The Hurricane Hunters

by Ivan Ray Tannehill

No one at that time would have believed it possible for this situation to be reversed. Instead of waiting to be sure that the weather is favorable, planes now assigned to hurricane hunting wait to be sure the weather out there somewhere is decidedly unfavorable before they take off in that direction. But even in hurricane hunting the unexpected happens and, as in the old days, the crews are intensively trained and all precautions are taken so that they are not likely to be caught by surprise in an emergency. In a period of years there are hundreds of missions into dozens of tropical storms and, unfortunately, a few have met with disaster. So the intensive training goes on without interruption.

It seems strange but it is a fact that some men fly into hurricanes and typhoons without seeing much of what is going on outside the plane. They are too busy with their jobs to spend time looking around. In the first year some of them learn more about these big storms before and after missions than they do while flying. There are lists of reading matter to be consulted, including books and papers on tropical storms, and there are hints, suggestions, advice and warnings based on the experiences of other men. Also, they read the reports that usually are gathered from the members of other crews after their flights are finished. At the end of the season, all these pieces of information may be assembled in a squadron report, with recommendations. New men are expected to study this material. Before each flight, the crew gathers in front of a large map for a “briefing.” Here an experienced weather officer shows them a weather map, points out the location and movement of the storm center at the last report, and indicates the route that seems most favorable for an approach to the storm area and for the dash into its center.

Most of this training is aimed at the development of crews that will be ready for any emergency—for the “unexpected,” so far as that can be realized. Their performance in recent years shows that this special training enables them to survive most of the frightening experiences which probably would be disastrous to crews on less spectacular types of missions.

Usually there has been separate training for the men most concerned with each of several jobs—weather, hurricane reconnaissance, engineering, communications, navigation, photography, radar and maintenance. Before departure, the ground maintenance men see that the plane is in good working order and that the equipment is operating properly. At the beginning of each season, for example, some of the Navy maintenance men get the city to turn the fire hose at high pressure into the front of the plane, to see how it reacts. The effects of torrential rains in high winds of the storm are simulated in this manner. After every flight, the plane needs very thorough examination. One of the troubles is that salt air at high speed causes rapid corrosion. Salt may accumulate around the engines. Also, severe turbulence causes damage to the plane.

After the take-off, the pilot and co-pilot can see what is ahead most of the time, but for considerable intervals they are on instruments, or, as they say in the Navy, “on the gauges.” They see nothing or very little of what is ahead of the plane in such cases and, the sea surface being hidden from view, they are uncertain as to their altitude until the weather officer, or aerologist, gives them a reading from the radar altimeter. Sometimes in darkness a pilot has had the bright lights turned on so that a flash of lightning will not leave him completely blinded at a time when he must know what the instruments show because of the violent turbulence that may be experienced when there is lightning. Then, too, they always have in mind that there may suddenly be torrential rain that will lower the cylinder head temperatures to a dangerous level. They must accelerate and heat the engines without traveling too fast. The landing gear is dropped to catch the wind. By using a richer mixture to feed the engines, the cooling effect may be lessened. It is always necessary to be on the alert. Altogether, it is just as important, and oftentimes more so, for the men to see the gauges than to see the weather.

Although the Air Force and Navy have different methods of flying into tropical storms, there are certain dangers that are common to both systems. Ahead of time, the pilots and others make a last-minute check to see that the crew are prepared. They also check instruments, lights, pitot and carbureter heat, safety belts, power settings, emergency equipment, current for communications and radar, and other things. In flight, the pilot does not use the throttle unnecessarily, but chiefly to maintain air speed. Actually it may be said that there are three pilots. The third one, sometimes known as “George,” is the auto-pilot, which may do most of the flying, except in rough weather and in landing and take-off. Keeping the plane on course on a long flight would be very tiring otherwise. The limits of air speed vary. In the B-29’s, which have been used generally for Air Force hunting, the limits are between 190 and 290 miles an hour, roughly. Air-speed readings may be affected by heavy rain. Also, increased humidity of the air will result in an increase in fuel consumption. There are numerous other items on the list of things that may cause trouble. But the pilots are highly competent and thoroughly trained and experienced before being put on the hurricane detail.

The radio operator, of course, is fully occupied and seldom has much time to see what is going on in the weather. He has two main troubles. One is static. When it is bad, all he can do is send a message blind and ask the ground station to wait. This may last for an hour or more. Various devices are used to reduce static interference but without complete success. As soon as the plane starts bouncing around, he has difficulty keying the message, not only because his body is shaking and swaying, but because it produces variations in the transmitter voltage and, on very high frequency, a drop below a certain critical voltage is likely to render the equipment inoperative.

To overcome a little of the trouble from turbulence, some radio operators in the early days tried strapping one arm to the desk, but one radio man, having just experienced a rough flight, said in his report that his arm didn’t do a very good job unless he was there! Besides, he needed the arm to hold on with. More recently, it has been necessary to carry two radio men, and in fact this has become standard practice in most areas in the last year or two. It is very seldom that communications fail entirely but a plane on a storm-hunting mission that was out of contact with the ground station for much over an hour usually returned to base. Some aircraft on storm missions carry extra receivers and transmitters.

One navigator interviewed said that he is as busy as a one-armed paper hanger. He keeps track of the position of the plane by dead reckoning and by loran, which is “long range navigation,” accomplished by receiving pulsed signals from pairs of radio stations on coasts or islands. It works well in the center of the storm, not so well elsewhere; in some parts of the hurricane belt, loran coverage has been poor. If it fails, the plane may go out to a point where the navigator can get a good fix by loran and do the dead reckoning from the center to this point.

Every few minutes, the navigator writes in his log a note about drift, compass heading, indicated air speed and time, and when it is rough bumps his head on the eye piece of the drift meter, the radar or something else. He takes double drift readings to get the speed of the strongest winds, figures the diameter of the eye and the exact location of the aircraft while in the eye, and passes this information to the weather officer or aerologist for his report. The duties are so numerous that the Navy usually carries two navigators “to produce pinpoint accuracy with limited celestial or electronic aids while being buffeted by one hundred-knot winds.” Two are required largely because of frequent changes in heading and the nature of the winds in the Navy low-level style of reconnaissance. The Air Force uses two on daily weather reconnaissance and sometimes on storm missions.