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There are a bunch of theories on this subject. Lets see if we can make up one of our own.
Think of throttle as power, and think of pitch as drag or lift. When power is applied, pitch is applied at the same time. If to much main blade pitch is applied in relation to throttle position, then the motor/engine will bog down. If not enough main blade pitch is applied in relation to throttle position, then the motor/engine will overspeed. Tail rotor enters in here as well. When a lot of tail is applied, then that also places a load on the power source. Even during normal flying, your gyro is constantly changing the tail blade pitch to keep it in position depending on conditions (such as wind and relationship to it). That also places a load on the power source.
More simply, if you are going down hill in your car, that sucker wants take off, and you reduce the gas or throttle. If you are going up hill, you increase gas/throttle to get you over the top of the hill.
So, the ideal throttle position in relation to main blade pitch position (and allowing for tail blade pitch position) is such that you have enough power to main blade pitch to get you through the maneuvers you intend to do. If you are just hovering, then your requirements are very limited. You just want that sucker to lift off and hold still (maintain altitude) for the most part and run happy (smooth).
But, if you want to go upstairs (up in the sky) and pull loops, rolls, or 3 dimensional style of flying, then you listen and watch carfully to the blades during their revolution and your power source during the maneuvers you are doing. If your hear it bogging down during certain types of maneuvers, then you adjust throttle/pitch curves to keep your motor/engine from either overspeeding or bogging down in those positions of flight.
In the case of Electric RC Helis, only the throttle cirve needs to be adjusted for head speed. Its a matter of physics. Your motor will only take from the battery pack the amount of juice it needs based on the load you are putting on it. So, always leave your pitch curve totally linear. Thus: 0 - 25 - 50 - 75 - 100. For a normal throttle curve, this will get you started: -0 - 35 - 65 - 85 - 100. For a Idle Up Or Stunt Mode, like this: 80 - 80 - 80 - 80 - 80. There agin, your motor will only take from the battery pack the juice it needs based on the load. Adjust throttle curve upwards in Idle Up or stunt modes if 80% is not enough to pull you through your maneuvers. Expert level pilots will often run Idle Up Throttle Curve at 100% across the board. Thats normal
Now, some of us are limited in power, mechanical set up, main blade pitch, type of gyro, type/weight of main blades, type/weight of tail blades, and many other factors that may not give us the power we need to do the style of flying we want to do. In that case, its best to get someone who has experience with that style of flying so that they can test fly your machine to maximize your throttle/pitch curves do get the most out of the machine you intend to fly. Obviously, you will want trust that individual<G>. In some cases, some of us just simply have to learn to fly with the power we have. Another option would be to spend some bucks on some upgrades to maximize power to weight ratio. There is nothing wrong with either way to approach this.
After all, its a hobby. We can do what we want, spend what we can afford, and fly the style we choose. What the heck, its fun, challenging, and no matter what machine you are flying, its ALL PILOT. No matter what brand or size of Heli we are flying., its up to you.
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