Rodan Senior Heliman Location: Prescott Valley, AZ
| I am running FlyingHobby's (the Lightning Heli) 4 blade head on an Align TRex 450 EC135.
I started with no stabilization, then used the Helitronix mixer with a gyro on the pitch axis, then added weight to the blades, and finally took the stabilization back off.
The key to success (at this size) is tip weighting the blades, keeping the headspeed in the 2000-2400 range depending on all-up weight and tail authority on your setup, and balancing slightly nose heavy.
It will definitely be more challenging to fly than a flybarred head, but can certainly be flown without stabilization if you do the above.
There is a lot of good information (and links to more) in this thread:TRex450 scale head thread
Here's a shot of mine:
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