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Backpack helicopter
Backpack helicopter
Backpack helicopter
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The Pentecost HX-1 Hoppi-Copter, a functional backpack helicopter

A backpack helicopter / helipack is a helicopter motor and rotor and controls assembly that can be strapped to a person's back, so they can walk about on the ground wearing it, and can use it to fly. It uses a harness like a parachute harness and should have a strap between the legs (so the pilot does not fall out of the harness during flight). Some designs may use a ducted fan design to increase upward thrust. Several inventors have tried to make backpack helicopters, with mixed results.

Typically, a backpack helicopter differs from a conventional helicopter in two main ways:

First, there is no tail rotor, and the main rotors are contra-rotating. Yaw is controlled by fine adjustment of a differential gear in the rotor drive transmission. When one rotor is adjusted to spin slightly faster than the other, it induces yaw (turning motion).

Second, the rotors are fixed pitch, which assists with simplicity; this means, however, that in the event of engine failure autorotation is impossible. Usually, a ballistic parachute would be incorporated for safety.

An edition of Popular Science magazine in 1969 featured a backpack helicopter that used small jet engines in a tip jet configuration instead of contra-rotating rotors. This design could function in autorotation. Related are devices like a backpack helicopter which also include a seat and leg supports, which are small, open-topped helicopters. In theory, a helicopter would be more efficient than a rocket-powered jetpack, possessing a greater specific impulse, and being more suited to hovering, due to the lower velocities of the propelled gases.

Australian electric company CopterPack had developed "an electric backpack helicopter with a self-levelling autopilot",[1] and released test videos in June 2021.[2] However, the device consists of two rotors with diameters around 3 feet (0.91 m) connected via carbon fiber tubes to a backpack with battery packs, and a pair of armrests with hand controls on them.[3] Later video analysis revealed operator and equipment were at the end of a drop cable that was edited out using post-production software. [4]

Examples

[edit]
A possible design for a helibackpack with contra-rotating twin rotors

Pure backpacks

[edit]

With a seat

[edit]
  • SoloTrek XFV (Exo-skeletal Flying Vehicle).
  • Martin Jetpack
  • Vortech designed various models which have seats.[10] They formerly also made a pure backpack model with two very long rotor blades driven by a little propane-powered jet motor at the end of each blade.
  • GEN H-4[11]
  • Hirobo bit [ja][12]
  • Trek Aerospace's Springtail [13]

See also

[edit]

References

[edit]
Revisions and contributorsEdit on WikipediaRead on Wikipedia

Backpack helicopter

View on Grokipedia
from Grokipedia
A backpack helicopter, also known as a helipack, is a portable personal rotorcraft system comprising a lightweight engine, rotor assembly, and flight controls that straps to the user's back, enabling short-duration vertical takeoff, hover, and landing for individual transport without a fixed airframe. The concept emerged during as militaries sought compact, soldier-portable flight devices to enhance mobility. In and , engineer Paul Baumgärtl developed the Heliofly series starting in 1941, with the Heliofly III/57 featuring counterrotating single-bladed rotors powered by an 8-horsepower Argus engine, later upgraded to the III/59 model with a 16-horsepower engine capable of lifting up to 120 kg and achieving multiple test flights by the inventor before wartime priorities halted progress. Similarly, the German Nagler-Rolz NR 54, designed by Bruno Nagler in 1941, was a foldable prototype intended for backpack portability with two 8-horsepower engines driving an 8-meter rotor, though the sole V2 variant never achieved flight due to development constraints. Postwar efforts advanced the idea for civilian and military applications. In , inventor created the HX-1 Hoppi-Copter, a 41-kg strap-on unit with 3.66-meter wooden rotors powered by a 20-horsepower , controlled via a cyclic stick; while initial prototypes failed to fly stably due to gyroscopic , later tests demonstrated brief hovers of a few feet but suffered from control difficulties and disorientation, leading to the company's dormancy by the mid- without commercial success. European inventors like Denmark's Vincent Seremet pursued similar designs in the –, with his ryghelikopter using a harness for weight-shift control, though these remained experimental and faced persistent challenges in stability, power , and . Interest revived in the 21st century with electric propulsion and automation, addressing historical limitations in weight and reliability. The Australian CopterPack, developed since around 2020, is a carbon-fiber backpack helicopter with a 3.1-meter wingspan, hybrid turbojet-electric motors, and self-leveling autopilot for assisted flight; weighing under 30 kg empty, it supports a 120-kg payload, reaches speeds of 200 km/h and altitudes up to 3,048 meters, and achieved its first tethered manned flight in 2021, followed by untethered demonstrations evaluating dynamics and stabilization. As of October 2025, the Gen3 version completed its first flight. Despite these innovations, backpack helicopters remain niche due to regulatory hurdles, high operational risks, and limited endurance, typically under 30 minutes per flight.

