 | Aircraft | Location & Date | | NX735B (s/n: 1) | USA | | Remarks | Photographer / Copyright owner | | | www.redbackaviation.com🔗 |
 | Aircraft | Location & Date | | NX735B (s/n: 1) | USA | | Remarks | Photographer / Copyright owner | | In this basement workshop Seibel built his “impossible” helicopter. It was made in 3 parts so it could be removed from the cellar without having to be dissembled. | www.redbackaviation.com🔗 |
 | Aircraft | Location & Date | | NX735B (s/n: 1) | USA | | Remarks | Photographer / Copyright owner | | Seibel first built this model to prove his ideas. | www.redbackaviation.com🔗 |
 | Aircraft | Location & Date | | NX735B (s/n: 1) | USA | | Remarks | Photographer / Copyright owner | | To start the 65-hp Franklin aircraft engine, Charles spin-starts it with a cord like an outboard motor. The four stroke helicopter engine has just enough power for this small design to fly. | www.redbackaviation.com🔗 |
 | Aircraft | Location & Date | | NX735B (s/n: 1) | USA | | Remarks | Photographer / Copyright owner | | In his unique system the fuselage splits and moves backward or toward changing the center of gravity of the ship and causing it to climb. | www.redbackaviation.com🔗 |
 | Aircraft | Location & Date | | NX735B (s/n: 1) | USA | | Remarks | Photographer / Copyright owner | | In his unique system the fuselage splits and moves backward or toward changing the center of gravity of the ship and causing it to glide | www.redbackaviation.com🔗 |
 | Aircraft | Location & Date | | | | Remarks | Photographer / Copyright owner | | The blodes of the Seibel are mounted on flexible steel plates of L section. Here the maximum pitch is applied. | Flight International |
 | Aircraft | Location & Date | | | | Remarks | Photographer / Copyright owner | | The blodes of the Seibel are mounted on flexible steel plates of L section. Here the minimum pitch is applied. | Flight International |
 | Aircraft | Location & Date | | | | Remarks | Photographer / Copyright owner | | This is the later version of the S-3 that incorporated conventional cyclic control. | www.aviastar.org🔗 |
 | Aircraft | Location & Date | | | | Remarks | Photographer / Copyright owner | | | collectair.org🔗 |
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