![](images/dotclear.gif)
Selected
photos from:
Douglas
DC-3
Re-engine STC Project
In
this project, Pratt and Whitney PT6-67R turbo-prop engines were installed
in a Douglas DC-3, requiring a 40 inch fuselage stretch to maintain
proper CG. Alligator was responsible for all aspects of test equipment
installation and data acquisition for the program (80+ channel digital
low to- moderate-speed and 10 channel high-speed analog/digital hybrid
data acquisition systems). (October 1988 through February 1990)
![](images/dc3/DC-3_3.jpg)
Mounting flight test
boom on wingtip of DC-3 to measure pitot
pressure, static pressure, angle of attack and angle of side-slip
![](images/dc3/DC-3_12.jpg)
Modifying airframe
to receive Pratt & Whitney PT6-67R turbo-prop engines
![](images/dc3/DC-3_13.jpg)
![](images/dc3/DC-3_15.jpg)
Mounting 5-bladed
propeller
![](images/dc3/DC-3_4.jpg)
![](images/dc3/DC-3_9.jpg)
Fitting new rear
cowl section
![](images/dc3/DC-3_1.jpg)
Aircraft ready for
test flights
![](images/dc3/DC-3_10.jpg)
Strain gauges mounted
on propeller for vibration survey tests
![](images/dc3/DC-3_11.jpg)
Close-up of strain
gauges
![](images/dc3/DC-3_14.jpg)
String potentiometers
for measuring elevator position and rudder position
![](images/dc3/DC-3_17.jpg)
String pot for main
gear strut deflection measurement
![](images/dc3/DC-3_7.jpg)
Alligator-designed
and fabricated load cells for measuring pilot rudder forces
![](images/dc3/DC-3_6.jpg)
Data acquisition
system developed by Alligator for LaCadre flight test department
![](images/dc3/DC-3_2.jpg)
Basler turbo-prop
DC-3 climbing out on first flight test
![](images/dc3/DC-3_18.jpg)
Camera theodolite
system used for measuring take-off and landing distances.
Computer recorded data used and coordinated with airborne data system.
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