 1/2A and maybe up .09 if I build one. Bigger stuff can handle the grass.