[Jimmy Valentine]

The only pilot who successfully flew the Granville GB was Jimmy Doolittle who won the Cleveland air races and others in one. The plane was a widow maker

[hattend]

The only pilot who successfully flew the Granville GB was Jimmy Doolittle

And Delmar Benjamin... He built an exact replica GB R-1 and did airshows with it for years.

Yes, it even flew upside down.