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radio-controlled model aircraft flying

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radio-controlled model aircraft flying
 

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radio-controlled model aircraft flying
is one of america's most popular hobbies

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is one of america's most popular hobbies
 

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is one of america's most popular hobbies
the people who fly these small-scale

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the people who fly these small-scale
 

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the people who fly these small-scale
versions of their favorite planes have

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versions of their favorite planes have
 

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versions of their favorite planes have
many reasons why they are interested

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many reasons why they are interested
 

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many reasons why they are interested
some like the excitement of flying some

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some like the excitement of flying some
 

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some like the excitement of flying some
like building them

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like building them
 

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like building them
and some just enjoy the camaraderie

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engineers at nasa's dryden flight

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engineers at nasa's dryden flight
 

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engineers at nasa's dryden flight
research center in california

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research center in california
 

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research center in california
use radio control aircraft for another

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use radio control aircraft for another
 

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use radio control aircraft for another
reason research

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reason research
 

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reason research
they know that meaningful data can be

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they know that meaningful data can be
 

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they know that meaningful data can be
obtained from radio controlled aircraft

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obtained from radio controlled aircraft
 

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obtained from radio controlled aircraft
they are using a 15 percent model of

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they are using a 15 percent model of
 

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they are using a 15 percent model of
dry-in zone f-18

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dry-in zone f-18
 

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dry-in zone f-18
high alpha research vehicle that has

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high alpha research vehicle that has
 

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high alpha research vehicle that has
been built as a proof-of-concept

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been built as a proof-of-concept
 

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been built as a proof-of-concept
platform to conduct aerodynamic research

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the model was made at dryden almost

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the model was made at dryden almost
 

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the model was made at dryden almost
exclusively from standard rc model

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exclusively from standard rc model
 

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exclusively from standard rc model
industry equipment

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industry equipment
 

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industry equipment
like this aeron servo but a number of

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like this aeron servo but a number of
 

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like this aeron servo but a number of
modifications had to be made in order to

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modifications had to be made in order to
 

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modifications had to be made in order to
meet research specifications

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meet research specifications
 

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meet research specifications
the fuselage made of fiberglass comes

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the fuselage made of fiberglass comes
 

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the fuselage made of fiberglass comes
from an off-the-shelf model kit

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from an off-the-shelf model kit
 

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from an off-the-shelf model kit
the wings and tail surfaces are made out

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the wings and tail surfaces are made out
 

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the wings and tail surfaces are made out
of a styrofoam core and sheeted with

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of a styrofoam core and sheeted with
 

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of a styrofoam core and sheeted with
balsa wood

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entirely new engine inlets and exhaust

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entirely new engine inlets and exhaust
 

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entirely new engine inlets and exhaust
stucks were made in order to more

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stucks were made in order to more
 

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stucks were made in order to more
accurately represent

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accurately represent
 

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accurately represent
the true f-18 inlet configuration

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the true f-18 inlet configuration
 

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the true f-18 inlet configuration
this included functional boundary layer

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this included functional boundary layer
 

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this included functional boundary layer
diverters

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diverters
 

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diverters
stress carrying bulkheads made of a

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stress carrying bulkheads made of a
 

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stress carrying bulkheads made of a
special laminate of end grain balsa wood

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special laminate of end grain balsa wood
 

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special laminate of end grain balsa wood
and fiberglass

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and fiberglass
 

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and fiberglass
had to be installed to handle the

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had to be installed to handle the
 

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had to be installed to handle the
stresses encountered by the model in

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stresses encountered by the model in
 

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stresses encountered by the model in
flight

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some parts like the stabilator pivot

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some parts like the stabilator pivot
 

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some parts like the stabilator pivot
mechanism were made by hand

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mechanism were made by hand
 

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mechanism were made by hand
other types of material used were

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other types of material used were
 

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other types of material used were
plywood carbon fiber and balsa wood

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plywood carbon fiber and balsa wood
 

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plywood carbon fiber and balsa wood
the model's thrust comes from two

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the model's thrust comes from two
 

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the model's thrust comes from two
commercially available ducted fan units

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commercially available ducted fan units
 

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commercially available ducted fan units
that are 85 percent efficient in

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that are 85 percent efficient in
 

