In April 2007, Advanced Design Alliance personnel were invited by Aeros Ltd., Ukraine, and its partners to participate in development of AC-21 ultralight powered sailplane project.
AC-21 POWERED GLIDER DATA SHEET
| PERFORMANCE | |
| L/D Ratio (expected) | 27 |
| Min Sink Rate (expected), m/s | 0.6 |
| Stall Speed, VS0 (expected), km/h | 47-52 |
| Max Structural Speed Vd, km/h | 168 |
| Engine Make / HP | Hirth F33 / 28HP |
| Climb rate (expected) | 2.5 |
| SPECIFICATIONS | |
| Occupants | 1 |
| Length, m | 6.6 |
| Height, m | 2.15 |
| Wing Span, m | 13.36 |
| Wing Area, sqm | 13.45 |
| Primary Structures Materials | Carbon & Glass Fiber Composites |
| WEIGHTS | |
| MTOW, kg | 264 |
| Empty weight incl. rescue system (expected), kg | 144 |
| Pilot Weight, kg | 60-110 |
ADA people developed following sub-projects:
• collection of design and manufacturing information from one of former Aeros partners;
• structural modifications to implement the newly designed bigger fuselage and the power plant;
• loads definition per German LTF-UL requirements;
• reinforcement of the structure to meet LTF-UL load requirements;
• replacing aluminum ribs with newly designed ones of carbon fiber composites;
• design and development of appropriate tooling, i. e. molds, jigs and fixtures;
• manufacturing structural components for static load tests;
• load test jigs preparation;
• load tests;
- • manufacturing setup;
- • AC-21 prototype manufacturing ;
- • the first flight test.
After the first flight test made in November 2009, ADA personnel participation in the project ended with a share of the project earned.
By now, Advanced Design Alliance has in its possession a set of design, test and manufacturing information that would allow, with an appropriate guide, reproduction and further development of the glider. The set includes as follows:
- • a list of materials;
- • design and manufacturing drawings;
- • CAD files;
- • manufacturing specs and photos;
- • load calculations;
- • load test reports;
- • flight test reports
and comprises 8 disks of DVD-5 format available for review by a potential buyer.
