Mr Max Dreher, an aeronautical engineer, has built a series of small turbojet engines between 1952 and 1976. One of them, known as the TJD-76 Baby Mamba, has been mounted on his Prue 215A all metal 12.m sailplane as an auxiliary turbojet.
After initial running on the test stand, Max DREHER installed the engine on his Prue 215 sailplane. To do this he designed a jet pack consisting of the engine, the pressurized fuel system and the lubrication unit. the total weight of this first pack was 25 pounds. An auxiliary oil tank is mounted separately and employs an electrical driven gear pump.
A third unit, the jet control pack (engine controls, instruments, switches) is located in the cockpit.
Prue-215 Jet Technical data
| Manufacturer | Irvin Prue & Max Dreher |
| Type | Jet glider |
| First flight | |
| Nb. built | 1 (with jet) |
| Crew | 1 |
Power plant
| Engine | Dreher | TJD 76C |
| Count | 1 | |
| Type | Turbojet | |
| Max ratings | 245 N | 55 lbs |
Dimensions
| Span | 12,00 m | 40,00 ft |
| Length | m | ft |
| Height | m | ft |
| Surface alaire | 8,36 m² | 90.0 ft² |
Weights
| Empty | kg | lb |
| Crew | kg | lb |
| Fuel & oil | kg | lb |
| Waterballast | Kg | lb |
| Max. permissible | kg | lb |
Performances
| Vne - Max. speed | km/h | mph |
| Vno - Max. crus. speed | km/h | mph |
| Max. rate of climb | m/min | ft/min |
| Service ceiling | m | ft |
| Range | km | miles |
| Landing distance from 50 ft | km/h | mph |
| Take off distance to 50 ft | m | yds |
