The Zephyr is a solar-powered, high-altitude long-endurance UAV initially developed by QinetiQ, a British company, but which became part of the Airbus High Altitude Pseudo-Satellite (HMAPS) program, becoming known as the Airbus Zephyr

With more than 500 examples built, and over 750 kits sold around the world, the Quad City Challenger series has been very popular on the ultra-light / micro-light market, being available in a variety of models

The Kodiak is a new, high-wing, fixed undercarriage single-engine turboprop powered light transport developed by Quest Aircraft of Standpoint, Idaho

The Venture, and its co-produced Spirit, are light sporting aircraft produced in kit form by Questair Inc, which was formed by Edward MacDonough in the United States, the Venture being designed by James Griswold, an engineer with Piper Aircraft

In 1975 Gene Sheehan and Tom Jewett began looking for a small, reliable engine with low fuel consumption to power a small, efficient, sporting aircraft

The Q2 is a high performance two-seat canard design, a development of the Quickie aimed at the inexperienced first time amateur constructor, with only a small working area and a normal complement of tools