Compact Composite srl Bk-100 Prime

Fixed Wing Single Engine

Picture of Compact Composite srl Bk-100 Prime

Aircraft Information

ICAO Code
PRIM
Manufacturer
Compact Composite srl
Model
Bk-100 Prime
Aircraft Type
Fixed Wing Single Engine
Primary Role
General Aviation

Technical Data

Engine Type
Inline
Engine Model
912ULS3
Production Years
2012-present
Units Produced
80+
First Flight
2006-05-27
Notable Operators
Air Combat Europe, PLA Aviation

The Blackshape BK-100 Prime is a high-performance ultralight aircraft that brought fighter-like styling and carbon fiber construction to recreational aviation. First flown in 2007 as the Millennium Master prototype, it is a tandem two-seat, low-wing monoplane powered by a 100-horsepower Rotax 912ULS3 engine. With a maximum speed of 211 mph and distinctive bubble canopy design spanning just over 28 feet, the aircraft earned the nickname "Ferrari of the air." The Prime is manufactured by Blackshape SpA in Monopoli, Italy.

Development and Origins

The Blackshape Prime emerged from the bankruptcy of an ambitious Italian startup. Originally conceived as the Millennium Master by Compact Composite srl in Turin, the design first took to the skies on May 27, 2006. A second prototype followed in December 2007, but financial difficulties forced the company into bankruptcy before production could begin. In 2009, Blackshape S.p.A. acquired the orphaned design and transformed it into the Prime, conducting further development before displaying the refined aircraft at the Aeroshow in Friedrichshafen, Germany.

Manufacturing Excellence

Blackshape SpA, founded in 2011 by aeronautical engineer Luciano Belviso and lawyer-professor Angelo Petrosillo, established production facilities in Monopoli, in Italy's Apulian district. The company achieved remarkable efficiency, reaching a production rate of approximately two aircraft per week by the mid-2010s. By 2016, roughly 70 examples had been delivered to customers across 20 countries, with total deliveries exceeding 80 aircraft in subsequent years.

The manufacturer's success attracted international investment from Angelo Investments, which eventually purchased the company outright. Under current leadership of President Giuseppe Mariano and CEO Niccolò Chierroni, Blackshape continues active production and development of new variants.

Revolutionary Construction

The Prime's defining characteristic is its complete carbon fiber airframe, constructed using Blackshape's patented manufacturing technology. This lightweight yet strong construction enables the aircraft's impressive performance figures while maintaining structural integrity under +4/-2G loading conditions. The cantilever low-wing design incorporates double slotted flaps for enhanced low-speed handling, while retractable tricycle landing gear reduces drag in flight.

Weighing just 654 pounds empty and 1,042 pounds fully loaded, the Prime demonstrates exceptional power-to-weight ratio. Its sleek profile and bubble canopy create an unmistakably fighter-like appearance that distinguishes it from conventional light aircraft.

Engine and Performance

The standard BK-100 model utilizes the proven Rotax 912ULS3, a 100-horsepower four-cylinder engine featuring both liquid and air cooling. This powerplant drives a two-blade MTV-33-1-A constant speed propeller, enabling the Prime to achieve a maximum speed of 211 mph and cruise at 171 mph. The aircraft's impressive climb rate of 1,150 feet per minute and short takeoff distance of approximately 492 feet make it suitable for operation from small airfields.

With 66 liters of fuel capacity, the Prime offers a range of 690 miles and endurance of 4.5 hours. The low stalling speed of just 40 mph with flaps deployed provides pilots with comfortable approach speeds despite the aircraft's high-performance capabilities.

International Service

The Prime found immediate acceptance in the recreational flying community, with examples reaching Australia in April 2017. Two aircraft, registered as 24-0685 and 24-0650, began operations from PLA Aviation's base at Tooradin, Victoria, marking the type's expansion into the Asia-Pacific market.

Air Combat Europe at Lelystad Airport in the Netherlands adopted the Prime for air combat training, capitalizing on its fighter-like handling characteristics and robust construction. This military-adjacent role demonstrated the aircraft's versatility beyond pure recreational use.

Variant Development

Recognizing market demand for larger aircraft, Blackshape developed the four-seat BK-160 Gabriel variant powered by a 160-horsepower Lycoming IO-320-D1B engine. The Gabriel received European Aviation Safety Agency certification in 2019 and achieved US approval in 2024, with approximately 20 examples delivered to the professional training market.

The company further refined the training variant with the BK-160-TR, achieving EASA certification in mid-2022. This contemporary data-driven training aircraft incorporates modern avionics and teaching systems for flight schools.

Blackshape also explored unmanned applications, developing a surveillance variant with wing-mounted sensors and describing it as "optionally piloted." Powered by the 115-horsepower Rotax 915 engine, this variant was displayed at the Singapore Air Show in 2020, demonstrating the design's adaptability to emerging market requirements.

Legacy and Impact

The Blackshape Prime succeeded in bringing jet-fighter aesthetics and performance to the ultralight category, proving that small aircraft need not sacrifice style for substance. Its carbon fiber construction techniques influenced broader industry adoption of composite materials in light aircraft manufacturing. The type's international success, spanning from Europe to Australia and eventually North America, established Blackshape as a significant player in the competitive light sport aircraft market.

Today, Prime aircraft continue flying worldwide, representing a successful resurrection of innovative Italian aerospace engineering that might otherwise have been lost to bankruptcy.