Rocket-turbine-powered VTOL aircraft

1. A vertical-takeoff-and-landing (“VTOL”) aircraft comprising:

a non-VTOL aircraft equipped with an engine selected from the group consisting of internal combustion piston engines, room temperature electric machines, and gas turbines, the engine being for forward takeoff and flight; and

a modular boom system interoperably coupled to the non-VTOL aircraft, the modular boom system comprising:

a first modular boom comprising a first rocket-turbine engine, the first modular boom mounted to a first wing of the non-VTOL aircraft; and

a second modular boom comprising a second rocket-turbine engine, the second modular boom mounted to a second wing of the non-VTOL aircraft;

wherein:

the first modular boom comprises a first-modular-boom fore propeller and a first-modular-boom aft propeller, the first-modular-boom fore propeller and the first-modular-boom aft propeller being driven by the first rocket-turbine engine; and

the second modular boom comprises a second-modular-boom fore propeller and a second-modular-boom aft propeller, the second-modular-boom fore propeller and the second-modular-boom aft propeller being driven by the second rocket-turbine engine.

2. The VTOL aircraft of claim 1 , wherein the modular boom system is permanently attached to the non-VTOL aircraft.

3. The VTOL aircraft of claim 1 , wherein the modular boom system has been retrofitted to the non-VTOL aircraft.

4. The VTOL aircraft of claim 1 , wherein the modular boom system is equipped to be jettisoned from the non-VTOL aircraft after the non-VTOL aircraft has taken off.

5. The VTOL aircraft of claim 1 , wherein:

the first modular boom comprises a first-modular-boom fore propeller and a first-modular-boom aft propeller, the first-modular-boom fore propeller and the first-modular-boom aft propeller being driven by the first rocket-turbine engine; and

the second modular boom comprises a second-modular-boom fore propeller and a second-modular-boom aft propeller, the second-modular-boom fore propeller and the second-modular-boom aft propeller being driven by the second rocket-turbine engine.

6. The VTOL aircraft of claim 1 , wherein the first rocket-turbine engine, the second rocket-turbine engine, and engine of the non-VTOL aircraft use the same fuel source.

7. A vertical-takeoff-and-landing (“VTOL”) aircraft comprising:

a non-VTOL aircraft equipped with an engine selected from the group consisting of internal combustion piston engines, room temperature electric machines, and gas turbines, the engine being for forward takeoff and flight; and

a modular boom mounted to the non-VTOL aircraft and comprising:

a rocket turbine engine; and

a first-modular-boom fore propeller and a first-modular-boom aft propeller, the first-modular-boom fore propeller and the first-modular-boom aft propeller being driven by the rocket-turbine engine.

8. The VTOL aircraft of claim 7 , wherein the modular boom comprises a propeller driven by the rocket-turbine engine.

9. The VTOL aircraft of claim 7 , wherein the modular boom is permanently attached to the non-VTOL aircraft.

10. The VTOL aircraft of claim 7 , wherein the modular boom has been retrofitted to the non-VTOL aircraft.

11. The VTOL aircraft of claim 7 , wherein the modular boom is equipped to be jettisoned from the non-VTOL aircraft after the non-VTOL aircraft has taken off.

12. The VTOL aircraft of claim 7 , wherein the rocket-turbine engine and the engine of the non-VTOL aircraft use the same fuel source.