Boeing/Sikorsky ‘Defiant’ Joint Multi-Role (JMR) Helicopter: Coaxial/Dual-Rotor Compound Helicopter for U.S. Military Special Operations Forces (SOF)

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By David Crane
defrev (at) gmail (dot) com

The following article is property of (DR) and is copyrighted material. If you are reading this article on another website other than, please email us the website address/URL (where the unauthorized DR article reprint is located) at defrev (at) gmail (dot) com. Thank you.

Photo(s) Credit: Sikorsky (Top/First) and (Rest). All DR photos and videos were shot with a Sony Cyber-shot RX100 (DSC-RX100/B) Digital Camera with 20.2 MP (20.2-megapixel) still camera and 1080p HD video camera capability.

October 22, 2013

Fox News just published an article on the Boeing/Sikorsky 'Defiant' Joint Multi-Role (JMR) helicopter prototype, which is a coaxial/dual-rotor compound helicopter that was just introduced at AUSA 2013. Defiant is seemingly based on the Sikorsky X2 Technology Demonstrator and S-97 Raider coaxial/dual-rotor compound helicopters, which DefenseReview (DR) has written about and subsequently examined and photographed at military defense industry exhibitions, including the 2013 NDIA Special Operations Forces Industry Conference (NDIA SOFIC 2013) (see accompanying photos).

The Sikorsky X2 compound helicopter is an impressive-looking aircraft, however it curiously doesn't utilize fixed wings like the Lockheed AH-56 Cheyenne compound attack helicopter did. The Cheyenne compound attack helo's fixed wings not only provided mounting platforms for weapons, but also provided up to 80% lift at speed, taking all that lift stress off the main rotor. So, DR is skeptical about Sikorsky's decision not even to go with shorter wings, but rather to actually do away with them altogether. This looks like a mistake on the surface, but we're going to try to get in touch with Sikorsky engineering team to get their reasons for the omission on the X2 and Defiant JMR helos. It's possible that the aircraft's body, itself, acts as enough of a lift surface to compensate somewhat, but nothing can replace AH-56 Cheyenne-type long fixed wings for the combination weapons mounting and lift capability.

The primary questions Defense Review has about the Sikorsky Defiant JMR compound helicopter are the top speed, cruising speed, load capacity, and personnel capacity. The Sikorsky X2 achieved 250 knots (287.69 mph) in level flight at 70% power in 2010, which is very impressive, so DR would imagine the Defiant at least comes close to that.

It will be interested to see how far the Defiant program gets with sequestration in place. Time will tell.

Company Contact Info:

Sikorsky Aircraft Corporation (SAC)
Email U.S. Military Sales:
Email Commercial/Intl. Sales:
Email Customer Service Engineering:

Paul Jackson
Communications Director
Sikorsky Aircraft Corp.
Office Phone: 203-386-7143

Marianne Heffernan
Communications Manager
Office Phone: 203-386-4373

Aurora Flight Sciences (AFS)
9950 Wakeman Drive
Manassas, VA 20110
Office Phone: 703-369-3633
Fax: 703-369-4514

Tom Clancy
Advanced Concepts and Tactical Systems
Aurora Flight Sciences (AFS)
9950 Wakeman Drive
Manassas, VA 20110
Office Phone: 703-331-1053
Fax: 703-369-4514

Javier de Luis
Research & Development (R&D)
Aurora Flight Sciences (AFS)
One Broadway 12th Floor
Cambridge, MA 02142
Office Phone: 617-500-4800
Fax: 617-500-4810

Patti Woodside
Public Relations (PR)
Aurora Flight Sciences (AFS)
9950 Wakeman Drive
Manassas, VA 20110
Tel: (703) 396-6304
Fax: (703) 331-1080

Lockheed Martin Corporation, Lockheed Martin
6801 Rockledge Drive
Bethesda, MD 20817-1803
Phone: 301-897-6000

© Copyright 2013 All rights reserved. This content/material may not be republished, broadcast, rewritten or redistributed without first receiving permission and providing proper credit and appropriate links.

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Boeing/Sikorsky ‘Defiant’ Joint Multi-Role (JMR) Helicopter: Coaxial/Dual-Rotor Compound Helicopter for U.S. Military Special Operations Forces (SOF) by

About David Crane

David Crane started publishing online in 2001. Since that time, governments, military organizations, Special Operators (i.e. professional trigger pullers), agencies, and civilian tactical shooters the world over have come to depend on Defense Review as the authoritative source of news and information on "the latest and greatest" in the field of military defense and tactical technology and hardware, including tactical firearms, ammunition, equipment, gear, and training.

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