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that are 85 percent efficient in
converting horsepower to thrust

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converting horsepower to thrust
 

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converting horsepower to thrust
two model airplane engines power the fan

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two model airplane engines power the fan
 

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two model airplane engines power the fan
units producing 11 pounds of static

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units producing 11 pounds of static
 

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units producing 11 pounds of static
thrust each

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the plane has been tracked on radar at

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the plane has been tracked on radar at
 

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the plane has been tracked on radar at
160 knots a speed which should be

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160 knots a speed which should be
 

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160 knots a speed which should be
increased with the installation of

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increased with the installation of
 

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increased with the installation of
liquid propane fuel mini turbo jets

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liquid propane fuel mini turbo jets
 

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liquid propane fuel mini turbo jets
thrust vectoring vanes have been added

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thrust vectoring vanes have been added
 

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thrust vectoring vanes have been added
to the model to make it true to the real

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to the model to make it true to the real
 

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to the model to make it true to the real
aircraft but are not operational

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aircraft but are not operational
 

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aircraft but are not operational
however an operational system has been

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however an operational system has been
 

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however an operational system has been
designed for a future project

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designed for a future project
 

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designed for a future project
the plane is fully instrumented to

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the plane is fully instrumented to
 

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the plane is fully instrumented to
measure air speed angle of attack

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measure air speed angle of attack
 

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measure air speed angle of attack
side slip and control surface positions

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side slip and control surface positions
 

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side slip and control surface positions
three axis rate gyros measure the rate

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three axis rate gyros measure the rate
 

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three axis rate gyros measure the rate
of rotation

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of rotation
 

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of rotation
and three accelerometers measure the

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and three accelerometers measure the
 

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and three accelerometers measure the
g-forces experienced by the model in

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g-forces experienced by the model in
 

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g-forces experienced by the model in
flight

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flight
 

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flight
it took six months to build at a cost of

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it took six months to build at a cost of
 

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it took six months to build at a cost of
approximately twenty five thousand

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approximately twenty five thousand
 

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approximately twenty five thousand
dollars

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dollars
 

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dollars
these modifications make it truly

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these modifications make it truly
 

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these modifications make it truly
capable performing as a flight research

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capable performing as a flight research
 

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capable performing as a flight research
vehicle

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vehicle
 

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vehicle
like its full-scale big brother rc

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like its full-scale big brother rc
 

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like its full-scale big brother rc
subscale models like this have a unique

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subscale models like this have a unique
 

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subscale models like this have a unique
quality that allows researchers to

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quality that allows researchers to
 

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quality that allows researchers to
gather aerodynamic data

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gather aerodynamic data
 

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gather aerodynamic data
which is difficult and expensive to

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which is difficult and expensive to
 

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which is difficult and expensive to
obtain in wind tunnels

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obtain in wind tunnels
 

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obtain in wind tunnels
models like this are especially suited

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models like this are especially suited
 

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models like this are especially suited
for getting aerodynamic data

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for getting aerodynamic data
 

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for getting aerodynamic data
like performing parameter identification

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like performing parameter identification
 

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like performing parameter identification
studies and for confirming the basic

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studies and for confirming the basic
 

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studies and for confirming the basic
airworthiness of unique

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airworthiness of unique
 

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airworthiness of unique
aircraft configurations research and

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aircraft configurations research and
 

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aircraft configurations research and
advanced control theory can also be done

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advanced control theory can also be done
 

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advanced control theory can also be done
by using existing technology

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by using existing technology
 

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by using existing technology
a flight control computer can be

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a flight control computer can be
 

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a flight control computer can be
installed that would allow the aircraft

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installed that would allow the aircraft
 

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installed that would allow the aircraft
to gather data at specific flight

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to gather data at specific flight
 

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to gather data at specific flight
conditions

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conditions
 

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conditions
radio-controlled model aircraft flying

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radio-controlled model aircraft flying
 

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radio-controlled model aircraft flying
is a great hobby but for nasa's dryden

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is a great hobby but for nasa's dryden
 

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is a great hobby but for nasa's dryden
flight research center

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flight research center
 

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flight research center
they are just another innovative tool in

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they are just another innovative tool in
 

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they are just another innovative tool in
advancing their frontiers of flight

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research

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you