stealth916
Veteran
Location: Rocklin, CA
| About Bell/Hiller
First step is understanding the difference between Bell and Hiller systems. You also should know about gyroscopic precession and the basics of why your heli flys. This is fascinating stuff, and I encourage you to seek out more info.
Here is a generic Google Search .
Anyhow, the stock Eflite Blade CP uses a Hiller only system. So your stick inputs go to the flybar only (go ahead and take a look). You are essentially flying the flybar. Then the flybar makes inputs to the main rotor blades. The effect is a slower response, because the main blade inputs take effect 180 degrees after your stick input. Stanley Hiller called this a 'Servo Rotor' control system.
A Bell system, like that used on modern full size helis, makes inputs directly to the blades. They fly the blades directly, so response is very fast - 90 degrees after stick input.
In a mixed, or hybrid system, which almost all RC CP helis use, a ratio of typically 70/30 of the two systems is combined, typically using mechanical mixing arms or other mechanical means. So 70% of your stick inputs go to the flybar, and 30% goes directly to the main blades. The flybar still makes inputs to the main blades as well. So 30% of the blade inputs takes effect 90 degrees after stick input, and 70% takes effect 180 degrees later (this is all theoretical - the actual mileage may vary).
The net effect is a quicker response, while still providing smooth control and the tuning options that come with varying paddle size & flybar weights.
You can get the Bell/Hiller system now by ordering the Esky CP2 head parts from www.balsapr.com and others.
You could probably also use the Century Hummingbird stuff with a little tweaking. |
