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Model Testing
Model Test program
Ground and Taxi Trials (coming soon)
Iroquois Engine Testing on a B-47 (coming soon)
Model Testing
During the design, development and construction of the Arrows, testing was
carried out using models, wind tunnel testing, and using Nike rocket
boosters. Over seventeen models which ranged in scale from 1/80 to 1/6
scale were tested from low speed to twice the speed of sound.
Wind tunnels used for testing were:
- the low speed wind tunnel at National Research Council (NRC) Ottawa,
Ontario;
- high speed model testing at Cornell Aeronautical Laboratories, Buffalo
New York;
- transonic and supersonic testing at National Advisory Committee for
Aeronautics, Langley Field, Virginia; and;
- air intake tests at NACA Lewis Laboratories, Cleveland, Ohio.
Wind tunnel testing had their limitations, therefore AVRO fired
free-flight models on Nike rocket boosters to simulate supersonic speeds
at high altitudes. Nine (9) models were fired from Point Petre, near
Belleville, Ontario and two (2) at the NACA range in Virginia.
Average flight time of these models were just under 30 seconds. At 50,000
lbs of thrust, it took 3.2 seconds to reach Mach 1.7. There was only about
8 seconds of supersonic flight time and the models would drop into Lake
Ontario about 5-6 miles out.
Over the years, searches have been made to locate and recover the models
from Lake Ontario.
See Articles for news reports on the
progress.
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MODEL TESTING PROGRAM |
| Model |
Purpose |
Facility |
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(a) Wind Tunnel |
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| 3/100 complete model |
Stability & Control
(Sub & Supersonic) |
Cornell 3' x 4'
and 10' x 12' |
| 4/100 complete model |
Stability & Control
Armament Forces
(Sub & Supersonic) |
Cornell 3' x 4' |
| 1/10 & 1/8 Reflection Plane |
Icing Conditions (Low Speed) |
N.A.E. 10' x 5.7' |
| 7/100 complete model |
Canopy & Missiles
Jettison, Ground Effects
(Low Speed) |
N.A.E. 10' x 5.7' |
| 1/80 complete model |
Stability & Control (Supersonic) |
N.A.E. 16" x 30" |
| 1/40 Fuselage Intake |
Intake Flow (Supersonic) |
N.A.E. 10" x 10" |
| 1/50 Reflection Plane |
Stability & Control (Supersonic) |
N.A.E. 16" x 30" |
| 1/24 complete model |
Spin Characteristics (Subsonic) |
N.A.E. Spinning Tunnel |
| 1/6 Fuselage Intake |
Intake Study
(Sub & Supersonic) |
NACA Cleveland 8' x 6' |
| 3/100 complete model |
Directional Stability
(Supersonic) |
NACA Langley 4' x 4' |
| 1/30 Canopy model |
Rake Survey (Subsonic) |
N.A.E. 10" x 10" |
| 1/10 complete model |
Flutter (Low Speed) |
N.A.E. 10' x 5.7' |
| 1/40 Reflection Plane |
Flutter (Transonic) |
M.I.T. 22" dia. |
| 4/100 Fin Model |
Rudder Buzz (Supersonic) |
N.A.E. 16" x 30" |
| 4/100 complete model |
Missile Trajectories, Canopy Hinge Moments and
Stability Effects (Transonic) |
Cornell |
| l and b
Vane Full Size |
Functional Tests (Supersonic) |
N.A.E. 16" x 30" |
| |
|
|
| |
(b) Water Tunnel |
|
| 3/100 Canopy Model |
Visual Flow Checks
(Low Speed) |
N.A.E. 9.84" x 13.11"
Water Tunnel |
| |
|
|
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(c) Engine Duct Model |
|
| 6/10 Duct Model |
Flow, Efficiency and Air Bleed Tests |
Orenda Test Cell |
| |
|
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(d) Free Flight Models |
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1/8 Scale Free Flight Models
(11 Models) |
Drag and Stability (Supersonic) |
C.A.R.D.E. Range, Ontario (9) and
Langley Field Range, Virginia (2) |
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(e) Antenna Research |
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1/48, 1/18, 1/8, 1/10, .07 and
Full Scale Models |
Antenna & Antenna Pattern Research |
Sinclair Radio Labs. Ltd. |
Ground and Taxi Trials
Engine run up trials were conducted in RL201, which was anchored to the
ground with two long poles. The two Pratt & Whitney J-75 engines
produced 36,000 lbs of thrust with afterburners on!
Taxi trials began on 24 December 1957. Runway 32/14 was used for the first
trials testing various speeds, braking, pars-braking and nose lifts.
During taxi trials it was discovered that the brakes would heat up, transferring
heat to the wheel hub and rim and eventually exploding the tire! The
brakes had another heat dissipating plate added. The para-brake functioned
with the main wheel brakes so that the aircraft did not exceed heating
limits of the brakes. Taxi trials were held at night,
Iroquois Engine Testing on a B-47
(coming soon)
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E-mail: va3kgb at symbol rac.ca
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Copyright ©
1997-2007 CJ Chapman, VA3KGB
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