History

Early concepts and prototypes

The concept of the backpack helicopter emerged during as militaries sought compact, soldier-portable flight devices. In , engineer Paul Baumgärtl developed the Heliofly series starting in 1941, with the Heliofly III/57 featuring counterrotating single-bladed rotors powered by an 8-horsepower Argus engine; the later III/59 model used a 16-horsepower engine capable of lifting up to 120 kg and achieved multiple test flights by Baumgärtl before wartime priorities ended development. In , the Nagler-Rolz NR 54, designed by Bruno Nagler in 1941, was a foldable prototype with two 8-horsepower engines driving an 8-meter rotor, intended for backpack portability; the sole V2 variant never flew due to constraints. Postwar efforts advanced the idea. One early prototype was the Hoppi-Copter, developed by American engineer Horace T. in the . This device featured a backpack-mounted assembly with counter-rotating rotors powered by a small 20-horsepower , allowing the pilot to walk on the ground while wearing it like a harness. filed a key for the design in , describing a adapted to attach directly to the pilot's body for enhanced mobility. The initial Hoppi-Copter prototype lacked landing gear, posing significant safety risks, and testing was limited to tethered hovers a few feet above the ground to prevent uncontrolled falls. Pentecost himself conducted these early demonstrations in the late 1940s, achieving brief lifts but highlighting the device's instability in free flight due to its lightweight construction and rudimentary controls. Despite interest from the U.S. military as a potential replacement for parachutes, the project faced technical hurdles, including inefficient fuel consumption from the small engine and difficulties in maintaining balance without fixed skids. A prototype is preserved at the Smithsonian , underscoring its historical significance as a pioneering effort in personal rotorcraft. European inventors continued experimentation in the 1950s–. Denmark's Vincent Seremet developed the ryghelikopter, using a parachute harness for weight-shift control, though it remained experimental and struggled with stability, power efficiency, and safety. By the , interest persisted, with conceptual designs exploring alternative propulsion to address power limitations. A 1969 article in described an experimental backpack helicopter employing small jet engines in a tip-jet configuration at the rotor blade tips, providing thrust to spin the blades without a central transmission and enabling untethered flight for a pilot under 200 pounds (91 kg). This approach aimed to overcome the issues of single-rotor designs but was constrained by short operational durations—typically around 30 seconds per burn—due to fuel limitations and the inefficiency of early jet technology. Inventors grappled with persistent challenges, such as aerodynamic instability during unguided maneuvers and high fuel demands that restricted practical endurance, as seen in various unbuilt or limited-test prototypes from the era.

