In other words, that's why there are no fairly large fixed pitch RC helicopters out there anymore. In my early nitro heli days, 30 size fixed pitch nitro helis were actually fairly common. They were a bear to hold at a fixed altitude because you were always behind what the heli was doing due to the rotor RPM speed change delays and tail blow out would happen any time you had to give a large speed correction to the rotors why I chose collective pitch to start on.
All fixed pitch RC helicopters now are micro size, and as a result of much less heli and blade mass, fixed pitch can work quite well with these little rascals.
The Blade 70S or Esky F are two good examples. Fixed pitch in other words works fairly well up to RC helicopters that have main rotor diameters up to about 12 inches mm or so. After that, the rotor and helicopter mass starts getting to be too much, and fine lift control is lost because of the delay in rotor speed changes.
Tail blow out tendencies where the tail rotor loses its fight against the main rotor torque also starts to become a big problem on fixed pitch birds this size and larger. The torque spikes are not only greater, but so is the severity in how much they change every time you adjust the speed of the rotors to control your lift.
This all adds up to a very hard working tail rotor that is being pushed to the extremes to hopefully keep the heli from yawing. Poor wind handling immunity is another limitation with fixed pitch RC helicopters. Most fixed pitch helis have a very hard time when the wind picks up because the rotor speed is so slow compared to collective pitch helicopters.
This can result in being lofted up high in the air when even a small gust of wind hits your bird. Slow and changing rotor speed can also give poor cyclic performance. With all that said, here's a neat little fixed pitch heli I recently reviewed that actually handles wind fairly well.
It deals with the tail blow out issues by keeping the rotors spooled at low stick. This would have to be the best performing fixed pitch RC helicopter I've flown to date, but it's still no where near as good as collective pitch. These are the very questions I faced when I began flying helicopters in and I have some definite opinions about both. Fortunately, the product selection in model helicopters has blossomed over the past decade and you will have plenty of good choices.
Making the right choice may mean the difference between becoming a proficient helicopter pilot and being sentenced to Air Hog status for life. Over the years, I have built and flown dozens of helicopters, including fixed-pitch models, micro-sized models and scale mega-choppers as long as seven feet.
Today, I only fly scale helicopters. My travels through the helicopter side of the RC hobby have helped shape my views about the type of helicopter that is most suitable for beginning pilots. After almost giving up on model helicopters because of my choice to try a fixed-pitch and then a micro helicopter, I can confidently say that larger collective-pitch helicopters provide the best platform for a pilot to become proficient with helicopters.
That is not to say that one cannot become expert by beginning with either a fixed-pitch or a micro helicopter. It can be done. But I believe the best chance for success lies with a larger helicopter boasting a full suite of controls. LARGE With the exception of coaxial helicopters, large helicopters are more stable and easier to control than helicopters roughly the size of a T-Rex or smaller. Larger helicopters are easier to see, which allows you to read and react to transmitter inputs more quickly.
Since larger helicopters are less twitchy than smaller ones, you will also find yourself fighting less and flying more with a helicopter that sports a rotor diameter of more than 45 inches.
From an expense perspective, it is possible to spend more on an Align T-Rex setup than a Thunder Tiger Raptor 30 setup. Once you crash your helicopter, getting parts for them can be equally expensive depending on your setup. Oh, and you will crash. It is very useful to embrace that horror before you jump into the heli pool.
Essentially these terms refer to the pitch control of the helicopter. The word pitch refers to the angle of the main rotor blades in relation to the horizontal when they are static i.
OK so far?! When the blades are spinning, however, the word pitch changes to the term Angle of Attack AoA and is referred to in relation to the airflow over the blades, rather than just a static horizontal reference. It's important to note, however, that when comparing FP and CP electric rc helicopters this pitch name only refers to altitude control - cyclic directional control has the same method on each type of heli. Above: Pitch angle becomes Angle of Attack when airflow is introduced over the blades.
Lift generation is the primary result and goal of a spinning rotor blade, and lift can be generated in two ways. The first way is to change the Angle of Attack, and this is done by changing the pitch angle of the blades as they move through the air.
A greater pitch angle greater AoA results in more lift, so the helicopter will rise, and conversely a lesser AoA will result in less lift generation, so the helicopter will descend. The second method is to change the speed of the main rotors, while keeping the AoA constant.
Also, most of the helicopters that are fixed pitch comes in an RTF Ready to Fly set, and usually includes a radio transmitter which won't work on collective pitch models though. However, if you plan to stay in this hobby for a long time and fly in more demanding ways, then perhaps making a bigger investment and getting a collective pitch helicopter will be worth while. Editorials » Technology » Technology ». Most Popular. Understanding the Importance of Registry.
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