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since its introduction three decades ago

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since its introduction three decades ago
 

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since its introduction three decades ago
the helicopter has been a valuable

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the helicopter has been a valuable
 

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the helicopter has been a valuable
national asset

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more recently the tilt rotor aircraft

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more recently the tilt rotor aircraft
 

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more recently the tilt rotor aircraft
has demonstrated it can do almost

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has demonstrated it can do almost
 

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has demonstrated it can do almost
everything the helicopter does and more

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everything the helicopter does and more
 

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everything the helicopter does and more
including flying like a fixed-wing plane

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including flying like a fixed-wing plane
 

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including flying like a fixed-wing plane
once airborne

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as our airports and air space become

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as our airports and air space become
 

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as our airports and air space become
more congested and the demand for

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more congested and the demand for
 

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more congested and the demand for
short-range commuter flights grows the

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short-range commuter flights grows the
 

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short-range commuter flights grows the
appeal of rotorcraft is becoming greater

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appeal of rotorcraft is becoming greater
 

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appeal of rotorcraft is becoming greater
but current systems are too noisy burn

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but current systems are too noisy burn
 

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but current systems are too noisy burn
too much fuel and require expensive

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too much fuel and require expensive
 

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too much fuel and require expensive
maintenance

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maintenance
 

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maintenance
it is problems like these which nasa's

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it is problems like these which nasa's
 

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it is problems like these which nasa's
ames research center in mountain view

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ames research center in mountain view
 

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ames research center in mountain view
california is studying

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california is studying
 

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california is studying
here engineers use wind tunnels to carry

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here engineers use wind tunnels to carry
 

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here engineers use wind tunnels to carry
out aerodynamic tests similar to those

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out aerodynamic tests similar to those
 

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out aerodynamic tests similar to those
done on conventional planes and

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done on conventional planes and
 

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done on conventional planes and
automobiles

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automobiles
 

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automobiles
a rotor blade section is mounted in

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a rotor blade section is mounted in
 

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a rotor blade section is mounted in
front of a sophisticated instrument

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front of a sophisticated instrument
 

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front of a sophisticated instrument
called a laser velocimeter or lv

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called a laser velocimeter or lv
 

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called a laser velocimeter or lv
once setup is complete air along with a

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once setup is complete air along with a
 

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once setup is complete air along with a
fine oil mist is blown through the

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fine oil mist is blown through the
 

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fine oil mist is blown through the
tunnel

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tunnel
 

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tunnel
tiny oil particles reflect light back

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tiny oil particles reflect light back
 

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tiny oil particles reflect light back
into the air

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into the air
 

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into the air
allowing researchers to determine how

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allowing researchers to determine how
 

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allowing researchers to determine how
fast air flows around any area of the

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fast air flows around any area of the
 

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fast air flows around any area of the
blade being tested

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blade being tested
 

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blade being tested
related work is underway at the ames

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related work is underway at the ames
 

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related work is underway at the ames
outdoor aerodynamic research facility

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outdoor aerodynamic research facility
 

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outdoor aerodynamic research facility
in this particular study engineers are

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in this particular study engineers are
 

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in this particular study engineers are
investigating how certain aerodynamic

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investigating how certain aerodynamic
 

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investigating how certain aerodynamic
characteristics of rotor systems

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characteristics of rotor systems
 

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characteristics of rotor systems
influence overall performance according

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influence overall performance according
 

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influence overall performance according
to the chief of the rotary wing

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to the chief of the rotary wing
 

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to the chief of the rotary wing
aeromechanics branch at ames ten percent

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aeromechanics branch at ames ten percent
 

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aeromechanics branch at ames ten percent
of a rotor system's total energy is

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of a rotor system's total energy is
 

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of a rotor system's total energy is
wasted because downward forces generated

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wasted because downward forces generated
 

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wasted because downward forces generated
by the spinning blades push other parts

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by the spinning blades push other parts
 

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by the spinning blades push other parts
of the aircraft towards the ground bill

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of the aircraft towards the ground bill
 

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of the aircraft towards the ground bill
warnbrook

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warnbrook
 

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warnbrook
consequently the rotor system has to

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consequently the rotor system has to
 

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consequently the rotor system has to
work 10

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work 10
 

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work 10
harder

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harder
 

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harder
to develop an equivalent amount of lift

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to develop an equivalent amount of lift
 

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to develop an equivalent amount of lift
say to lift

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say to lift
 

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say to lift
a crew and useful cargo complementing

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a crew and useful cargo complementing
 

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a crew and useful cargo complementing
these experimental studies are computer

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these experimental studies are computer
 

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these experimental studies are computer
simulations when a blade rotates it is

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simulations when a blade rotates it is
 

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simulations when a blade rotates it is
constantly colliding with tornado-like

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constantly colliding with tornado-like
 

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constantly colliding with tornado-like
pockets of turbulence created by other

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pockets of turbulence created by other
 

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pockets of turbulence created by other
blades in front of it the result is less

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blades in front of it the result is less
 

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blades in front of it the result is less
efficiency and greater noise

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efficiency and greater noise
 

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efficiency and greater noise
simulations like these cut costs by

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simulations like these cut costs by
 

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simulations like these cut costs by
allowing researchers to study

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allowing researchers to study
 

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allowing researchers to study
aerodynamic problems before building the

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aerodynamic problems before building the
 

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aerodynamic problems before building the
final aircraft

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nasa's rotorcraft research an approach

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nasa's rotorcraft research an approach
 

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nasa's rotorcraft research an approach
aimed at improving the performance of

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aimed at improving the performance of
 

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aimed at improving the performance of
future transport systems