R O Ltd′s innovative Centre-Line Tiltrotor concept

Rotorcraft Operations Ltd is developing an innovative Centre-Line Tiltrotor concept that will offer efficient hovering plus twice the speed and range of a helicopter.

Tiltrotors are phenomenal aircraft. They hover efficiently and have twice the speed and range of helicopters. The large, first generation tiltrotors are relatively complex and expensive. Even so they are a success, the Bell/Boeing V22 medium lift transport tiltrotor (already 160 in service, final fleet to be 350) and the potential of the civil AgustaWestland AW609 tiltrotor (60 orders) show the tiltrotors′ competitiveness in 30 ton and 10 ton applications.

For applications from 10 tons downwards, our Centre-Line Tiltrotor concept will be very competitive, provided costs are more comparable to helicopters. So to suit this market, R O Ltd is focussed on reducing costs.

The relatively high cost of present tiltrotors arises principally from the complexity of placing the engines and rotors at the extremities of the main wings, and the matching complexity of transmission, wing and fuselage structures needed for support, cross-connection and tilting. R O Ltd′s strategy is to bring the rotors and engines together on the aircraft centre-line, arranged so the transmissions and tilting tasks are eased, and wings and other structures are simplified.

The result is R O Ltd′s Centre-Line Tiltrotor concept, CLTR. It offers efficient hovering plus twice the speed and range of a helicopter, and is predicted to be a formidable competitor, displacing helicopters in many markets and creating new markets of its own.

We enjoyed Forum 69, Phoenix.

Thanks for visiting our booth and listening to the paper!


The MV-22 Osprey

MV-22 Osprey

The V-22 Osprey entered full scale production in 2005/6 and now is in service as the MV-22 with the US Marine Corps (USMC) and as the CV-22 with the USAF.

It has a unique combination of range and speed that out- performs all existing helicopters, including gunship escorts.

Image courtesy of US Marine Corps.

The Centre-Line Tilt-rotor Concept

. . . conversion from helicopter mode to airplane mode.


Download papers and presentations

Reference Downloads
American Helicopter Society
International, Forum 69, Phoenix AZ, 21-23 May, 2013
Figure of Merit of Meshing Rotors ‐ effects of overlap, blade twist and cant (lateral tilt) AdobeAbstract Forum 69 - pdf 720K
The Aeronautical Journal, April 2013, Volume 117 Enabling technologies for a Centre-line Tiltrotor AdobePaper TAJ No 1190 - pdf 454K
University of Liverpool, November 2012, UK Seminar on Centre-line Tiltrotor concept
University of Liverpool, November 2011, UK Seminar on Centre-line Tiltrotor concept
RAeS Oxford Branch, 20 September 2011, Oxford, UK A Centre-line Tiltrotor - background and progress to Sept. 2011 Adobe Slides RAeS Oxf11 - pdf 6700K
The European Rotorcraft Forum, 13-15 September 2011, Galarate, Italy 10th Scale Model Tests of a Centreline Tiltrotor Adobe Paper ERF37 - pdf 487K

Adobe Slides ERF37 - pdf 3300K

The Future Rotorcraft, 15-16 June 2011, RAeS, London Enabling technologies for a Centre-line Tiltrotor Adobe Paper FTR11 - pdf 705K
International Powered Lift Conference, October 5-7, 2010. Philadelphia, PA, USA Studies of a Gunship Escort concept for the MV-22
(Centre-line Tiltrotor concept)
Adobe Paper IPLC10 - pdf 700K

Adobe Slides IPLC10 - pdf 1200K

© Rotorcraft Operations Limited 2013 | Tel: +44(0)1235 200 100 | Cell: +44(0)787 939 2080 | email: | webdesign by Technology4Turnover