Modern developments and commercialization

In the 1980s and 1990s, interest in backpack helicopters revived with projects focusing on more reliable propulsion systems, such as the SoloTrek XFV developed by Trek Aerospace (formerly Millennium Jet Inc.). This single-person VTOL device featured twin ducted fans powered by a running on , designed for hovering and short-range flight with enhanced maneuverability compared to traditional helicopters. The prototype achieved its first untethered flight in December 2001, reaching altitudes of approximately 2 feet (0.6 m), though tethered tests demonstrated potential for higher performance. Development efforts continued into the mid- but ultimately stalled due to persistent funding challenges, halting further by the late . The 2010s and 2020s marked a shift toward electric and hybrid propulsion in backpack helicopter designs, driven by advances in lightweight batteries and materials. A notable example is the CopterPack, an Australian-developed hybrid model with turbojet-electric motors, carbon-fiber construction, and self-leveling autopilot for assisted flight. Weighing under 30 kg empty with a 3.1-meter wingspan, it supports a 120-kg payload, reaches speeds of 200 km/h and altitudes up to 3,048 meters; it achieved its first tethered manned flight in 2021, followed by untethered demonstrations, with the Gen3 prototype completing its first tethered flight in October 2025. Flight durations for such systems typically range from 5 to 10 minutes in electric mode, limited by battery capacity, though hybrid setups aim to extend endurance. Commercialization attempts have faced significant barriers, including funding and regulatory approval, with several projects relying on to advance prototypes. As of 2025, backpack helicopters remain niche due to high operational risks and limited endurance, typically under 30 minutes per flight, amid ongoing FAA and international certification challenges. Recent trends emphasize hybrid propulsion in personal VTOL to balance and emissions, though backpack-specific implementations are in early prototyping stages under regulatory scrutiny.

Design principles

Propulsion and lift mechanisms

Backpack helicopters primarily generate vertical lift through counter-rotating coaxial rotors or ducted fans, configurations that inherently cancel torque without requiring a separate antitorque device, enabling compact designs suitable for personal wear. Coaxial rotors, consisting of two rotors mounted on concentric shafts rotating in opposite directions, provide efficient lift in small-scale applications by doubling the effective disk area while minimizing mechanical complexity. These systems typically require a thrust-to-weight ratio greater than 1:1 to achieve hover, with higher ratios needed for stable maneuvering and vertical performance under varying loads. Early prototypes relied on piston engines delivering 20-50 horsepower to drive the rotors, such as the 20 hp two-cylinder motor in the Pentecost HX-1 Hoppi-Copter, which powered 3.66 m diameter wooden coaxial rotors at 440 rpm to produce sufficient lift for short hops. Modern developments incorporate turbojets or pressure jets for propulsion, often in tip-jet configurations where small engines mounted at blade tips generate thrust ranging from 20-130 lbf per unit, scaled across multiple jets to meet lift demands; for instance, the Gluhareff G8-2 series pressure jets provided up to 25 lbf static thrust each in backpack rotor tests. Electric motors represent a contemporary shift, with systems up to 30-100 kW driving propellers or rotors, as seen in conceptual personal propulsion units using six 5-15 kW brushless motors to achieve 5.3 kN total thrust for hover. Lift in these rotor systems follows the fundamental aerodynamic principle expressed by the equation: L=12ρv2ACLL = \frac{1}{2} \rho v^2 A C_L where LL is lift, ρ\rho is air density, vv is the induced velocity at the rotor disk, AA is the rotor disk area, and CLC_L is the lift coefficient. For backpack designs with relatively small rotor diameters (e.g., 1-4 m), achieving adequate lift necessitates high rotational speeds of 2000-5000 rpm to compensate for the reduced disk area and maintain sufficient induced velocity, as demonstrated in scaled coaxial rotor tests. Efficiency varies by propulsion type, with electric systems offering quieter operation due to the absence of noise, though constrained by energy densities of 200-300 Wh/kg, limiting endurance compared to fuel-based alternatives. In contrast, and systems provide higher power density but generate noise exceeding 100 dB and require complex fuel delivery. These mechanisms prioritize vertical over forward speed, aligning with the hover-centric operation of backpack helicopters.

