Informed Decision: Fixed Pitch and Collective Pitch RC Helis
Pitch is what allows a helicopter to fly. Simply put, pitch is the angle of the rotor blade. When the rotor spins, the angle of the blades is what generates lift. As if this were not hard enough to understand, the confusing 'fixed pitch' and 'collective pitch' labels given to RC helicopters are enough to make ones head spin. Each pitch type has its benefits, but understanding the difference between the two is important so you can figure out which is the best for you.
Fixed pitch is true to its name: The blades are fixed at certain angles and lift is controlled solely by engine speed. Faster speeds generate more lift; slower speeds generate less lift, like when you bring the helicopter down. Collective pitch, on the other hand, allows for the blade pitch to be changed in-flight. Thus, a collective-pitch helicopter has greater lift control and flight versatility.
Choosing the right pitch type for your needs will take an examination of your skill level and dedication to the hobby. Fixed pitch helicopters are generally less expensive. Because they have fewer controls and moving parts they are easier to learn and cheaper to repair. Unfortunately, however, you can only do so much with a fixed pitch helicopter. They don't have the flexibility to do stunts or certain advanced maneuvers, and, since their movement is relying on the speed of the engine there tends to be a delayed response to your commands.
Collective pitch helicopters are more expensive and more demanding to fly than fixed pitch helis. Due to the parts allowing for pitch adjustment, they are more difficult to build and repair. The transmitter is also more complex, so these helis definitely have a greater learning curve. The trade-off is fair, as collective pitch helis can be much more exciting to fly. They have the agility to do anything you want them to, including flips, loops, stall turns or any other maneuver you can imagine. The command response is precise enough to allow for safe indoor and outdoor flight. Even if the engine stalls out in the middle of a flight, the heli can still be landed safely by adjusting the blades to a negative pitch.
Some hobbyists claim that fixed pitch helis are best for beginners, but beginners won