Goal
To create a sub-sonic aircraft with higher economic efficiency, greater payload-to-structure ratio, improved safety and lower operating costs by using a novel delta-planform fuselage, tandem shoulder wings and rear-mounted powerplant.
Problem
Conventional agricultural aircraft suffer from poor fuselage volume utilisation, higher structural weight, larger wetted area, and less efficient lift-to-drag ratios, leading to higher operating costs and limited payload flexibility.
Concept Summary
The airdynecraft (Airtruk) employs a streamlined delta-planform fuselage that contributes lift, two shoulder-mounted wings arranged in a close tandem cascade at low or negative incidence, and a rear-mounted piston engine. The configuration centralises thrust, reduces drag, enhances ground-effect lift, and allows interchangeable, modular components for economical manufacturing.
Principles
- Aerodynamic lift augmentation via fuselage and tandem wings
- Centralised rear thrust line
- Ground-effect cushion for short take-off and landing
- Fail-safe structural design
- Variable camber airfoil sections
Scientific Domains
Materials
- Aluminum
- Fiberglass
- Steel
Mechanisms of Action
- Lift generation from delta fuselage and shoulder wings
- Thrust produced by rear-mounted piston engine
- Ground-effect lift due to low-wing clearance
- Antiauto-rotation stability from fuselage lift above CG
Energy Sources
Applications
- Aerial chemical spraying
- Cargo transport
- Air ambulance
- Aerial survey
Claimed Performance
Maximum speed 103 kn (119 mph), cruise speed ~95 kn, payload up to 1 tonne, take-off weight 4 090 lb, climb rate ~600 ft/min, service ceiling ~10 500 ft.
Experimental Evidence
First flight 22 April 1965; certification 10 February 1966; flutter-clearance tests by ARL; production of at least 120 units by 1988; operational use as agricultural sprayer, cargo, ambulance and survey aircraft.
Replication Status
Limited-run production completed (~=120 aircraft built); no current commercial production.
Limitations
- Relatively low maximum speed compared to modern aircraft
- Limited to sub-sonic operation
- Production ceased in early 1990s