Structural components and controls

The frame of a backpack helicopter is typically constructed from lightweight composite materials, such as carbon fiber structures, to minimize weight while ensuring structural integrity during flight. These designs often incorporate an ergonomic backpack-style harness with adjustable leg and chest straps that distribute the load primarily to the pilot's hips and shoulders, allowing for ground mobility when not in flight and reducing fatigue during operation. Rotor configurations in backpack helicopters commonly feature two counter-rotating rotors with semi-rigid blades housed in enclosed ducts, which help reduce aerodynamic tip losses by containing airflow and enhance safety by shielding the blades from external obstacles. Cyclic pitch control is achieved through intuitive interfaces like hand grips or joysticks, enabling the pilot to tilt the rotor disc for directional maneuvering without complex mechanical linkages. Early designs often relied on weight-shift methods, such as harness tension or body lean, for collective pitch to modulate lift, while modern systems like the Copterpack use electronic controls integrated with autopilot for precision. Modern backpack helicopters integrate stability aids such as gyroscopic sensors via redundant inertial measurement units () and fly-by-wire autopilot systems to provide auto-leveling and maintain equilibrium, compensating for the inherent of a body-worn platform. Some experimental designs incorporate adjustments to fine-tune the center-of-gravity alignment for balanced tailored to the pilot's body mass and positioning. Control inputs are streamlined for single-pilot operation, with managed via twist grips on the control handles to adjust engine power and rotor speed, collective pitch influenced through harness tension or body lean to modulate overall lift in traditional setups, and yaw controlled by varying differential rotor speeds via a geared transmission. Some designs briefly reference electric propulsion integration for quieter and more efficient power delivery, complementing the structural setup.

Operation

Flight procedures and pilot interface

Pre-flight checks for backpack helicopters involve verifying fuel or battery levels, inspecting rotor integrity for damage or wear, and ensuring the harness fits securely to the pilot's body for stability during flight. In historical designs like the Hoppi-Copter, the engine was started by pulling a cord wound around a flywheel, followed by checks on the counter-rotating rotor blades and control linkages. Modern electric variants, such as the CopterPack, incorporate redundant inertial measurement units (IMUs) and an electronic flight instrument system to confirm system readiness, with pilots adjusting ergonomic leg and chest harnesses that support weights up to 120 kg while leaving arms free for controls. Proper weight and balance is critical for maintaining center of gravity and preventing instability. The takeoff sequence begins with a vertical ascent, initiated by increasing pitch to generate lift from the rotors. For the Hoppi-Copter, pilots used a twist grip on the cyclic stick to apply input, achieving liftoff from a compact 30 area to a hover at low altitudes of around 10 feet. In the CopterPack, takeoff employs (eVTOL) capabilities, where pilots engage the joysticks on waist-height armrests to tilt the ducted rotors independently, ascending smoothly while the self-leveling assists in maintaining stability. Initial training often emphasizes hover practice in simulators to familiarize pilots with response before progressing to actual vertical climbs of 5-20 feet. In-flight maneuvers are constrained to low-altitude operations in historical designs, generally under , focusing on hovers and short displacements up to 1 mile. Control interfaces typically include hand-operated cyclic sticks or joysticks for pitch and roll, with foot pedals or twist grips handling yaw, adapted for the wearable design to allow intuitive body positioning. The CopterPack enhances this with features that enable leaning-based inputs for directional changes, where forward tilt on the rotors facilitates translation while keeping the pilot's arms free. These systems prioritize stable hovers over complex , with pilots monitoring basic for altitude and battery status. Landing procedures involve a controlled descent, reducing or to lower the vertically. In the Hoppi-Copter, pilots gradually decreased collective pitch for a soft using tricycle landing gear, or employed auto-rotation—allowing the rotors to autorotate in mechanical failure for a safe power-off landing by maintaining rotor RPM through airflow. For the CopterPack, the system supports auto-throttle reduction via input, guiding a precise vertical descent aided by the self-leveling to ensure balance upon ground contact.

