There are even three experimental planes.

He put experimental planes through their paces until he crashed one into a river bank next to a pasture.

Could this be an experimental plane, something kept secret by the CIA and sent to get him out?

"Must have been some kind of experimental plane," suggested Toby.

No experimental plane is "safe" to fly.

Laminar supersonic flow was achieved in an experimental plane in the 1960's.

Zemo tied the two heroes to the experimental plane, which was now booby-trapped to explode, and launched to their deaths.

The Government hopes to chose a design next year, which will be used to build two experimental planes.

In the early 1990's, I started restoring and flying experimental planes.

The second model was an experimental plane of the flimsiest construction for use in the calmest of seas.