January 18, 2000
QuestChat with Larry Young
Aeromechanics Research Engineer
NASA Ames Research Center, Moffett Field, CA
Tue Jan 18 13:29:36 2000
- 0 - 08:12:23 ]
Thank you for your interest in today's Aerospace Team Online chat with Larry
Young from NASA Ames Research Center. Today's chat is scheduled to occur
at 10:00 a.m. Pacific Daylight Time. Be sure you have read Larry's profile
at http://quest.nasa.gov/aero/team/young.html to
prepare your questions.
- 3 - 09:51:26 ]
Welcome to our early arriving chatters. We will begin today's chat with
Larry Young in approximately 10 minutes. Please stay with us!
- 4 - 09:59:46 ]
Hello and welcome to today's Aerospace Team Online chat with Larry Young
from NASA Ames Research Center.
- 5 - 09:59:55 ]
Larry Young is currently the project manager for the Tilt Rotor Aeroacoustic
Model (TRAM) project. He leads a team of engineering and technical professionals
investigating how to make tiltrotor aircraft as quiet as possible. The
group hopes that one day, tiltrotors can reduce the growing congestion
at our country's airports, and provide service for small or underdeveloped
communities not served by major commercial airlines.
- 6 - 10:00:09 ]
- 7 - 10:00:14 ]
And now, here is Larry Young to answer your questions.
[ Ryan - 8 - 10:00:24 ]
Dear Mr. Young A noise reduced tiltrotor? How much do you think intstalling
your device cost, and will it be worth the trouble?
- 9 - 10:02:27 ]
It's hard at this point to quantify cost to a vehicle. But, my guess is
that anything that adds more than 10% cost isn't likely to be implemented.
As to is it worth it: the answer is yes for a variety of reasons.
- 11 - 10:06:51 ]
For example, Ryan, we are closely looking at using 'active' rotor control
to reduce noise. This entails putting in high frequency control inputs
to the rotors well above the primary rotor control rates. This will entail
adding a low authority, high freq control system to the rotor blades and/or
- 12 - 10:10:31 ]
RE: [Ryan] Dear Mr. Young A noise
reduced tiltrotor? How much do you think intstalling your device cost,
and will it be worth the trouble?
As to why tiltrotor noise reduction is worth it there are several reasons
why it is. First, our hope within NASA is to make civil tiltrotors an
important part of America's future transportation network. Second, from
a military standpoint quiet tiltrotors are harder to detect by opponents.
- 13 - 10:12:20 ]
Larry, while we're waiting for more questions, can you share with us some
of the differences (e.g. travel time, maneuverability) between tilt rotors
and jet engine aircraft?
- 15 - 10:17:05 ]
To give you some reasons why tiltrotors are key to future transportation.
First of all, tiltrotors can almost hover as efficiently as helicopters,
but can fly much faster. Tiltrotors can cruise anywhere from 250 to 300
knots (1 knot is 1.15 mile per hour). Some design studies suggest tiltrotors
can fly up to around 400 knots. A modern turbo-prop airplane flies from
around 300 to 400 knots. A modern commercial jet airplane flies around
- 16 - 10:19:27 ]
RE: [Susan] Hi Larry, Is a tiltrotor louder
than a helicoper?
Hi Susan. A tiltrotor, right now, is louder than most helicopters when
it is hovering and/or taking off or landing. However, it is quieter when
it is flying in cruise (when it's noise level is comparable to a turbo-prop
airplane). Some of the noise reduction work we are doing at NASA will
hopefully reduce tiltrotor noise well below current levels for rotorcraft
as a whole.
- 21 - 10:24:20 ]
Corey, welcome, and thank you for joining us.
- 22 - 10:24:56 ]
RE: [Ryan] Once we acquire this technology
do you think it can be duplicated and used against us?
This (and any) technology is likely to be copied by other countries if
it proves valuable. However, the United States has invested for several
decades in tiltrotor technology. We are well ahead of any other country
as to tiltrotor technology. Further, critical technologies (even those
developed by NASA) can have constraints/conditions applied to them to
minimize information distribution. Competition is generally good, but
everything needs to be weighed by a case by case basis.
