Second Generation Open Source airframe released!

Second Generation Open Source Airframe

Second Generation Open Source Airframe

OpenRelief is proud to announce the release of the second generation open source airframe.

Edward Strickland, a gentleman with a degree in aeronautical engineering, experience with Open Source Auto Pilots and 7 years experience with QinetiQ and UK MoD, has lead the development of the OpenRelief airframe. This is an expansion of his research regarding commercial Vertical Take Off and Landing (VTOL) drones.

The first version of the OpenRelief CTOL-UAV airframe was released on the 6th of July 2012. You can read the original release announcement here and download the version 1.0 CAD files / bill of material here. It is based on a Conventional Take Off and Landing (CTOL) airframe Eddie developed for VTOL testing purposes.

Eddie and his team in the UK have been hard at work to simplify the build, improve the strength and enhance the performance of the OpenRelief airframe since July last year. OpenRelief is proud to announce the release of the 2.0 airframe at LinuxCon Japan on the 31st of May 2013. It features the following refinements:

• Updated tail section to simplify and strengthen
• Updated front fuselage to strengthen
• Updated rear fuselage to strengthen
• Added some reference photographs to assist with build

The airframe is licensed it under the TAPR Open Hardware License 1.0 (

You can download the CAD schematics and the bill of materials here:

Here is an overview of the specs:
* Length 1.4 meters
* Wing span 1.8 meters
* Chord 30cm
* Uses counter-rotating motors (redundancy, speed, balance, no torque)
* Uses remote servos (wing flaperons, the tail surface) for more storage and ease of repair
* Empty weight 3kg
* Thrust is 12kgs
* Max load 12kg (lift at 100mph/160kph is approx 12kg)
* Endurance is between 1 to 4 hours with existing specifications
* Wings can be repositioned to change CoG for large payloads
* Stringers located on the fuselage to carry the wing, landing gear and other items (modules)
* These channels also hold internal items like the motor via bulkhead rings, for quick changes
* Fuselage can carry liquids (same diameter as 2L bottle of cola)
* Can be launched by rail and use parachute recovery
* Can be fitted with front wheels for conventional landing in rough fields

* CAD files are from Solidworks

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