Goal
Utilize the Coanda effect to enhance thrust, lift, and efficiency in aerial, underwater, and marine propulsion.
Problem
Low propulsion efficiency, high drag, cavitation, and limited lift in conventional propellers.
Concept Summary
The article surveys a series of patents that apply the Coanda effect-a fluid-flow attachment phenomenon-to various propulsion devices. Designs include hybrid reactive propellers for VTOL aircraft, tiltable vertical-take-off aircraft, underwater vector thrusters, pre-swirl stators, cavitation-inducing fluid supplies, and ship-propulsion flow-control modules. By shaping the flow so that jets adhere to curved surfaces, the devices aim to increase entrained mass flow, improve lift, reduce drag and cavitation, and provide vector thrust without complex mechanical vanes.
Principles
- Coanda effect
- Wall-attached jet flow
- Jet entrainment
- Thermo-reactive combustion
- Tesla valve flow control
Scientific Domains
Materials
- Aluminium
- Steel
- Composite polymers
- Heat-resistant alloys
Mechanisms of Action
- Wall-attached jet flow creates additional lift/ thrust
- Air or water entrainment increases effective mass flow
- Thermo-reactive propellers add thrust via combustion jets
- High-pressure jet injection over propeller blades generates lift
Energy Sources
Applications
- VTOL / flying-taxi aircraft
- Aerial lift-enhancement devices
- Underwater vector thrusters
- Ship propulsion with reduced cavitation
Claimed Performance
Patents claim up to 100x increased entrained air, improved load capacity, reduced cavitation, and higher lift-to-drag ratios, with quieter operation.
Experimental Evidence
Prototype descriptions and limited test data are provided in the patent documents; no independent peer-reviewed studies are cited.
Replication Status
No public independent replication reported.
Limitations
- Complex mechanical integration of suction airscrews and thermo-reactive units
- Reliance on precise flow-control surfaces
- Limited publicly available performance data
Red Flags
- Performance claims are not supported by independent testing or peer-reviewed publications