# US 11,897,628 B2 · Rotorcraft-assisted system for launching and retrieving a fixed-wing aircraft into and from free flight

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- Number: US 11,897,628 B2
- Document ID: US11897628B2
- Status: Granted
- Kind: B2
- Application number: 17/246,969
- Filed: 2021-05-03
- Published: 2021-10-14
- Granted: 2024-02-13
- Earliest claimed: 2017-09-06
- Assignees: Hood Technology Corporation
- Applicants: Hood Technology Corporation
- Inventors: Andreas H. von Flotow; Corydon C. Roeseler
- Web page: https://patentgrep.com/patent/US11897628B2

## CPC

- B64U 70/20: for releasing or capturing UAVs in flight by another aircraft
- B64D 5/00: Aircraft transported by aircraft, e.g. for release or reberthing during flight
- B64F 1/029: {using a cable or tether}
- B64F 1/0295: {aerodynamically or aerostatically supported, e.g. parafoil or balloon}
- B64F 1/222: for storing aircraft, e.g. in hangars
- B64U 10/25: Fixed-wing aircraft (VTOL aircraft B64U10/20)
- B64U 50/13: using external fans or propellers
- B64U 80/70: in containers (B64U80/60 takes precedence)
- B64U 80/82: Airborne vehicles
- B64U 30/10: Wings
- B64U 70/30: for capturing UAVs in flight by ground or sea-based arresting gear, e.g. by a cable or a net
- B64U: UNMANNED AERIAL VEHICLES [UAV]; EQUIPMENT THEREFOR
- B64D: EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64F: GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR

## Abstract

A rotorcraft-assisted system configured to launch a fixed-wing aircraft into flight comprising a fixed-wing aircraft and an aircraft launch apparatus where the aircraft launch apparatus comprises a mechanism for attaching the rotorcraft to the fixed-wing aircraft, such as a saddle that removably engages the wing or wings of the fixed-wing aircraft.

## Claims

### Claim 1

A method for launching a fixed-wing aircraft into wing-borne flight, the method comprising:
attaching a fixed-wing aircraft to an aircraft launch apparatus including a saddle disposed along a longitudinal axis of the fixed-wing aircraft by actuating one or more front engagers and one or more rear engagers to engage a top and a bottom of a first wing of the fixed-wing aircraft;
attaching the aircraft launch apparatus to a rotorcraft;
flying the rotorcraft to a designated altitude; and
releasing the fixed-wing aircraft from the aircraft launch apparatus.

### Claim 2 (depends on 1)

The method of claim 1, wherein the fixed-wing aircraft includes a fuselage between the first wing and a second wing and between a first front engager and a second front engager, and wherein attaching the fixed-wing aircraft to the saddle includes the first front engager engaging the top and bottom of the first wing and the second front engager engaging a top and bottom of the second wing.

### Claim 3 (depends on 2)

The method of claim 2, wherein the first and second front engagers engage a leading edge of each of the first wing and the second wing.

### Claim 4 (depends on 1)

The method of claim 1, which includes attaching the fixed-wing aircraft to the saddle by coupling each of the one or more front engagers to a leading edge of the first wing of the fixed-wing aircraft.

### Claim 5 (depends on 1)

The method of claim 1, wherein actuating the one or more front engagers and one or more rear engagers of the saddle includes pivoting the one or more front engagers about a first axis and pivoting the one or more rear engagers about a second axis.

### Claim 6 (depends on 1)

The method of claim 1, wherein actuating the one or more front engagers and one or more rear engagers of the saddle includes actuating the one or more front engagers to cause the one or more front engagers to pivot about a first axis, wherein pivoting motion of the one or more front engagers forces the one or more rear engagers to pivot about a second axis.

### Claim 7 (depends on 1)

The method of claim 1, wherein the one or more front engagers and the one or more rear engagers are linked such that both one or more front engagers and the one or more rear engagers open simultaneously.

### Claim 8 (depends on 1)

The method of claim 1, which includes attaching the fixed-wing aircraft to the saddle of the aircraft launch apparatus by actuating the one or more front engagers of the saddle relative to respective leading edges of the first wing and a second wing of the fixed-wing aircraft.

### Claim 9 (depends on 1)

The method of claim 1, which includes attaching the fixed-wing aircraft to the saddle of the aircraft launch apparatus by actuating the one or more rear engagers of the saddle relative to respective trailing edges of the first wing and a second wing of the fixed-wing aircraft.

### Claim 10 (depends on 1)

The method of claim 1, which includes stabilizing the aircraft about a vertical (yaw) axis using rear landing gear.

### Claim 11 (depends on 1)

The method of claim 1, which includes flying the rotorcraft substantially horizontally at a designated speed prior to releasing the fixed-wing aircraft from the aircraft launch apparatus.

### Claim 12 (depends on 1)

The method of claim 1, which includes attaching the aircraft launch apparatus to the rotorcraft via a flexible member.

### Claim 13

A method for launching a fixed-wing aircraft into wing-borne flight, the method comprising:
attaching a fixed-wing aircraft to an aircraft launch apparatus;
attaching the aircraft launch apparatus to a rotorcraft;
flying the rotorcraft to a designated altitude;
releasing the fixed-wing aircraft from the aircraft launch apparatus; and
stabilizing the fixed-wing aircraft during flight about a vertical (yaw) axis using rear landing gear.

### Claim 14 (depends on 13)

The method of claim 13, which includes attaching the fixed wing aircraft to a saddle of the aircraft launch apparatus by actuating one or more front engagers and one or more rear engagers of the saddle.

### Claim 15 (depends on 14)

The method of claim 14, which includes attaching the fixed wing aircraft to the saddle by coupling the one or more front engagers to a leading edge of a wing of the fixed-wing aircraft.

### Claim 16 (depends on 14)

The method of claim 14, wherein the fixed-wing aircraft includes a fuselage between two wings, and which includes attaching the fixed-wing aircraft to the saddle by causing a first front engager to engage a top and bottom of a first wing and a second front engager to engage a top and bottom of a second wing.

### Claim 17 (depends on 14)

The method of claim 14, wherein actuating the one or more front engagers and one or more rear engagers of the saddle includes pivoting the one or more front engagers about a first axis and pivoting the one or more rear engagers about a second axis.

### Claim 18 (depends on 14)

The method of claim 14, wherein actuating the one or more front engagers and one or more rear engagers of the saddle includes actuating the one or more front engagers to cause the one or more front engagers to pivot about a first axis, wherein pivoting motion of the one or more front engagers forces the one or more rear engagers to pivot about a second axis.

### Claim 19 (depends on 14)

The method of claim 14, wherein the one or more front engagers and the one or more rear engagers are linked such that both front and rear engagers open simultaneously.

### Claim 20 (depends on 13)

The method of claim 13, which includes attaching the fixed-wing aircraft to a saddle of the aircraft launch apparatus by actuating one or more front engagers of the saddle relative to respective leading edges of wings of the fixed-wing aircraft.

### Claim 21 (depends on 13)

The method of claim 13, which includes flying the rotorcraft substantially horizontally at a designated speed prior to releasing the fixed-wing aircraft from the aircraft launch apparatus.

### Claim 22 (depends on 13)

The method of claim 13, which includes attaching the aircraft launch apparatus to the rotorcraft via a flexible member.