Current Issues

Goebler-Hirthmotoren GmbH & Co. KG has been working with MartinUAV on a new propulsion system for their V-BAT transitional vertical take-off and landing (VTOL) to improve operational endurance and to add heavy fuel capability. MartinUAV successfully flew this new gasoline engine on February 28th and demonstrated hover and transitioned to horizontal flight. The engine that MartinUAV integrated and flew in the V-Bat was Hirth's 15hp 4201 air-cooled 2-stroke boxer engine.

Features of the 183cc 4201 engine include: advanced closed loop fuel control to optimize performance, CAN bus or RS485 interface for easy communication with the V-Bat flight computer, on-board data storage of engine run parameters allowing post flight analysis, shielded ECU/harness to protect against electromagnetic interferance (EMI), 1kW starter/generator to provide remote start and air vehicle electrical power. It also features automatic altitude and temperature compensation enabling reliable start and operation in a wide operating range. Temperature: -40 to +50 degree C (-40 to +122 degree F). Altitude: 0 - 6000m (0 - 20,000 ft.). The 4201 variant integrated to the V-Bat can also be adapted with a 1:2 reduction drive for fixed wing applications to spin a larger propeller to reduce noise and increase thrust. There is also an optional iPowerTM variant of the 4201 engine that enables spark ignition operation on heavy fuel. This will allow MartinUAV to meet NATO's one fuel policy which eliminates gasoline for safety and logistic reasons.

On the Aero in Friedrichshafen you can find us this year from 5 - 8. April in Hall A7 Booth 311 together with our partners.

We are looking forward to your visit.

This year we Aare waiting for you in hall B1 booth 319. Exhibits include the popular engines Hirth, as well as:

Coaxheli by Rotorschmiede

Trikes by Solid Air

and our technology iPower.

We appreciate your visit

Our partners are waiting for you at the China (ShenZhen) Trade Fair about International Unmanned Vehicle Systems in November 2015. For further details please visit:

We will be attending the show NOV 8-10 with Dietrich Kehe from Hirth Engines.  We will focus on the UAV area of the air show.  If you will be at the show and would like discuss Hirth’s UAV propulsion solutions, please contact us to set up a meeting:  Bob Schmidt, This email address is being protected from spambots. You need JavaScript enabled to view it., PH: +1 (810) 441-1457 or Dietrich Kehe, This email address is being protected from spambots. You need JavaScript enabled to view it., PH: +49 7144 8551 50.

Dubai Airshow – NOV 8-12 – Dubai, UAE –