- 24 - 10:28:22 ]
RE: [Corey] I like the idea that the blades
can be horizontal or vertical. Who came up with that idea and how is it
Hi Corey. Like a lot of good ideas a number of companies and people arrived
at the same design solution about the same time in the forties and fifties.
But the leader in the practical implementation of tiltrotor technology
has bee Bell Helicopter Textron, in Texas. Bell, through NASA and the
U.S. Army funding and collaboration, has been developing the tiltrotor
flight vehicles since the sixties. Bell and Boeing have put in production
the V-22 Osprey and Bell is on track for selling the Bell Augusta 609
- 25 - 10:30:21 ]
RE: [Susan] Thanks for answering my question
Larry. Does the acoustic remodel of the 40 x 80 wind tunnel help your
Yes Susan. One test alone does not solve a complex problem such as making
a quieter tiltrotor. But the 40-by-80 test and the TRAM project that I
lead are important to the overall problem solving process. TRAM's primary
objective is acquiring high quality critical data to validate design computer
codes for tiltrotors.
- 27 - 10:34:19 ]
RE: [Cassie] Were you nervous the
first time you went to NASA?
You bet Cassie! I came to NASA Ames just out of college. I hadn't ever
lived outside Washington State before. Coming to the San Francisco Bay
Area and Silicon Valley was a big change for me. I work closely with the
National Full-Scale Aerodynamics Complex (40-by-80 and 80-by-120 Foot
Wind Tunnels). These tunnels are huge. The six fan drives are 25 foot
in diameter. It can consume 100 Mega-Watts of power -- enough to power
a small town. Yes, I was nervous. But a lot of good things in life make
you nervous the first time you do them.
- 29 - 10:39:30 ]
RE: [Clayton] Is there a button to push
while the pilot is in flight, so tha the blades can switch from horizontal
Hi Clayton. Yes, there are some very sophisticated fly-by-wire controls
in modern tiltrotor aircraft -- such as the V-22 Osprey and the BA 609.
Flight controls development is a major technical discipline within aeronautics
and rotorcraft. Noise reduction devices and flight path management will
in the future further increase the complexity of tiltrotor flight controls.
- 30 - 10:40:33 ]
At the conclusion of today's chat, we ask that you share your comments
with us at http://quest.nasa.gov/qchats. We look
forward to hearing from you!
- 32 - 10:47:42 ]
RE: [Oran/NASAChatHost] Larry, what would you say has
been most fulfilling for you in your career with NASA so far?
Several things actually. But the two most fulfilling aspects of my job
are solving complex problems and working with the hardworking, dedicated
civil servants and contractors within the NASA system.
- 34 - 10:51:01 ]
If anybody would like to talk about some of the work I've been doing recently
looking at vertical lift planetary aerial vehicles (for example flying
on Mars), I'd be happy to. You can also look at my field journal on the
- 35 - 10:52:31 ]
RE: [LarryYoung/ARC] If anybody would like to talk about
some of the work I've been doing recently looking at vertical lift planetary
aerial vehicles (for example flying on Mars), I'd be happy to. You can
also look at my field journal on the Quest site.
Larry's field journals are located within his online profile, at http://quest.nasa.gov/aero/team/young.html
- 36 - 10:54:33 ]
This concludes today's Aerospace Team Online chat with Larry Young from
NASA Ames Research Cneter. We would like to thank everyone for joining
us today, along with Larry Young for sharing his career experience with
- 37 - 10:55:11 ]
Well, it's been fun. I hope everybody enjoyed themselves, and learned
something as well.
- 38 - 10:55:55 ]
We invite you to join us for our next ATO chat with Gavin Botha from NASA
Ames Research Center, on Tuesday, February 1 at 10:30 a.m. Pacific Standard
- 39 - 10:56:25 ]
A final reminder to send your thoughts about today's chat with us, at
http://quest.nasa.gov/qchats. Thank you again to
everyone for joining us today. Have a good day.