Although the models won't fly, they will have a 12-inch wingspread and look "pretty close to the actual aircraft," he said.

Not much like a Royal trainer; these civilian models would fly themselves, given the chance.

The first flight was in 1953, and the model II flew 65 hours.

In some cases, this quick response can make the model unnecessarily difficult to fly.

These models fly using a small engine powered by carbon dioxide.

Even if the model is flying slowly relative to the ground, its airspeed may still be quite high.

In November model "number six" flew more than 5,000 feet.

The 36-foot model would fly at 16,500 feet.

The second model is smaller - 12-passengers - but flies faster.

Spectators are often surprised to see that such a model can really fly.