I have been editing an interview that was carried out some years ago with a Royal Flying Corps pilot, who said that on the Front, when he had an engine failure (of which there were many), he would "VOLPLANE" down in the glide. When asked what Volplane meant, he explained that they would spiral down looking for somewhere to land, as they were usually flying over bomb craters.
Several times, he was forced to land behind enemy lines & get his tool kit out to try & fix the problem!!
I have never come across the term "volplane" before. I wonder if anyone else has?