Performance limitations and capabilities

Backpack helicopters are constrained by their compact, portable design, which prioritizes low weight and ease of ground mobility over extended aerial operations. Flight durations typically range from 5 to 20 minutes in early prototypes, dictated by limited capacities of 0.5 to 2 gallons or equivalent battery storage in electric variants, as larger reserves would wearability and balance; modern estimates suggest up to 30 minutes. Early prototypes demonstrated hovering capability for approximately 3 minutes before power depletion, highlighting the trade-off between engine output and endurance. Speeds vary by design: historical models like the Hoppi-Copter achieved 18 mph in early test flights, with theoretical maximums up to 90 mph, while modern electric variants such as the CopterPack reach up to 200 km/h (124 mph) through rotor tilt for . This underscores range limitations in demonstrated flights—often under a few miles—stemming from fuel constraints and the absence of efficient cruising in early configurations, though theoretical ranges extended to 200 miles. Maximum altitudes in historical low-level tests were around 10 feet, generally under 100 feet for safe operations, but modern designs permit up to 3,048 meters (10,000 feet) under optimal conditions. Environmental sensitivities restrict usability to calm conditions with low winds and clear weather to avoid destabilization of the exposed rotor system and ensure visibility and stability. Noise from close-proximity rotors is significant, precluding urban or noise-sensitive applications. Payload is generally confined to the pilot with minimal additional cargo to preserve the center of gravity and takeoff thrust. Despite these bounds, backpack helicopters enable niche utilities such as short-range search-and-rescue maneuvers or recreational hovering in confined spaces, leveraging their vertical takeoff for access to otherwise unreachable areas. As of October 2025, the CopterPack Gen3 achieved its first flight, demonstrating enhanced stability with self-leveling . The inherent lift requirements demand high rotor disc loading, but practical demonstrations confirm reliable low-level flight for brief, controlled excursions.

Safety and regulation

Inherent risks and mitigation strategies

Backpack helicopters, due to their compact and body-worn , present unique safety challenges stemming from the close integration of systems with the pilot's body. One primary risk is rotor strikes, where the proximity of the rotors to the user's limbs or heightens the chance of contact during takeoff, maneuvering, or unexpected movements, potentially causing severe injuries or fatalities. Engine failure poses another critical , particularly during low-altitude operations typical of personal flight, where there is limited time or height for recovery, often resulting in falls from heights as low as 10-50 feet with high impact forces. Additionally, gyroscopic from the rotors can cause balance disruptions and potential uncontrolled descents. To mitigate these risks, engineers have incorporated features such as redundant power systems in modern electric designs to provide capabilities. Proximity sensors can detect nearby obstacles and trigger alerts to avert rotor strikes in confined operations. Human factors further compound operational hazards, with prolonged exposure to vibrations inducing , muscle strain, and reduced control precision over extended flights. These effects are addressed through padded harnesses that dampen vibrations and distribute loads more evenly across the body to minimize spinal and muscular stress. Training protocols emphasize familiarization with dynamics, procedures, and balance management before solo flights. Modern iterations incorporate autopilots to reduce in maintaining stability, as seen in the CopterPack Gen3's self-leveling system demonstrated in its first flight in October 2025. Documented incidents involving backpack helicopters remain rare owing to their experimental status and limited adoption, though early prototypes like the Hoppi-Copter revealed significant injury risks during tests, including stumbling from gyroscopic forces and potential lethal strikes from rotors contacting the ground during uncontrolled descents. Backpack helicopters often fall under the classification of ultralight vehicles , governed by (FAA) Part 103, which exempts qualifying devices from , airworthiness certification, and pilot licensing requirements. To qualify, these vehicles must have an empty weight not exceeding 254 pounds (115 kg), carry no more than 5 U.S. gallons (19 liters) of fuel, achieve a maximum speed of 55 knots (102 km/h), accommodate only a single occupant for recreational or sport purposes, and operate solely during daylight hours under (VFR). However, operations are restricted to , prohibiting flights within Class A, B, C, or D or near controlled airports without prior authorization, to mitigate risks to manned aviation. Devices exceeding Part 103 limits typically pursue experimental airworthiness under FAA regulations, necessitating proof that at least 51% of the aircraft was built by non-professionals for educational or recreational purposes, followed by rigorous inspections and to demonstrate safety. This process can involve significant delays due to the need for substantiated engineering data, structural integrity tests, and compliance with performance standards. For instance, the SoloTrek XFV project, a ducted-fan developed in the early 2000s, underwent testing but was ultimately sold as an uncertified proof-of-concept without achieving experimental or full type , highlighting the challenges in meeting FAA scrutiny for novel designs. In Europe, the (EASA) imposes even stricter requirements through Certification Specifications for Small (CS-27), mandating comprehensive type that includes detailed design reviews, evaluations, and ongoing compliance monitoring, which has deterred of personal helicopters due to the high costs and timelines involved. Operational constraints extend beyond classification, with pilots of non-ultralight backpack helicopters generally requiring at minimum a private pilot certificate with a category and , along with recurrent flight reviews to ensure proficiency. Liability concerns further complicate use, as while the FAA does not mandate insurance for ultralights or , operators often face practical requirements from launch sites, clubs, or local laws to carry third-party liability coverage—typically at least $1 million—to address potential damages or injuries. Regulatory approaches vary globally, with stricter oversight in regions like under the (CAAC), where personal helicopter operations demand operational approvals, pilot licensing per CCAR-61, and filing for non-commercial flights, often subjecting advanced personal aircraft to additional military or security reviews due to dual-use potential. In contrast, 's applies more permissive rules for recreational microlights under Part 103, allowing operations with a of 600 kg for two occupants and emphasizing self-certification by approved organizations like the Recreational Aircraft Association of New Zealand (RAANZ), fostering easier access for sport flying without full type certification.

