Right. I’ve had the helicopter itch for a long time.
I don’t know when it started, exactly, but once I finished my instrument rating, and I realized that it wouldn’t actually bankrupt me, I decided to make it happen.
Today was my first lesson in the Robinson R44. Most people, myself more or less among them, come from the school of thought that believes that helicopters are basically designed in the factory to kill you.
So imagine my surprise when, three minutes after take-off, I am responsible for all four (or three, depending on how you look at it) controls and we’re heading directly for downtown Boston.
The actual flying turned out not to be very difficult — at least for this instrument-rated airplane pilot. My new instructor says that this is very common, that instrument pilots are quick studies, because they are already very sensitive to the attitude of the aircraft.
Small movements of the controls. This is the key.
The flying I found pretty easy. It was definitely made easier by the fact that this helicopter has a governor.
To explain the governor, it would help to first explain the four fundamental helicopter controls: collective, throttle, cyclic, and anti-torque.
The collective changes the pitch angle of all the main rotor blades. When you raise the collective, you’re causing the blades to impact the air at a larger angle. Basically, when you raise the collective and increase the blade angle, you’re commanding the ship to rise.
The cyclic control tilts the entire main rotor assembly, which changes the direction of thrust. For example, if you push the cyclic forward, you tilt the blades forward, which causes more thrust towards the rear of the ship, and the helicopter moves forward.
The throttle controls how much power is delivered by the engine. All else being equal, higher throttle means the blades spin faster and generate more thrust. If that thrust is pointed upward, you rise. If it’s pointed forward, you move forward faster.
Finally, the anti-torque rotor offsets the effects of Newton’s third law. You know Newton’s third? Equal and opposite?
Well, when the engine turns that main rotor, it’s effectively pushing against the body of the helicopter. The body wants to turn in the opposite direction, and the tail, or anti-torque, rotor pushes back. You use that rotor — controlled with foot pedals — to control left and right yaw.
OK, we’ve made it through that. So what does the governor do?
Well, when you raise the collective, and increase the blade angle, it’s harder for the blades to turn — higher angle means they’re pushing against more air, and trying to generate more lift.
All else being equal, if you increase blade angle, the rotor speed will decrease. Or to turn it around, if you want to maintain the same rotor RPM, you need to increase the amount of power (throttle).
That’s what the governor does: when you increase the blade angle, it automatically increases the power to maintain the same RPM. This is huge, because it basically removes the throttle from the picture, and means you only have to deal with three controls instead of four.
Finally, that’s behind us. If you are unbelievably interested in the principles of rotorcraft flight, I recommend the FAA’s Rotorcraft Flying Handbook, available at no charge courtesy of The Internet!
I seemed to be doing well with the controls in straight-and-level flight, so my instructor decided we could do the rest of our lesson over downtown. The city tour was an excellent introduction to the joys of helicopter flight.
We flew over Harvard and MIT, Fenway and the waterfront, and I was able to get a real feel for how to control the helicopter at various airspeeds, altitudes, and bank angles. It is apparently possible to do this same tour in a fixed-wing aircraft, but two important considerations make it impractical.
First, it would be illegal at our altitude. Helicopters are allowed to fly much closer to ground obstacles than fixed-wing aircraft. To put it in some perspective, I flew by the Prudential Center at about 2/3 of its height, close enough that the noise echoing off of the building caused some mild radio interference. Think about that.
Second, you can only slow a fixed-wing aircraft down so much. Slowing a helicopter too much can be dangerous, but at least it’s an option when you’re in close quarters with tall buildings. It is never an option in a fixed-wing airplane.
After our Boston city tour it was back to Hanscom for some hovering practice. Among my greatest achievements in life, this first attempt at hovering was not among my top ten solid gold hits.
I was told later that holding the hover for twenty seconds was, in fact, a tremendous accomplishment — that most people last five or maybe ten — but it didn’t feel that way at the time. There were very few instances during airplane training when the instructor had to take the controls, but I imagine this is something I will get used to.
In summary, however, lest you get an impression that is at all shy of accurate: helicopters are one thousand percent awesome, and I eagerly await tomorrow’s lesson.
Flying time: 1.1 hours
OBLIGATORY ACTION SHOT