The Defiant is a compound helicopter
that is part of the US Army's Joint Multi-Role-Medium Technology Demonstrator program.
Travel Business Review-March 26, 2019-Sikorsky-Boeing SB-1 Defiant compound helicopter
achieves first flight
Johnson  validated the performance analyses of an XH-59A lift-offset compound helicopter
using CAMRAD II (Comprehensive Analytical Method of Rotorcraft Aerodynamics and Dynamics, ), which is a comprehensive analysis code for rotorcrafts.
Last year, the Army downselected from four vendors to two--a Boeing-Sikorsky team offering the SB-1 Defiant, a compound helicopter
with coaxial rotors, and Bell Helicopter offering the V-280 Valor, a tilt-rotor aircraft.
A highly representative example of the above statement is provided by the compound helicopter
parent ("a parent who takes an excessive and overprotective interest in the life of his or her child, esp.
The Mi-38 was originally seen by Mil as a stop-gap, pending availability of the Mi-X1 compound helicopter
, which was to have high-speed blade tips and a ducted pusher propeller.
AVX has developed and has patented a unique compound helicopter
configuration with coaxial rotors and dual ducted fans that combine proven technologies to achieve greater aerodynamic efficiency, speed, range, fuel efficiency, Hover Out of Ground Effect (HOGE) and utility than conventional helicopters.
You might have, for instance, a tilt-rotor for one requirement; a compound helicopter
for another requirement," he said.
Little information is available on the Piasecki Pathfinder IV, a compound helicopter
with the company's patented Vectored-Thrust Ducted Propeller (VTDP) at the rear end.
A burgeoning market for unmanned cargo delivery systems and long endurance intelligence, surveillance and reconnaissance (ISR) platforms for the US military has spurred Textron Systems subsidiary AAI to take a major technology stake in compound helicopter
start-up, Carter Aviation Technologies.
Bell Helicopter's V-280 Valor tiltrotor and Sikorsky-Boeing's SB-1 Defiant, a compound helicopter
with coaxial rotor blades, will make their first flights in 2017.