Sovereign Tech Tandem-5 Chinook to ACH-47A Conversion

Ok, lots of small mods completed since I last posted. The biggest one was modifying the rotor head to get more flapping travel. This involved removing ~2mm of material from the outer edge of the hub. Even with softer dampers, the stock head could barely move without hitting a hard stop. This mod expands the travel significantly. I also tossed the stock dampers and used some 70 shore O rings instead.

The mod did get me concerned about the Delta-3 offset in this head design though. The ball link for pitch control is very far inboard of the flapping axis. This results in an unstable system for leading edge control (e.i, a flap up results in increased blade pitch). I consulted with Jim Davy on what he learned from his TwinRexx and decided to switch both my heads to trailing edge control. This should result in a stable system.

For the flight controls, the stock heli includes a special mixer board to allow the 6 servo setup to interface with a conventional FBL. Setup was done with a PC app over Bluetooth and was pretty straightforward. I used an ikon2 with a srxl2 so I could get telemetry to my Spektrum radio. Only one photo today, but a lot of progress!