Current Issues

Dear Sir or Madam,


As a valued customer I wanted to write to you personally to update you on the business strategy for Hirth and our plans at UMS SKELDAR, as the new owner, to consolidate, strengthen and invest in the considerable expertise and heritage of the acknowledged world-leader in 2 stroke engineering across a range of dynamic and developing markets.


Our commitment to our staff and supply chain partners together with our support for the senior management team under my direction as CEO will ensure we are in the best position to support you and to continue delivering industry-leading technology solutions.


The focus on our European-heritage and German technology expertise and track record backed by the ownership of an engineering and innovative business with international presence allows Hirth to continue worldwide adoption of its industry-leading engineering solutions. I am especially excited to become a part of such a prestigious company. The energised team here is committed to realising the continued potential of the business through delivery of engineering excellence backed by a highly professional and motivated management and workforce team with clear business strategies, supported by commercial and global marketing resources.


Following the close of the acquisition, the re-named Hirth Engines GmbH will operate as a standalone business unit – albeit with increased resources and capabilities from UMS SKELDAR – with continued enhancement of the services, products and support we provide you. Hirth will continue to operate globally under the Hirth brand without reduction in our services, technology portfolio or support.


The Hirth team around Henning Nitzsche/Site Manager, Andreas Braendle/ Head of Production and Christian Bitter/Head of R&D will continue to operate the business unit. The dedicated Hirth employees you work with today will be here as well. The newly established Hirth Global Sales GmbH, located in Vienna will be your main point of contact in all relevant sales and support questions. The sales company will be ready for business operation within the next few days.  Mr. Peter Lietz /Head of International Sales will be your main point of contact.


This is an exciting time for Hirth, and we are committed to building on the proud heritage of Hirth as a pioneer and innovator in engine systems and solutions.


I look forward to developing our relationship and to establishing a meeting with you based on your most suitable time slot and location. If you have any questions or require any clarification on your account, please contact me or the Hirth Team via This email address is being protected from spambots. You need JavaScript enabled to view it..  



Axel Cavalli-Björkman

CEO Hirth Engines GmbH

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: