Four (full size) prototypes have been tested.
Several prototypes have been tested and the results are reported.
Prototypes have been tested in places as varied as the Australian outback and the National Mall in Washington, D.C.
Several designs of expanders have been proposed for this application and some prototypes have been tested already.
It's possible that these conflicting reports are because different prototypes have been tested, or because Samsung is releasing different versions with different processors - we'll know more at launch.
Fully-scaled prototypes have been tested under reversal cyclic displacements and the hysteretic response has been proved stable and with a high cumulative ductility.
The exhaust system prototypes have been tested focusing on the engine brake performance and on the exhaust temperatures during warm-up transients.
Utzon, however, maintained that drawings couldn't be done until prototypes had been tested, and asserted scornfully that there was no point in putting the job to tender, as only Symonds had a factory equipped to make the vast plywood sheets required.
In particular, our work group started a R&D programme on micro-cogeneration in 1995: a laboratory, equipped with the most common appliances (washing-machine, dishwasher, storage water heater, …), has been built and some MCHP prototypes have been tested too.
Prototypes have been tested in Haiti, delivering supplies to camps set up in the wake of the 2010 earthquakes and the firm is now planning a wider trial of the technology.