Notable examples

Pure backpack designs

Pure backpack helicopter designs emphasize a wearable harness system that provides full body support without any additional seating or frame, allowing the pilot to stand and maneuver during flight while prioritizing extreme portability for personal transport. These systems typically consist of a lightweight frame strapped to the back and torso, with rotors mounted above the shoulders to generate lift directly over the user's . The Hoppi-Copter, developed in the mid-1940s by American inventor Horace T. Pentecost, represents the earliest prototype of such a . Featuring counter-rotating rotors powered by a 20-horsepower , the Hoppi-Copter's frame weighed approximately 90 pounds (41 kg) and was intended for short tethered flights, with later models achieving brief hovers though control issues prevented full success. In the , the CopterPack by an Australian team advanced this concept with a hybrid turbojet-electric twin-rotor configuration, utilizing a carbon fiber frame for reduced weight and improved efficiency. The system incorporates an integrated for hands-free hovering and stable flight, enabling pilots to lean their body for intuitive direction control, with a lightweight carbon fiber frame under 30 kg empty. Targeted at urban mobility applications, the CopterPack supports payloads up to 265 pounds (120 kg) and achieves speeds of up to 124 mph (200 km/h), with a focus on seamless integration into . In October 2025, the Gen3 model was introduced with a demonstration of its first manned flight. Common design traits across pure backpack helicopters include ergonomic strap systems for distributing load across the shoulders, chest, and legs, ensuring the pilot's arms remain free for potential auxiliary controls or tasks. These devices are engineered to be foldable and compact for easy backpack storage and transport, while employing body-lean mechanisms for to simplify piloting without complex cyclic inputs. The primary advantages of pure backpack designs lie in their unmatched portability, allowing users to carry and deploy the unit like standard luggage for on-demand vertical takeoff in constrained environments. However, operation demands significant physical fitness to bear the dynamic loads during hover and maneuvers, limiting accessibility to trained individuals with adequate strength and balance.

Seated or semi-seated variants

Seated or semi-seated variants of helicopters incorporate partial seating or support structures, such as foot rests and straps, to enhance pilot stability and reduce physical strain during flight compared to fully wearable designs. These configurations typically feature fixed struts or skids that serve as and provide leg support, allowing the pilot to assume a semi-reclined or standing posture with body weight partially offloaded. This design approach prioritizes endurance and control for applications like , while maintaining some portability for ground mobility. Key design traits include lightweight support elements, often adding 5-10 pounds to the overall system, which distribute the pilot's weight more evenly and mitigate during hovers or low-altitude maneuvers. Propulsion in these variants commonly relies on compact rotary engines driving counter-rotating ducted fans for lift and , enabling hover times of up to 2 hours and ranges around 184 miles under optimal conditions. However, the added structural elements reduce overall portability, making them less suitable for rapid deployment in confined spaces than pure models. Trade-offs in seated or semi-seated designs emphasize improved postural control, which facilitates precise maneuvering and extended operations, as demonstrated in evaluations for urban and missions. The semi-seated posture allows better integration of controls, such as joysticks for pitch, yaw, and altitude, enhancing pilot interface during sustained flights. These variants have been tested with accessories like spotlights and weapon mounts to support tactical roles, though production has been limited due to developmental challenges. A prominent example is the SoloTrek XFVM, developed by Trek Aerospace in the early as a military-oriented variant of the XFV series. This single-passenger VTOL system uses shoulder and waist straps with foot rests on strut-type for semi-seated support, powered by a 118 hp rotary engine driving two counter-rotating ducted fans. It achieved its first flight in December 2001 and was evaluated for search-and-rescue, reconnaissance, and , with a top speed of 113 mph and a of 834 pounds. No full-scale production followed, though the design influenced later concepts. Another notable design is the EFV, also from Trek Aerospace, introduced in the mid-2000s as an flying vehicle. Featuring an open-air frame with shoulder/waist straps and foot rests on skid , it provides semi-seated stability for the standing pilot. Powered by a similar 118 hp with ducted fans, the prototype first hovered in October 2003 and transitioned to forward flight shortly thereafter, offering up to 2 hours of flight endurance. Marketed as an for $1.25 million, it highlighted potential for personal and tactical VTOL but did not advance to widespread adoption.

