The phrase "a fully functional prototype" is correct and usable in written English.
It can be used when describing a model or version of a product that operates as intended and is ready for testing or demonstration.
Example: "After months of development, we finally have a fully functional prototype that we can present to potential investors."
Alternatives: "a working prototype" or "an operational prototype".
The Superbus team's latest plan is to unveil a fully functional prototype at the Beijing Olympics in 2008.
A fully functional prototype chip has been submitted for fabrication in fall 2002.
We were so excited to return to our partners with a fully functional prototype, in which we had incorporated the design input received during our previous trips.
The Buoy project currently consists of a fully functional prototype for a web-based app based on a WordPress plug-in, which you can download here.
While the team does not yet have a fully functional prototype, team members continue to press forward.
Despite that, the five left their corporate jobs and managed to build a fully functional prototype in six months, and they say that now venture capitalists are calling since they've demonstrated their ability to make Turtle a real thing.
But they are more likely to find military applications such as BARS (Battlefield Augmented Reality System): "a fully-functional prototype of a multi-user, distributed, wearable computer infrastructure for warfighters operating in the urban environment".
Whether it be a disruptive electronics product in the vein of Pebble, a contentious mayoral campaign seeking wider support, or a medical device manufacturer with a fully-functional prototype, crowdfunding has room to mature to attract such ventures.
We present a complete, fully functional prototype system for brachytherapy, entirely based on open source software systems originally developed for High Energy Physics experiments.
After six months of design, engineering and industrialisation, we now have a first fully functional prototype.
PCC processes based on chemical absorption (with conventional amine solvents) is also currently at a technology readiness level (TRL) of 6 8 (TRL 6 fully integrated pilot tested in a relevant environment, TRL 7 subscale demonstration, fully functional prototype, TRL8 commercial demonstration) (IEAGHG 2014).
