Turbo-Union ATF 401 Fusion Ramjet

The ATF 401 was a miniaturized fusion plasma-air/reaction mass intermix ramjet based on Turbo Union’s earlier ATF 350. This engine was used on Maxwell Dynamics’ Alpha series of fighters, on their VQ-6 Vandal drone and their VA-5 Condor, as well as on various other platforms. In the case of the Alpha and the Vandal, one ATF 401 is mounted in each “arm” to provide additional horizontal thrust while in fighter mode, and two are mounted in the center fuselage to provide VTOL thrust while in fighter mode. The 401 is rated to 46.9 kN standard thrust and a max overboost to 91.1 kN for short periods.

  • Type: fusion plasma-air/reaction mass intermix ramjet
  • Manufacturer: Turbo-Union’s production facility on the Robotech Factory Satellite 
  • Developed from: ATF 350
  • Dimensions:
    • Length: 62 centimeters
    • Diameter: 48 centimeters
    • Dry weight: 455 kg.
  • Ratings:
    • Standard thrust: 46.9 kN
    • Maximum thrust: 91.1 kN
    • Thrust-to-weight ratio: .2 kN/kg.
  • Platforms: Alpha, Beta, Condor, Fragga, Jackal, Vandal


Robotech (R) is the property of Harmony Gold. Genesis Climber MOSPEADA (R) is the property of Fuji Television, Artmic Studio and Tatsunoko Production.  This document is in no way intended to infringe upon their rights.

Original artwork by: Tim Wing (Fighter Mode) and Yoshitaka Amano, Shinji Aramaki and Hideki Kakinuma. (Battloid Mode)

Acknowledgement is extended to Peter Walker, Pieter Thomassen and Robert Morgenstern of the unofficial Robotech Reference Guide. Peter Walker, Pieter Thomassen and Robert Morgenstern are given credit for all quotes and paraphrasing of the unofficial Robotech Reference Guide that has been utilized on Robotech Illustrated. 

Sources: Robotech the Expeditionary Force Marines Source Book by Irvin Jackson

Content by Pieter Thomassen, with Peter Walker and Rob Morgenstern; edited by Tim Wing

Copyright © 2001 Robert Morgenstern, Pieter Thomassen, Peter Walker; 2021 Tim Wing

Leave a Reply

Your email address will not be published. Required fields are marked *