References

  1. https://www.atlasobscura.com/articles/object-of-intrigue-backpack-helicopters
  2. https://www.hubschraubermuseum.de/index.php/en/?view=article&id=247:baumgaertl-heliofly-en&catid=18
  3. https://airandspace.si.edu/collection-objects/nagler-rolz-nr-54-v2/nasm_A19590030000
  4. https://airandspace.si.edu/collection-objects/pentecost-hx-1-model-100-hoppi-copter/nasm_A19520054000
  5. https://copterpack.com.au/
  6. https://www.designboom.com/technology/electric-backpack-helicopter-copterpack-autopilot-08-16-2022/
  7. https://www.notebookcheck.net/CopterPack-Gen3-Backpack-helicopter-with-self-leveling-autopilot-makes-first-flight.1144688.0.html
  8. https://patents.google.com/patent/US2461347A/en
  9. https://verticalmag.com/features/hoppi-copter-helicopter-venture/
  10. https://evtol.news/trek-aerospace-solotrek-xfvc
  11. http://www.cnn.com/2002/TECH/ptech/02/06/solotrek.jetpack/index.html
  12. https://www.wired.com/2002/01/jetpack-flies-two-feet-high/
  13. https://rotorcraft.arc.nasa.gov/Publications/files/Young_AIAA02.pdf
  14. http://www.aviastar.org/helicopters_eng/gluharev_meg-1.php
  15. https://digitalcommons.kennesaw.edu/cgi/viewcontent.cgi?filename=2&article=1124&context=egr_srdsn&type=additional
  16. https://evtol.news/copterpack-copterpack
  17. https://www.newscientist.com/article/dn1793-personal-helicopter-gets-off-the-ground/
  18. https://www.techeblog.com/copterpack-backpack-helicopter/
  19. https://newatlas.com/aircraft/copterpack-electric-jetpack/
  20. https://www.forbes.com/sites/peterlyon/2021/06/28/personal-flight-might-be-just-around-the-corner-in-the-copterpack/
  21. https://www.eaa.org/eaa/aviation-interests/ultralights/getting-started-in-ultralight-flying/about-faa-part-103-for-ultralights
  22. https://www.faa.gov/documentLibrary/media/Advisory_Circular/AC_103-7.pdf
  23. https://www.faa.gov/aircraft/gen_av/ultralights/amateur_built/aw
  24. https://www.forbes.com/2003/07/21/cx_zc_0721tentech.html
  25. https://www.easa.europa.eu/en/document-library/certification-specifications/group/cs-27-small-rotorcraft
  26. https://www.faa.gov/pilots/become
  27. https://www.redbackaviation.com/homebuilt-helicopters-pilot-licences/
  28. https://eaaforums.org/showthread.php?4323-Insurance-for-ultralights
  29. http://www.caac.gov.cn/English/Regulations/CCAR/202307/P020230731391917852668.pdf
  30. https://www.aviation.govt.nz/rules/rule-part/part-103/
  31. https://www.youtube.com/watch?v=P7D36fBiMzg
  32. https://evtol.news/trek-aerospace-solotrek-xfvm
  33. https://evtol.news/trek-aerospace-springtail
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