While many are familiar with the U.S. Army's Boeing CH-47 Chinook tandem-rotor helicopter, the U.S. Marine Corps used a different model, the Boeing Vertol CH-46 "Phrog" Sea Knight, which it began ...

After more than 50 years of service to the U.S. Marine Corps, the CH-46 Sea Knight, affectionately known as the “Phrog,” jumped into the history books Aug. 1, with a final flight to the Smithsonian’s ...

This year marked the passing of Frank Piasecki, one of the pioneers of rotary aircraft. Piasecki was perhaps best known as the man who successfully developed the first tandem-rotor helicopter, paving ...

After 51 years of service with the US Marine Corps, the Boeing-Vertol CH-46 Sea Knight flew for the last time 1 August at a retirement ceremony in Chantilly, Virginia. The “Phrog,” which made its ...

Columbia operates the Vertol 107-II and plans an upgraded version. Credit: Columbia Helicopters Columbia Helicopters has signed an agreement with Piasecki Aircraft to develop a new version of the ...