Because of this expertise, I have helped with various wind tunnel projects here at Ames including the 12' wind tunnel renovation project and testing for a new National Wind Tunnel Complex which was proposed a few years ago, but later canceled. I have written articles which give "design rules" for small low-speed wind tunnels.

As an offshoot, during the last couple of years I was at Imperial College, we started doing some wind tunnel research on cricket ball aerodynamics --- basically, a study of why a cricket ball curves through the air (much like a curveball in baseball) and what parameters can affect its flight. That is how I got started in this exciting field. After I moved to California, I also looked at the aerodynamics of baseballs, golf balls and volleyballs and I have recently participated in a project on tennis balls. I am familiar with all kinds of sports balls and their aerodynamics and I have written several articles on the subject.

My Career Journey
I was born in Nairobi, Kenya, which lies on the east coast of Africa. I went to high school and beyond in England. I came to NASA as a National Research Council Postdoctoral Fellow in 1981 after which I stayed on as a contractor through Stanford University. I was hired by Ames as a Senior Research Scientist in December 1996. The person who influenced me the most towards where I am today is my graduate advisor, Peter Bradshaw, who is now at Stanford.

A research interest that I pursued at Ames initially revolved around the experimental study of streamwise vortex/boundary layer interactions. This led to a deep interest in the three-dimensional structure of free-shear layers, such as mixing layers and wakes. We conducted a series of experiments in a specially designed wind tunnel over a period of about 10 years.

Later on I became involved in research on a relatively new measurement technique which uses special paints to measure pressures on a model surface. The surface pressures are extremely important because they give the lift and drag forces on the model and they can also indicate design problems. The paint is excited by a special light source, and by measuring the intensity of the emitted light, we can determine the pressures on the model. High-grade scientific CCD cameras are used to image the surface and the data are then processed on work stations. This technique will hopefully replace the old technique which consists of drilling tiny little holes on the model and then connecting them to pressure transducers, a procedure which is very time consuming and costly. Since 1998, I have been involved more in the management of our experimental group.

Career Likes and Dislikes
The main positive part is that in a research career you can work independently and there is the opportunity of doing what you want. You come up with new ideas or new ventures, and within reason, you can pursue them. I have been lucky enough to be able to do that for most of my research life. There is the sense of a challenge to uncover something that has not been uncovered before. Also, I love the fact that we do not have to dress up (in suits) every day. The main concern is that with research budgets constantly under pressure and the high cost of living in this area, it will be harder to draw young researchers, which does not bode well for the future.

The Early Years
At the risk of sounding corny, I have loved planes since I was a little kid. My interest was maintained partly by looking at books and partly by going to the Nairobi airport to watch planes takeoff and land. Like many small boys, my real dream was to become a commercial airline pilot. However, once I joined the Royal Air Force as a reserve (while I was in college) I soon realized that the only fun-flying was in fact as an air force pilot and that commercial flying would be awfully boring (worse than driving a bus!). The thought of leading a regimented life in the armed forces, however, did not appeal to me and I decided to pursue a career in aeronautics research.

Advice
Nowadays, there are a lot of opportunities for early learning in this field. A great way to start is by browsing on the Internet --- just like you are right now! Another thing kids can do is go to science and aeronautics museums. The Exploratorium in San Francisco has some excellent fluid flow exhibits, and I just recently visited a super aeronautics museum in Seattle, where Boeing resides. Building and flying model airplanes is also a great way to get an introduction to aerodynamics while having lots of fun at the same time. Concentrating on math and science while in school will help enormously in any engineering related career.

Personal Information
I have a wonderful wife, Beena, who is a laboratory technologist (yes, the medical person with a needle that kids are not too fond of) and she works at a lab in Mountain View. We have one son, Shalin, who is studying at the University of Arizona in Tucson. In complete contrast to his fatherÕs career, he is working towards a degree in Management Information Systems in the Business School. Shalin loves to play ice hockey and golf --- unfortunately, he did not take a liking to cricket, a sport I played for most of my life. My wife and I love all sports and we also like to go camping and hiking. I don't play cricket any more, but I enjoy playing golf with my son. I just wish my game was more consistent, just like millions of other weekend golfers!

Archived QuestChats with Rabi Mehta

• January 26, 1999
• April 2, 1998